latest

Makefile

@@ -16,3 +16,9 @@ test:
 examples:
 	test -d bin || mkdir bin
 	go build -o bin/ ./examples/...
+
+lint:
+	golangci-lint run
+
+fmt:
+	go fmt ./...

card.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	"github.com/logrusorgru/aurora/v4"
+	aurora "github.com/logrusorgru/aurora/v4"
 )
 
 type Card struct {
@@ -19,55 +19,52 @@ func NewCardFromString(card string) (Card, error) {
 	// FIXME extend this later to common format strings like "9s"
 	length := utf8.RuneCountInString(card)
 	if length != 2 {
-		return Card{}, fmt.Errorf("Invalid card string %s", card)
-	}
-	var rank Rank
-	var suit Suit
-	if strings.ContainsRune(card, rune(SPADE)) {
-		suit = Suit(SPADE)
-	} else if strings.ContainsRune(card, rune(HEART)) {
-		suit = Suit(HEART)
-	} else if strings.ContainsRune(card, rune(DIAMOND)) {
-		suit = Suit(DIAMOND)
-	} else if strings.ContainsRune(card, rune(CLUB)) {
-		suit = Suit(CLUB)
-	} else {
-		return Card{}, fmt.Errorf("Invalid card string %s", card)
+		return Card{}, fmt.Errorf("invalid card string %s, must be 2 characters", card)
 	}
 
-	if strings.ContainsRune(card, rune(DEUCE)) {
-		rank = Rank(DEUCE)
-	} else if strings.ContainsRune(card, rune(THREE)) {
-		rank = Rank(THREE)
-	} else if strings.ContainsRune(card, rune(FOUR)) {
-		rank = Rank(FOUR)
-	} else if strings.ContainsRune(card, rune(FIVE)) {
-		rank = Rank(FIVE)
-	} else if strings.ContainsRune(card, rune(SIX)) {
-		rank = Rank(SIX)
-	} else if strings.ContainsRune(card, rune(SEVEN)) {
-		rank = Rank(SEVEN)
-	} else if strings.ContainsRune(card, rune(EIGHT)) {
-		rank = Rank(EIGHT)
-	} else if strings.ContainsRune(card, rune(NINE)) {
-		rank = Rank(NINE)
-	} else if strings.ContainsRune(card, rune(TEN)) {
-		rank = Rank(TEN)
-	} else if strings.ContainsRune(card, rune(JACK)) {
-		rank = Rank(JACK)
-	} else if strings.ContainsRune(card, rune(QUEEN)) {
-		rank = Rank(QUEEN)
-	} else if strings.ContainsRune(card, rune(KING)) {
-		rank = Rank(KING)
-	} else if strings.ContainsRune(card, rune(ACE)) {
-		rank = Rank(ACE)
-	} else {
-		return Card{}, fmt.Errorf("Invalid card string %s", card)
+	rankMap := map[rune]Rank{
+		rune(DEUCE): DEUCE,
+		rune(THREE): THREE,
+		rune(FOUR):  FOUR,
+		rune(FIVE):  FIVE,
+		rune(SIX):   SIX,
+		rune(SEVEN): SEVEN,
+		rune(EIGHT): EIGHT,
+		rune(NINE):  NINE,
+		rune(TEN):   TEN,
+		rune(JACK):  JACK,
+		rune(QUEEN): QUEEN,
+		rune(KING):  KING,
+		rune(ACE):   ACE,
+	}
+
+	suitMap := map[rune]Suit{
+		rune(SPADE):   SPADE,
+		rune(HEART):   HEART,
+		rune(DIAMOND): DIAMOND,
+		rune(CLUB):    CLUB,
+	}
+
+	var rank Rank
+	var suit Suit
+	for r := range rankMap {
+		if strings.ContainsRune(card, r) {
+			rank = rankMap[r]
+			break
+		}
+	}
+
+	for s := range suitMap {
+		if strings.ContainsRune(card, s) {
+			suit = suitMap[s]
+			break
+		}
 	}
 
 	if rank == Rank(0) || suit == Suit(0) {
-		return Card{}, fmt.Errorf("Invalid card string %s", card)
+		return Card{}, fmt.Errorf("invalid card string %s", card)
 	}
+
 	return Card{Rank: rank, Suit: suit}, nil
 }
 
@@ -75,18 +72,17 @@ func NewCardsFromString(cards string) (Cards, error) {
 	// supports a string like 9♠,9♣,Q♥,Q♦,K♣
 	// FIXME extend this later to common format strings like "9c Qh Qd Kc"
 	// with or without commas
-	var newCards Cards
-	newCards = make(Cards, 0)
 	cardStrings := strings.Split(cards, ",")
-	for _, cardString := range cardStrings {
+	newCards := make(Cards, len(cardStrings))
+	for i, cardString := range cardStrings {
 		card, err := NewCardFromString(cardString)
 		if err != nil {
-			return Cards{}, err
+			return nil, err
 		}
-		newCards = append(newCards, card)
+		newCards[i] = card
 	}
 	if len(newCards) == 0 {
-		return Cards{}, fmt.Errorf("No cards found in string %s", cards)
+		return nil, fmt.Errorf("no cards found in string %s", cards)
 	}
 	return newCards, nil
 }
@@ -97,42 +93,41 @@ func (c *Card) String() string {
 
 type Cards []Card
 
-func (c Cards) First() Card {
-	return c[0]
+func (cards Cards) First() Card {
+	return cards[0]
 }
 
-func (c Cards) Second() Card {
-	return c[1]
+func (cards Cards) Second() Card {
+	return cards[1]
 }
 
-func (c Cards) Third() Card {
-	return c[2]
+func (cards Cards) Third() Card {
+	return cards[2]
 }
 
-func (c Cards) Fourth() Card {
-	return c[3]
+func (cards Cards) Fourth() Card {
+	return cards[3]
 }
 
-func (c Cards) Fifth() Card {
-	return c[4]
+func (cards Cards) Fifth() Card {
+	return cards[4]
 }
 
-func (c Cards) Last() Card {
-	return c[len(c)-1]
+func (cards Cards) Last() Card {
+	return cards[len(cards)-1]
 }
 
-func (c Cards) SortByRankAscending() Cards {
-	newCards := make(Cards, len(c))
-	copy(newCards, c)
-	sort.Slice(newCards, func(i, j int) bool {
-		return newCards[i].Rank.Score() < newCards[j].Rank.Score()
+func (cards Cards) SortByRankAscending() Cards {
+	sortedCards := make(Cards, len(cards))
+	copy(sortedCards, cards)
+	sort.Slice(sortedCards, func(i, j int) bool {
+		return sortedCards[i].Rank.Score() < sortedCards[j].Rank.Score()
 	})
-
-	return newCards
+	return sortedCards
 }
 
-func (c Cards) PrintToTerminal() {
-	fmt.Printf("%s", c.FormatForTerminal())
+func (cards Cards) PrintToTerminal() {
+	fmt.Printf("%s", cards.FormatForTerminal())
 }
 
 type SortOrder int
@@ -142,18 +137,18 @@ const (
 	AceHighDescending
 )
 
-func (c Cards) FormatForTerminalSorted(order SortOrder) string {
-	sorted := c.SortByRankAscending() // this is ascending
+func (cards Cards) FormatForTerminalSorted(order SortOrder) string {
+	sorted := cards.SortByRankAscending() // this is ascending
 	if order == AceHighDescending {
 		slices.Reverse(sorted)
 	}
 	return sorted.FormatForTerminal()
 }
 
-func (c Cards) FormatForTerminal() string {
+func (cards Cards) FormatForTerminal() string {
 	var cardstrings []string
-	for i := 0; i < len(c); i++ {
-		cardstrings = append(cardstrings, c[i].FormatForTerminal())
+	for i := 0; i < len(cards); i++ {
+		cardstrings = append(cardstrings, cards[i].FormatForTerminal())
 	}
 	return strings.Join(cardstrings, ",")
 }
@@ -178,16 +173,15 @@ func (c Card) FormatForTerminal() string {
 	return fmt.Sprintf("%s%s", rank, suit)
 }
 
-func (c Cards) HighestRank() Rank {
-	sorted := c.SortByRankAscending()
+func (cards Cards) HighestRank() Rank {
+	sorted := cards.SortByRankAscending()
 	return sorted[len(sorted)-1].Rank
 }
 
-func (s Cards) String() (output string) {
+func (cards Cards) String() string {
 	var cardstrings []string
-	for i := 0; i < len(s); i++ {
-		cardstrings = append(cardstrings, s[i].String())
+	for i := 0; i < len(cards); i++ {
+		cardstrings = append(cardstrings, cards[i].String())
 	}
-	output = strings.Join(cardstrings, ",")
-	return output
+	return strings.Join(cardstrings, ",")
 }

examples/flip/main.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"fmt"
+
+	"git.eeqj.de/sneak/pokercore"
+)
+
+var playerCount = 2
+
+type Player struct {
+	Hand       pokercore.Cards
+	ScoredHand *pokercore.PokerHand
+	Position   int
+}
+
+type Game struct {
+	Deck      *pokercore.Deck
+	Players   []*Player
+	Community pokercore.Cards
+	Street    int
+}
+
+func NewGame() *Game {
+	g := &Game{}
+	g.Street = 0
+	g.Deck = pokercore.NewDeck()
+	g.Deck.ShuffleRandomly()
+	return g
+}
+
+func (g *Game) StreetAsString() string {
+	switch g.Street {
+	case 0:
+		return "pre-flop"
+	case 1:
+		return "flop"
+	case 2:
+		return "turn"
+	case 3:
+		return "river"
+	}
+	return "unknown"
+}
+
+func (g *Game) DealPlayersIn() {
+	for i := 0; i < playerCount; i++ {
+		p := Player{Hand: g.Deck.Deal(2), Position: i + 1}
+		g.Players = append(g.Players, &p)
+	}
+}
+
+func (g *Game) ShowGameStatus() {
+	fmt.Printf("Street: %s\n", g.StreetAsString())
+	fmt.Printf("Community cards: %s\n", g.Community.FormatForTerminal())
+	for _, p := range g.Players {
+		if p != nil {
+			fmt.Printf("Player %d: %s\n", p.Position, p.Hand.FormatForTerminal())
+			if g.Street > 0 {
+				ac := append(p.Hand, g.Community...)
+				ph, err := ac.PokerHand()
+				if err != nil {
+					panic(err)
+				}
+				fmt.Printf("Player %d has %s\n", p.Position, ph.Description())
+				fmt.Printf("Player %d Score: %d\n", p.Position, ph.Score)
+			}
+		}
+	}
+}
+
+func (g *Game) DealFlop() {
+	g.Community = g.Deck.Deal(3)
+	g.Street = 1
+}
+
+func (g *Game) DealTurn() {
+	g.Community = append(g.Community, g.Deck.Deal(1)...)
+	g.Street = 2
+}
+
+func (g *Game) DealRiver() {
+	g.Community = append(g.Community, g.Deck.Deal(1)...)
+	g.Street = 3
+}
+
+func (g *Game) ShowWinner() {
+	var winner *Player
+	var winningHand *pokercore.PokerHand
+	for _, p := range g.Players {
+		if p != nil {
+			ac := append(p.Hand, g.Community...)
+			ph, err := ac.PokerHand()
+			if err != nil {
+				panic(err)
+			}
+			if winner == nil {
+				winner = p
+				winningHand = ph
+			} else {
+				if ph.Score > winningHand.Score {
+					winner = p
+					winningHand = ph
+				}
+			}
+		}
+	}
+	fmt.Printf("Winner: Player %d with %s.\n", winner.Position, winningHand.Description())
+}
+
+func main() {
+	g := NewGame()
+	g.DealPlayersIn()
+	g.DealFlop()
+	g.DealTurn()
+	g.DealRiver()
+	g.ShowGameStatus()
+	g.ShowWinner()
+}

examples/montecarlo/main.go

@@ -0,0 +1,155 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/rcrowley/go-metrics"
+	"github.com/schollz/progressbar/v3"
+	"sneak.berlin/go/pokercore"
+)
+
+var gameCount = 50_000
+var playerCount = 2
+
+type Player struct {
+	Hand       pokercore.Cards
+	ScoredHand *pokercore.PokerHand
+	Position   int
+}
+
+type Game struct {
+	Deck      *pokercore.Deck
+	Players   []*Player
+	Community pokercore.Cards
+	Street    int
+}
+
+func NewGame() *Game {
+	g := &Game{}
+	g.Street = 0
+	g.Deck = pokercore.NewDeck()
+	g.Deck.ShuffleRandomly()
+	return g
+}
+
+func (g *Game) StreetAsString() string {
+	switch g.Street {
+	case 0:
+		return "pre-flop"
+	case 1:
+		return "flop"
+	case 2:
+		return "turn"
+	case 3:
+		return "river"
+	}
+	return "unknown"
+}
+
+func (g *Game) DealPlayersIn() {
+	for i := 0; i < playerCount; i++ {
+		p := Player{Hand: g.Deck.Deal(2), Position: i + 1}
+		g.Players = append(g.Players, &p)
+	}
+}
+
+func (g *Game) DealFlop() {
+	g.Community = g.Deck.Deal(3)
+	g.Street = 1
+}
+
+func (g *Game) DealTurn() {
+	g.Community = append(g.Community, g.Deck.Deal(1)...)
+	g.Street = 2
+}
+
+func (g *Game) DealRiver() {
+	g.Community = append(g.Community, g.Deck.Deal(1)...)
+	g.Street = 3
+}
+
+func (g *Game) ShowWinner() int {
+	var winner *Player
+	var winningHand *pokercore.PokerHand
+	for _, p := range g.Players {
+		if p != nil {
+			ac := append(p.Hand, g.Community...)
+			ph, err := ac.PokerHand()
+			if err != nil {
+				panic(err)
+			}
+			if winner == nil {
+				winner = p
+				winningHand = ph
+			} else {
+				if ph.Score > winningHand.Score {
+					winner = p
+					winningHand = ph
+				}
+			}
+		}
+	}
+	return winner.Position
+}
+
+func main() {
+	oneWins := 0
+	twoWins := 0
+
+	registry := metrics.NewRegistry()
+	timer := metrics.NewTimer()
+	registry.Register("pokerGame", timer)
+
+	bar := progressbar.NewOptions(
+		gameCount,
+		progressbar.OptionSetDescription("Gambling..."),
+		progressbar.OptionShowCount(),
+		progressbar.OptionShowIts(),
+		progressbar.OptionSetPredictTime(true),
+		progressbar.OptionClearOnFinish(),
+		progressbar.OptionThrottle(
+			100*time.Millisecond,
+		), // Update every 100ms
+	)
+
+	for i := 0; i < gameCount; i++ {
+		start := time.Now()
+		w := runFlip()
+		duration := time.Since(start)
+		timer.Update(duration)
+		bar.Add(1)
+		if w == 1 {
+			oneWins++
+		} else {
+			twoWins++
+		}
+	}
+
+	fmt.Printf("%d games played\n", gameCount)
+	fmt.Printf("Min: %d ns\n", timer.Min())
+	fmt.Printf("Max: %d ns\n", timer.Max())
+	fmt.Printf("Mean: %0.2f ns\n", timer.Mean())
+	fmt.Printf("StdDev: %0.2f ns\n", timer.StdDev())
+	fmt.Printf(
+		"Percentiles: 50%%: %0.2f ns, 75%%: %0.2f ns, 95%%: %0.2f ns, 99%%: %0.2f ns\n",
+		timer.Percentile(0.50),
+		timer.Percentile(0.75),
+		timer.Percentile(0.95),
+		timer.Percentile(0.99),
+	)
+	oneWinPercentage := float64(oneWins) / float64(gameCount) * 100
+	twoWinPercentage := float64(twoWins) / float64(gameCount) * 100
+	fmt.Printf("Player 1 won: %d (%0.2f%%)\n", oneWins, oneWinPercentage)
+	fmt.Printf("Player 2 won: %d (%0.2f%%)\n", twoWins, twoWinPercentage)
+}
+
+func runFlip() int {
+	g := NewGame()
+	g.DealPlayersIn()
+	g.DealFlop()
+	g.DealTurn()
+	g.DealRiver()
+	winnerPosition := g.ShowWinner()
+	return winnerPosition
+}

examples/sf/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+
+	"sneak.berlin/go/pokercore"
+)
+
+func main() {
+	var sfp bool
+	var tries int
+	var found int
+
+	const maxTries = 100_000_000
+
+	for i := 0; i < maxTries; i++ {
+		sfp = searchStraightFlush()
+		if sfp {
+			found++
+		}
+		tries++
+		if tries%1000 == 0 {
+			fmt.Printf("Tries: %d, Found: %d\n", tries, found)
+		}
+	}
+	fmt.Printf("Tries: %d, Found: %d\n", tries, found)
+}
+
+func searchStraightFlush() bool {
+
+	d := pokercore.NewDeck()
+
+	d.ShuffleRandomly()
+
+	var hand pokercore.Cards
+
+	hand = d.Deal(7)
+
+	ph, err := hand.PokerHand()
+
+	if err != nil {
+		fmt.Println("Error: ", err)
+		return false
+	}
+
+	if ph.Type == pokercore.StraightFlush ||
+		ph.Type == pokercore.RoyalFlush {
+		fmt.Println("straight flush found")
+		fmt.Println("Hand: ", hand.FormatForTerminal())
+		fmt.Println("PokerHand: ", ph)
+		return true
+	}
+
+	return false
+
+}

go.mod

@@ -1,36 +1,23 @@
-module git.eeqj.de/sneak/pokercore
+module sneak.berlin/go/pokercore
 
 go 1.22.2
 
 require (
-	github.com/logrusorgru/aurora v2.0.3+incompatible
 	github.com/logrusorgru/aurora/v4 v4.0.0
+	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
+	github.com/schollz/progressbar/v3 v3.14.2
 	github.com/sirupsen/logrus v1.9.3
 	github.com/stretchr/testify v1.8.0
+	sneak.berlin/go/timingbench v0.0.0-20240522212031-a6243a470213
 )
 
 require (
-	git.eeqj.de/sneak/timingbench v0.0.0-20240519025145-fb13c5c56a02 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
-	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
-	github.com/google/go-cmp v0.6.0 // indirect
-	github.com/k0kubun/pp/v3 v3.2.0 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
-	github.com/nxadm/tail v1.4.8 // indirect
-	github.com/onsi/ginkgo v1.16.5 // indirect
-	github.com/onsi/gomega v1.33.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/schollz/progressbar/v3 v3.14.2 // indirect
-	golang.org/x/net v0.24.0 // indirect
 	golang.org/x/sys v0.20.0 // indirect
 	golang.org/x/term v0.20.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/tools v0.20.0 // indirect
 	gonum.org/v1/gonum v0.15.0 // indirect
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,53 +1,16 @@
-git.eeqj.de/sneak/timingbench v0.0.0-20240519025145-fb13c5c56a02 h1:b/v1EDAlsfvINIeV4znI/vH7SY7mUJOO1KWeBD+IW90=
-git.eeqj.de/sneak/timingbench v0.0.0-20240519025145-fb13c5c56a02/go.mod h1:iKAlgt/liDtXifmn7fPJK+KYMr0c4lXYFJ+j5d3gfEQ=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
-github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
-github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
-github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
-github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
-github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
-github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
-github.com/k0kubun/pp/v3 v3.2.0 h1:h33hNTZ9nVFNP3u2Fsgz8JXiF5JINoZfFq4SvKJwNcs=
-github.com/k0kubun/pp/v3 v3.2.0/go.mod h1:ODtJQbQcIRfAD3N+theGCV1m/CBxweERz2dapdz1EwA=
-github.com/logrusorgru/aurora v2.0.3+incompatible h1:tOpm7WcpBTn4fjmVfgpQq0EfczGlG91VSDkswnjF5A8=
-github.com/logrusorgru/aurora v2.0.3+incompatible/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
 github.com/logrusorgru/aurora/v4 v4.0.0 h1:sRjfPpun/63iADiSvGGjgA1cAYegEWMPCJdUpJYn9JA=
 github.com/logrusorgru/aurora/v4 v4.0.0/go.mod h1:lP0iIa2nrnT/qoFXcOZSrZQpJ1o6n2CUf/hyHi2Q4ZQ=
-github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
-github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
-github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
-github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
-github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
-github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
-github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
-github.com/onsi/ginkgo v1.16.5 h1:8xi0RTUf59SOSfEtZMvwTvXYMzG4gV23XVHOZiXNtnE=
-github.com/onsi/ginkgo v1.16.5/go.mod h1:+E8gABHa3K6zRBolWtd+ROzc/U5bkGt0FwiG042wbpU=
-github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
-github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
-github.com/onsi/gomega v1.33.1 h1:dsYjIxxSR755MDmKVsaFQTE22ChNBcuuTWgkUDSubOk=
-github.com/onsi/gomega v1.33.1/go.mod h1:U4R44UsT+9eLIaYRB2a5qajjtQYn0hauxvRm16AVYg0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 h1:N/ElC8H3+5XpJzTSTfLsJV/mx9Q9g7kxmchpfZyxgzM=
+github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/schollz/progressbar/v3 v3.14.2 h1:EducH6uNLIWsr560zSV1KrTeUb/wZGAHqyMFIEa99ks=
@@ -57,77 +20,26 @@ github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVs
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
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-github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.24.0 h1:1PcaxkF854Fu3+lvBIx5SYn9wRlBzzcnHZSiaFFAb0w=
-golang.org/x/net v0.24.0/go.mod h1:2Q7sJY5mzlzWjKtYUEXSlBWCdyaioyXzRB2RtU8KVE8=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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-golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
-golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
 golang.org/x/term v0.20.0 h1:VnkxpohqXaOBYJtBmEppKUG6mXpi+4O6purfc2+sMhw=
 golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 gonum.org/v1/gonum v0.15.0/go.mod h1:xzZVBJBtS+Mz4q0Yl2LJTk+OxOg4jiXZ7qBoM0uISGo=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
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-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+sneak.berlin/go/timingbench v0.0.0-20240522212031-a6243a470213 h1:jgfwL2lUUp6aII87vgkgFenfKftsbKvUR3jlsRdS2yo=
+sneak.berlin/go/timingbench v0.0.0-20240522212031-a6243a470213/go.mod h1:W+0S+VhiuNIU/06KPhWJCmNhMaCztg2MuHitNEVEFG0=

perf_test.go

@@ -5,11 +5,12 @@ import (
 	"testing"
 	"time"
 
-	"git.eeqj.de/sneak/timingbench"
 	"github.com/stretchr/testify/assert"
+	"sneak.berlin/go/timingbench"
 )
 
 func TestShuffleSpeed(t *testing.T) {
+	t.Parallel()
 	iterations := 1000
 	t.Logf("Running %d iterations of shuffle speed test", iterations)
 	// Create a context with a timeout for cancellation.
@@ -27,18 +28,21 @@ func TestShuffleSpeed(t *testing.T) {
 }
 
 func TestHandFindingSpeedFiveCard(t *testing.T) {
+	t.Parallel()
 	iterations := 1000
 	t.Logf("Running %d iterations of hand finding speed test for 5 card hand", iterations)
 	measureHandFinding(t, iterations, 5)
 }
 
 func TestHandFindingSpeedSevenCard(t *testing.T) {
+	t.Parallel()
 	iterations := 1000
 	t.Logf("Running %d iterations of hand finding speed test for 7 card hand", iterations)
 	measureHandFinding(t, iterations, 7)
 }
 
 func TestHandFindingSpeedNineCard(t *testing.T) {
+	t.Parallel()
 	iterations := 100
 	t.Logf("Running %d iterations of hand finding speed test for 9 card hand", iterations)
 	measureHandFinding(t, iterations, 9)

pokercore_test.go

@@ -12,6 +12,7 @@ type ShuffleTestResults []struct {
 }
 
 func TestPokerDeck(t *testing.T) {
+	t.Parallel()
 	d := NewDeck()
 	//fmt.Printf("newdeck: %+v\n", d)
 	d.ShuffleDeterministically(437)
@@ -35,6 +36,7 @@ func TestPokerDeck(t *testing.T) {
 }
 
 func TestDealing(t *testing.T) {
+	t.Parallel()
 	d := NewDeckFromCards(Cards{
 		Card{Rank: ACE, Suit: HEART},
 		Card{Rank: DEUCE, Suit: HEART},
@@ -50,6 +52,7 @@ func TestDealing(t *testing.T) {
 }
 
 func TestSpecialCaseOfFiveHighStraightFlush(t *testing.T) {
+	t.Parallel()
 	// actual bug from first implementation
 	d := NewDeckFromCards(Cards{
 		Card{Rank: ACE, Suit: HEART},
@@ -68,6 +71,7 @@ func TestSpecialCaseOfFiveHighStraightFlush(t *testing.T) {
 }
 
 func TestSpecialCaseOfFiveHighStraight(t *testing.T) {
+	t.Parallel()
 	// actual bug from first implementation
 	d := NewDeckFromCards(Cards{
 		Card{Rank: ACE, Suit: HEART},

pokerhand.go

@@ -62,13 +62,13 @@ func (c Cards) PokerHand() (*PokerHand, error) {
 	return ph, nil
 }
 
-func (ph PokerHand) ToSortedCards() Cards {
+func (ph *PokerHand) ToSortedCards() Cards {
 	// I believe ph.Hand is already sorted, but in any case it's only 5
 	// cards and sorting it costs ~nothing
 	return ph.Hand.SortByRankAscending()
 }
 
-func (ph PokerHand) Compare(other PokerHand) int {
+func (ph *PokerHand) Compare(other PokerHand) int {
 	if ph.Score > other.Score {
 		return 1
 	}
@@ -78,74 +78,74 @@ func (ph PokerHand) Compare(other PokerHand) int {
 	return 0
 }
 
-func (ph PokerHand) HighestRank() Rank {
+func (ph *PokerHand) HighestRank() Rank {
 	return ph.Hand.HighestRank()
 }
 
-func (ph PokerHand) String() string {
+func (ph *PokerHand) String() string {
 	return fmt.Sprintf("<PokerHand: %s (%s)>", ph.Hand.String(), ph.Description())
 }
 
-func (c PokerHand) Description() string {
-	if c.Type == RoyalFlush {
-		return fmt.Sprintf("a royal flush in %s", c.Hand[0].Suit)
+func (ph *PokerHand) Description() string {
+	if ph.Type == RoyalFlush {
+		return fmt.Sprintf("a royal flush in %s", ph.Hand[0].Suit)
 	}
-	if c.Hand.containsStraightFlush() {
-		if c.Hand[3].Rank == FIVE && c.Hand[4].Rank == ACE {
+	if ph.Hand.containsStraightFlush() {
+		if ph.Hand[3].Rank == FIVE && ph.Hand[4].Rank == ACE {
 			// special case for steel wheel
-			return fmt.Sprintf("%s high straight flush in %s", c.Hand[3].Rank.WithArticle(), c.Hand[4].Suit)
+			return fmt.Sprintf("%s high straight flush in %s", ph.Hand[3].Rank.WithArticle(), ph.Hand[4].Suit)
 		}
-		return fmt.Sprintf("%s high straight flush in %s", c.HighestRank().WithArticle(), c.Hand[4].Suit)
+		return fmt.Sprintf("%s high straight flush in %s", ph.HighestRank().WithArticle(), ph.Hand[4].Suit)
 	}
-	if c.Hand.containsFourOfAKind() {
-		return fmt.Sprintf("four %s with %s", c.Hand.fourOfAKindRank().Pluralize(), c.Hand.fourOfAKindKicker().Rank.WithArticle())
+	if ph.Hand.containsFourOfAKind() {
+		return fmt.Sprintf("four %s with %s", ph.Hand.fourOfAKindRank().Pluralize(), ph.Hand.fourOfAKindKicker().Rank.WithArticle())
 	}
-	if c.Hand.containsFullHouse() {
-		return fmt.Sprintf("a full house, %s full of %s", c.Hand.fullHouseTripsRank().Pluralize(), c.Hand.fullHousePairRank().Pluralize())
+	if ph.Hand.containsFullHouse() {
+		return fmt.Sprintf("a full house, %s full of %s", ph.Hand.fullHouseTripsRank().Pluralize(), ph.Hand.fullHousePairRank().Pluralize())
 	}
-	if c.Hand.containsFlush() {
-		return fmt.Sprintf("%s high flush in %s", c.HighestRank().WithArticle(), c.Hand[4].Suit)
+	if ph.Hand.containsFlush() {
+		return fmt.Sprintf("%s high flush in %s", ph.HighestRank().WithArticle(), ph.Hand[4].Suit)
 	}
-	if c.Hand.containsStraight() {
-		if c.Hand[3].Rank == FIVE && c.Hand[4].Rank == ACE {
+	if ph.Hand.containsStraight() {
+		if ph.Hand[3].Rank == FIVE && ph.Hand[4].Rank == ACE {
 			// special case for wheel straight
-			return fmt.Sprintf("%s high straight", c.Hand[3].Rank.WithArticle())
+			return fmt.Sprintf("%s high straight", ph.Hand[3].Rank.WithArticle())
 		}
-		return fmt.Sprintf("%s high straight", c.HighestRank().WithArticle())
+		return fmt.Sprintf("%s high straight", ph.HighestRank().WithArticle())
 	}
-	if c.Hand.containsThreeOfAKind() {
+	if ph.Hand.containsThreeOfAKind() {
 		return fmt.Sprintf(
 			"three %s with %s and %s",
-			c.Hand.threeOfAKindTripsRank().Pluralize(),
-			c.Hand.threeOfAKindFirstKicker().Rank.WithArticle(),
-			c.Hand.threeOfAKindSecondKicker().Rank.WithArticle(),
+			ph.Hand.threeOfAKindTripsRank().Pluralize(),
+			ph.Hand.threeOfAKindFirstKicker().Rank.WithArticle(),
+			ph.Hand.threeOfAKindSecondKicker().Rank.WithArticle(),
 		)
 	}
-	if c.Hand.containsTwoPair() {
+	if ph.Hand.containsTwoPair() {
 		return fmt.Sprintf(
 			"two pair, %s and %s with %s",
-			c.Hand.twoPairBiggestPair().Pluralize(),
-			c.Hand.twoPairSmallestPair().Pluralize(),
-			c.Hand.twoPairKicker().Rank.WithArticle(),
+			ph.Hand.twoPairBiggestPair().Pluralize(),
+			ph.Hand.twoPairSmallestPair().Pluralize(),
+			ph.Hand.twoPairKicker().Rank.WithArticle(),
 		)
 	}
-	if c.Hand.containsPair() {
+	if ph.Hand.containsPair() {
 		return fmt.Sprintf(
 			"a pair of %s with %s, %s, and %s",
-			c.Hand.pairRank().Pluralize(),
-			c.Hand.pairFirstKicker().Rank.WithArticle(),
-			c.Hand.pairSecondKicker().Rank.WithArticle(),
-			c.Hand.pairThirdKicker().Rank.WithArticle(),
+			ph.Hand.pairRank().Pluralize(),
+			ph.Hand.pairFirstKicker().Rank.WithArticle(),
+			ph.Hand.pairSecondKicker().Rank.WithArticle(),
+			ph.Hand.pairThirdKicker().Rank.WithArticle(),
 		)
 	}
 
 	return fmt.Sprintf(
 		// "ace high with an eight, a seven, a six, and a deuce"
 		"%s high with %s, %s, %s, and %s",
-		c.Hand[4].Rank,
-		c.Hand[3].Rank.WithArticle(),
-		c.Hand[2].Rank.WithArticle(),
-		c.Hand[1].Rank.WithArticle(),
-		c.Hand[0].Rank.WithArticle(),
+		ph.Hand[4].Rank,
+		ph.Hand[3].Rank.WithArticle(),
+		ph.Hand[2].Rank.WithArticle(),
+		ph.Hand[1].Rank.WithArticle(),
+		ph.Hand[0].Rank.WithArticle(),
 	)
 }

scoring.go

@@ -142,5 +142,4 @@ func (ph *PokerHand) calculateScore() {
 	ph.Score += ph.Hand[2].Score()
 	ph.Score += ph.Hand[3].Score()
 	ph.Score += ph.Hand[4].Score()
-	return
 }

scoring_test.go

@@ -6,16 +6,16 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestHandDescripionBug(t *testing.T) {
+func TestHandDescriptionBug(t *testing.T) {
+	t.Parallel()
 	playerCount := 8
 	d := NewDeck()
 	d.ShuffleDeterministically(1337)
-	var players []*Cards
-	players = make([]*Cards, playerCount)
-	for i := 1; i-1 < playerCount; i++ {
+	players := make([]*Cards, playerCount)
+	for i := 0; i < playerCount; i++ {
 		c := d.Deal(2)
-		players[i-1] = &c
-		t.Logf("Player %d dealt: %+v\n", i, c)
+		players[i] = &c
+		t.Logf("Player %d dealt: %+v\n", i+1, c)
 	}
 	t.Logf("Players: %+v\n", players)
 
@@ -24,17 +24,17 @@ func TestHandDescripionBug(t *testing.T) {
 
 	var playerResults []*PokerHand
 
-	for i := 1; i-1 < playerCount; i++ {
-		t.Logf("Player %d hole cards: %+v\n", i, *players[i-1])
-		pc := append(*players[i-1], community...)
-		t.Logf("Player %d cards available: %+v\n", i, pc)
+	for i := 0; i < playerCount; i++ {
+		t.Logf("Player %d hole cards: %+v\n", i+1, *players[i])
+		pc := append(*players[i], community...)
+		t.Logf("Player %d cards available: %+v\n", i+1, pc)
 		hand, err := pc.IdentifyBestFiveCardPokerHand()
-		assert.Nil(t, err, "Expected no error")
+		assert.NoError(t, err, "Expected no error")
 		ph, err := hand.PokerHand()
-		assert.Nil(t, err, "Expected no error")
-		t.Logf("Player %d five cards used: %+v\n", i, hand)
-		t.Logf("Player %d poker hand: %+v\n", i, ph)
-		t.Logf("Player %d best hand description: %s\n", i, ph.Description())
+		assert.NoError(t, err, "Expected no error")
+		t.Logf("Player %d five cards used: %+v\n", i+1, hand)
+		t.Logf("Player %d poker hand: %+v\n", i+1, ph)
+		t.Logf("Player %d best hand description: %s\n", i+1, ph.Description())
 		playerResults = append(playerResults, ph)
 	}
 
@@ -44,347 +44,380 @@ func TestHandDescripionBug(t *testing.T) {
 	t.Logf("Weird one description: %s\n", weirdOne.Description())
 
 	// T♠,7♠,9♦,7♣,T♥
-	assert.Equal(t, weirdOne.Description(), "two pair, tens and sevens with a nine")
+	assert.Equal(t, "two pair, tens and sevens with a nine", weirdOne.Description())
 
 	scoreShouldBe := ScoreTwoPair
 	scoreShouldBe += 10000 * TEN.Score()
 	scoreShouldBe += 100 * SEVEN.Score()
 	scoreShouldBe += NINE.Score()
-	assert.Equal(t, weirdOne.Score, scoreShouldBe)
+	assert.Equal(t, scoreShouldBe, weirdOne.Score)
 
 	cards := weirdOne.Hand
 
 	assert.True(t, cards.containsTwoPair(), "Expected hand to be two pair")
 
 	bp := cards.twoPairBiggestPair() // returns Rank, because describing a pair
-	assert.Equal(t, bp, TEN, "Expected biggest pair to be a ten")
+	assert.Equal(t, TEN, bp, "Expected biggest pair to be a ten")
 
 	sp := cards.twoPairSmallestPair() // returns Rank, because describing a pair
-	assert.Equal(t, sp, SEVEN, "Expected smallest pair to be a seven")
+	assert.Equal(t, SEVEN, sp, "Expected smallest pair to be a seven")
 
 	k := cards.twoPairKicker() // returns Card, because describing a single card
-	assert.Equal(t, k.Rank, NINE, "Expected kicker to be a nine")
-
+	assert.Equal(t, NINE, k.Rank, "Expected kicker to be a nine")
 }
 
 func TestAceLowStraight(t *testing.T) {
-	hand := Cards{
-		AceOfSpades(),
-		DeuceOfHearts(),
-		ThreeOfDiamonds(),
-		FourOfClubs(),
-		FiveOfSpades(),
-	}
-	assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
-	ph, err := hand.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	assert.Greater(t, ph.Score, 0, "Expected score to be greater than 0")
-	assert.Less(t, ph.Score, 100000000000000000, "Expected score to be less than 100000000000000000")
-	assert.Equal(t, ph.Score, ScoreStraight+FIVE.Score())
-	assert.Equal(t, ph.Description(), "a five high straight")
-	assert.True(t, hand.HighestRank() == ACE, "Expected highest rank to be an ace")
-	s := hand.SortByRankAscending()
-	assert.True(t, s.First().Rank == DEUCE, "Expected first card to be a deuce")
-	assert.True(t, s.Last().Rank == ACE, "Expected last card in sorted to be a ace")
-	assert.True(t, s.Second().Rank == THREE, "Expected second card to be a three")
-	assert.True(t, s.Third().Rank == FOUR, "Expected third card to be a four")
-	assert.True(t, s.Fourth().Rank == FIVE, "Expected fourth card to be a five")
-	assert.True(t, s.Fifth().Rank == ACE, "Expected fifth card to be an ace")
+	t.Parallel()
+	t.Run("Test Ace-Low Straight", func(t *testing.T) {
+		hand := Cards{
+			AceOfSpades(),
+			DeuceOfHearts(),
+			ThreeOfDiamonds(),
+			FourOfClubs(),
+			FiveOfSpades(),
+		}
+		assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
+		ph, err := hand.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		assert.Greater(t, ph.Score, 0, "Expected score to be greater than 0")
+		assert.Less(t, ph.Score, 100000000000000000, "Expected score to be less than 100000000000000000")
+		assert.Equal(t, ph.Score, ScoreStraight+FIVE.Score())
+		assert.Equal(t, "a five high straight", ph.Description())
+		assert.Equal(t, ACE, hand.HighestRank(), "Expected highest rank to be an ace")
+		s := hand.SortByRankAscending()
+		assert.Equal(t, DEUCE, s.First().Rank, "Expected first card to be a deuce")
+		assert.Equal(t, ACE, s.Last().Rank, "Expected last card in sorted to be an ace")
+		assert.Equal(t, THREE, s.Second().Rank, "Expected second card to be a three")
+		assert.Equal(t, FOUR, s.Third().Rank, "Expected third card to be a four")
+		assert.Equal(t, FIVE, s.Fourth().Rank, "Expected fourth card to be a five")
+		assert.Equal(t, ACE, s.Fifth().Rank, "Expected fifth card to be an ace")
+	})
 }
 
 func TestAceHighStraight(t *testing.T) {
-	hand := Cards{
-		TenOfSpades(),
-		JackOfHearts(),
-		KingOfClubs(),
-		AceOfSpades(),
-		QueenOfDiamonds(),
-	}
+	t.Parallel()
+	t.Run("Test Ace-High Straight", func(t *testing.T) {
+		hand := Cards{
+			TenOfSpades(),
+			JackOfHearts(),
+			KingOfClubs(),
+			AceOfSpades(),
+			QueenOfDiamonds(),
+		}
 
-	assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
-	newDeck := NewDeckFromCards(hand)
-	newDeck.ShuffleDeterministically(123456789)
-	shuffledHand := newDeck.Deal(5)
-	assert.True(t, shuffledHand.containsStraight(), "Expected hand to still be a straight after shuffle")
-	assert.True(t, shuffledHand.HighestRank() == ACE, "Expected highest rank to be an ace")
-	sortedHand := shuffledHand.SortByRankAscending()
-	assert.True(t, sortedHand[0].Rank == TEN, "Expected lowest rank to be a ten")
-	assert.True(t, sortedHand[1].Rank == JACK, "Expected second lowest rank to be a jack")
-	assert.True(t, sortedHand[2].Rank == QUEEN, "Expected third lowest rank to be a queen")
-	assert.True(t, sortedHand[3].Rank == KING, "Expected fourth lowest rank to be a king")
-	assert.True(t, sortedHand[4].Rank == ACE, "Expected highest rank to be an ace")
+		assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
+		newDeck := NewDeckFromCards(hand)
+		newDeck.ShuffleDeterministically(123456789)
+		shuffledHand := newDeck.Deal(5)
+		assert.True(t, shuffledHand.containsStraight(), "Expected hand to still be a straight after shuffle")
+		assert.Equal(t, ACE, shuffledHand.HighestRank(), "Expected highest rank to be an ace")
+		sortedHand := shuffledHand.SortByRankAscending()
+		assert.Equal(t, TEN, sortedHand[0].Rank, "Expected lowest rank to be a ten")
+		assert.Equal(t, JACK, sortedHand[1].Rank, "Expected second lowest rank to be a jack")
+		assert.Equal(t, QUEEN, sortedHand[2].Rank, "Expected third lowest rank to be a queen")
+		assert.Equal(t, KING, sortedHand[3].Rank, "Expected fourth lowest rank to be a king")
+		assert.Equal(t, ACE, sortedHand[4].Rank, "Expected highest rank to be an ace")
+	})
 }
 
 func TestOtherStraight(t *testing.T) {
-	hand := Cards{
-		DeuceOfSpades(),
-		ThreeOfHearts(),
-		FourOfDiamonds(),
-		FiveOfClubs(),
-		SixOfSpades(),
-	}
-	assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
+	t.Parallel()
+	t.Run("Test Other Straight", func(t *testing.T) {
+		hand := Cards{
+			DeuceOfSpades(),
+			ThreeOfHearts(),
+			FourOfDiamonds(),
+			FiveOfClubs(),
+			SixOfSpades(),
+		}
+		assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
 
-	newDeck := NewDeckFromCards(hand)
-	newDeck.ShuffleDeterministically(123456789)
-	//fmt.Printf("Shuffled deck: %s\n", newDeck.String())
-	//fmt.Printf("new deck has %d cards\n", newDeck.Count())
-	shuffledHand := newDeck.Deal(5)
-	assert.True(t, shuffledHand.containsStraight(), "Expected hand to still be a straight after shuffle")
-	assert.False(t, shuffledHand.containsTwoPair(), "Expected hand to not be two pair")
-	assert.False(t, shuffledHand.containsPair(), "Expected hand to not be a pair")
-	assert.True(t, shuffledHand.HighestRank() == SIX, "Expected highest rank to be a six")
-	assert.True(t, shuffledHand.SortByRankAscending().First().Rank == DEUCE, "Expected first card to be a deuce")
+		newDeck := NewDeckFromCards(hand)
+		newDeck.ShuffleDeterministically(123456789)
+		shuffledHand := newDeck.Deal(5)
+		assert.True(t, shuffledHand.containsStraight(), "Expected hand to still be a straight after shuffle")
+		assert.False(t, shuffledHand.containsTwoPair(), "Expected hand to not be two pair")
+		assert.False(t, shuffledHand.containsPair(), "Expected hand to not be a pair")
+		assert.Equal(t, SIX, shuffledHand.HighestRank(), "Expected highest rank to be a six")
+		assert.Equal(t, DEUCE, shuffledHand.SortByRankAscending().First().Rank, "Expected first card to be a deuce")
+	})
 }
 
 func TestFlush(t *testing.T) {
-	hand := Cards{
-		AceOfSpades(),
-		DeuceOfSpades(),
-		ThreeOfSpades(),
-		FourOfSpades(),
-		SixOfSpades(),
-	}
-	assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
-	newDeck := NewDeckFromCards(hand)
-	newDeck.ShuffleDeterministically(123456789)
-	//fmt.Printf("Shuffled deck: %s\n", newDeck.String())
-	//fmt.Printf("new deck has %d cards\n", newDeck.Count())
-	shuffledHand := newDeck.Deal(5)
-	assert.True(t, shuffledHand.containsFlush(), "Expected hand to still be a flush after shuffle")
+	t.Parallel()
+	t.Run("Test Flush", func(t *testing.T) {
+		hand := Cards{
+			AceOfSpades(),
+			DeuceOfSpades(),
+			ThreeOfSpades(),
+			FourOfSpades(),
+			SixOfSpades(),
+		}
+		assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
+		newDeck := NewDeckFromCards(hand)
+		newDeck.ShuffleDeterministically(123456789)
+		shuffledHand := newDeck.Deal(5)
+		assert.True(t, shuffledHand.containsFlush(), "Expected hand to still be a flush after shuffle")
 
-	// flush value is the sum of the ranks, just like high card
-	x := ScoreFlush
-	x += ACE.Score()
-	x += DEUCE.Score()
-	x += THREE.Score()
-	x += FOUR.Score()
-	x += SIX.Score()
-	//fmt.Printf("a-2-3-4-6 flush score should be: %d\n", x)
+		// flush value is the sum of the ranks, just like high card
+		x := ScoreFlush
+		x += ACE.Score()
+		x += DEUCE.Score()
+		x += THREE.Score()
+		x += FOUR.Score()
+		x += SIX.Score()
 
-	ph, err := shuffledHand.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	assert.Greater(t, ph.Score, 0, "Expected score to be nonzero 0")
-	assert.Equal(t, ph.Score, x)
+		ph, err := shuffledHand.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		assert.Greater(t, ph.Score, 0, "Expected score to be nonzero")
+		assert.Equal(t, ph.Score, x)
+	})
 }
 
 func TestStraightFlush(t *testing.T) {
-	hand := Cards{
-		SixOfSpades(),
-		DeuceOfSpades(),
-		ThreeOfSpades(),
-		FourOfSpades(),
-		FiveOfSpades(),
-	}
-	assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
-	assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
-	assert.True(t, hand.containsStraightFlush(), "Expected hand to be a straight flush")
-	assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
-	assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
-	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
-	assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
-	assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
-	assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
+	t.Parallel()
+	t.Run("Test Straight Flush", func(t *testing.T) {
+		hand := Cards{
+			SixOfSpades(),
+			DeuceOfSpades(),
+			ThreeOfSpades(),
+			FourOfSpades(),
+			FiveOfSpades(),
+		}
+		assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
+		assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
+		assert.True(t, hand.containsStraightFlush(), "Expected hand to be a straight flush")
+		assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
+		assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
+		assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+		assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
+		assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
+		assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
 
-	assert.True(t, hand.HighestRank() == SIX, "Expected highest rank to be a six")
+		assert.Equal(t, SIX, hand.HighestRank(), "Expected highest rank to be a six")
 
-	nd := NewDeckFromCards(hand)
-	nd.ShuffleDeterministically(123456789)
-	//fmt.Printf("Shuffled deck: %s\n", nd.String())
-	//fmt.Printf("new deck has %d cards\n", nd.Count())
-	shuffledHand := nd.Deal(5)
-	assert.True(t, shuffledHand.containsStraightFlush(), "Expected hand to still be a straight flush after shuffle")
-	assert.True(t, shuffledHand.HighestRank() == SIX, "Expected highest rank to still be a six after shuffle")
-	assert.True(t, shuffledHand.HighestRank() == SIX, "Expected highest rank to be a six after shuffle even with aces low")
+		nd := NewDeckFromCards(hand)
+		nd.ShuffleDeterministically(123456789)
+		shuffledHand := nd.Deal(5)
+		assert.True(t, shuffledHand.containsStraightFlush(), "Expected hand to still be a straight flush after shuffle")
+		assert.Equal(t, SIX, shuffledHand.HighestRank(), "Expected highest rank to still be a six after shuffle")
+		assert.Equal(t, SIX, shuffledHand.HighestRank(), "Expected highest rank to be a six after shuffle even with aces low")
+	})
 }
 
 func TestFourOfAKind(t *testing.T) {
-	hand := Cards{
-		SixOfSpades(),
-		SixOfHearts(),
-		SixOfDiamonds(),
-		SixOfClubs(),
-		FiveOfSpades(),
-	}
-	assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
-	assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
-	assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
-	assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
-	assert.True(t, hand.containsFourOfAKind(), "Expected hand to be four of a kind")
-	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+	t.Parallel()
+	t.Run("Test Four of a Kind", func(t *testing.T) {
+		hand := Cards{
+			SixOfSpades(),
+			SixOfHearts(),
+			SixOfDiamonds(),
+			SixOfClubs(),
+			FiveOfSpades(),
+		}
+		assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
+		assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
+		assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
+		assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
+		assert.True(t, hand.containsFourOfAKind(), "Expected hand to be four of a kind")
+		assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
 
-	// note that these are *expected* to be true.  the contains* functions
-	// are used in the PokerHand.calculateScore method to determine the best hand
-	// and are checked in sequence of descending value, so if a hand is four of a kind
-	// it will not be checked for full house, three of a kind, etc.
+		// note that these are *expected* to be true. the contains* functions
+		// are used in the PokerHand.calculateScore method to determine the best hand
+		// and are checked in sequence of descending value, so if a hand is four of a kind
+		// it will not be checked for full house, three of a kind, etc.
 
-	// technically quads *is* two pair also, and a hand with quads does
-	// indeed contain three of a kind, and contains a pair.
-	assert.True(t, hand.containsThreeOfAKind(), "Expected hand to contain three of a kind")
-	assert.True(t, hand.containsTwoPair(), "Expected hand to contain two pair")
-	assert.True(t, hand.containsPair(), "Expected hand to contain a pair")
+		// technically quads *is* two pair also, and a hand with quads does
+		// indeed contain three of a kind, and contains a pair.
+		assert.True(t, hand.containsThreeOfAKind(), "Expected hand to contain three of a kind")
+		assert.True(t, hand.containsTwoPair(), "Expected hand to contain two pair")
+		assert.True(t, hand.containsPair(), "Expected hand to contain a pair")
 
-	assert.True(t, hand.HighestRank() == SIX, "Expected highest rank to be a six")
+		assert.Equal(t, SIX, hand.HighestRank(), "Expected highest rank to be a six")
+	})
 }
 
 func TestRoyalFlush(t *testing.T) {
-	hand := Cards{
-		TenOfSpades(),
-		JackOfSpades(),
-		QueenOfSpades(),
-		KingOfSpades(),
-		AceOfSpades(),
-	}
-	assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
-	assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
-	assert.True(t, hand.containsStraightFlush(), "Expected hand to be a straight flush")
-	assert.True(t, hand.containsRoyalFlush(), "Expected hand to be a royal flush")
+	t.Parallel()
+	t.Run("Test Royal Flush", func(t *testing.T) {
+		hand := Cards{
+			TenOfSpades(),
+			JackOfSpades(),
+			QueenOfSpades(),
+			KingOfSpades(),
+			AceOfSpades(),
+		}
+		assert.True(t, hand.containsStraight(), "Expected hand to be a straight")
+		assert.True(t, hand.containsFlush(), "Expected hand to be a flush")
+		assert.True(t, hand.containsStraightFlush(), "Expected hand to be a straight flush")
+		assert.True(t, hand.containsRoyalFlush(), "Expected hand to be a royal flush")
 
-	assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
-	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
-	assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
-	assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
-	assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
+		assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
+		assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+		assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
+		assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
+		assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
 
-	assert.True(t, hand.HighestRank() == ACE, "Expected highest rank to be an ace")
-	assert.False(t, hand.HighestRank() == TEN, "Expected highest rank to not be an ace")
+		assert.Equal(t, ACE, hand.HighestRank(), "Expected highest rank to be an ace")
+		assert.NotEqual(t, TEN, hand.HighestRank(), "Expected highest rank to not be a ten")
+	})
 }
 
 func TestUnmadeHand(t *testing.T) {
-	hand := Cards{
-		TenOfSpades(),
-		JackOfDiamonds(),
-		QueenOfSpades(),
-		KingOfSpades(),
-		DeuceOfSpades(),
-	}
-	assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
-	assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
-	assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
-	assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
-	assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
-	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
-	assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
-	assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
-	assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
-	assert.True(t, hand.HighestRank() == KING, "Expected highest rank to be a king")
-	assert.True(t, hand.isUnmadeHand(), "Expected hand to be unmade")
+	t.Parallel()
+	t.Run("Test Unmade Hand", func(t *testing.T) {
+		hand := Cards{
+			TenOfSpades(),
+			JackOfDiamonds(),
+			QueenOfSpades(),
+			KingOfSpades(),
+			DeuceOfSpades(),
+		}
+		assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
+		assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
+		assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
+		assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
+		assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
+		assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+		assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
+		assert.False(t, hand.containsTwoPair(), "Expected hand to not be two pair")
+		assert.False(t, hand.containsPair(), "Expected hand to not be a pair")
+		assert.Equal(t, KING, hand.HighestRank(), "Expected highest rank to be a king")
+		assert.True(t, hand.isUnmadeHand(), "Expected hand to be unmade")
+	})
 }
 
 func TestTwoPair(t *testing.T) {
-	hand := Cards{
-		KingOfSpades(),
-		JackOfDiamonds(),
-		JackOfSpades(),
-		KingOfDiamonds(),
-		TenOfSpades(),
-	}
-	assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
-	assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
-	assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
-	assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
-	assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
-	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
-	assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
-	assert.True(t, hand.containsTwoPair(), "Expected hand to be two pair")
-	assert.True(t, hand.containsPair(), "Expected hand to also be a pair")
-	assert.True(t, hand.HighestRank() == KING, "Expected highest rank to be a king")
-	assert.False(t, hand.isUnmadeHand(), "Expected hand to not be unmade")
+	t.Parallel()
+	t.Run("Test Two Pair", func(t *testing.T) {
+		hand := Cards{
+			KingOfSpades(),
+			JackOfDiamonds(),
+			JackOfSpades(),
+			KingOfDiamonds(),
+			TenOfSpades(),
+		}
+		assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
+		assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
+		assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
+		assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
+		assert.False(t, hand.containsFourOfAKind(), "Expected hand to not be four of a kind")
+		assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+		assert.False(t, hand.containsThreeOfAKind(), "Expected hand to not be three of a kind")
+		assert.True(t, hand.containsTwoPair(), "Expected hand to be two pair")
+		assert.True(t, hand.containsPair(), "Expected hand to also be a pair")
+		assert.Equal(t, KING, hand.HighestRank(), "Expected highest rank to be a king")
+		assert.False(t, hand.isUnmadeHand(), "Expected hand to not be unmade")
+	})
 }
 
 func TestDetectDuplicates(t *testing.T) {
-	hand := Cards{
-		KingOfSpades(),
-		JackOfDiamonds(),
-		JackOfSpades(),
-		KingOfSpades(),
-		TenOfSpades(),
-	}
-	assert.True(t, hand.containsDuplicates(), "Expected hand to contain duplicates")
+	t.Parallel()
+	t.Run("Test Detect Duplicates", func(t *testing.T) {
+		hand := Cards{
+			KingOfSpades(),
+			JackOfDiamonds(),
+			JackOfSpades(),
+			KingOfSpades(),
+			TenOfSpades(),
+		}
+		assert.True(t, hand.containsDuplicates(), "Expected hand to contain duplicates")
+	})
 }
 
 func TestHandScore(t *testing.T) {
-	hand := Cards{
-		KingOfSpades(),
-		JackOfDiamonds(),
-		JackOfSpades(),
-		KingOfDiamonds(),
-		TenOfSpades(),
-	}
+	t.Parallel()
+	t.Run("Test Hand Score", func(t *testing.T) {
+		hand := Cards{
+			KingOfSpades(),
+			JackOfDiamonds(),
+			JackOfSpades(),
+			KingOfDiamonds(),
+			TenOfSpades(),
+		}
 
-	ph, error := hand.PokerHand()
-	assert.Nil(t, error, "Expected no error")
-	assert.True(t, ph.Score > 0, "Expected score to be nonzero 0")
-	assert.True(t, ph.Score < 100000000000000000, "Expected score to be less than 100000000000000000")
-
-	//fmt.Printf("PokerHand: %v+\n", ph)
-	//fmt.Printf("PH score: %d\n", ph.Score)
+		ph, err := hand.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		assert.True(t, ph.Score > 0, "Expected score to be nonzero")
+		assert.True(t, ph.Score < 100000000000000000, "Expected score to be less than 100000000000000000")
+		// write more assertions FIXME
+	})
 }
 
 func TestTwoPairBug(t *testing.T) {
-	// this is an actual bug in the first implementation
-	c, err := NewCardsFromString("9♠,9♣,Q♥,Q♦,K♣")
-	assert.Nil(t, err, "Expected no error")
+	t.Parallel()
+	t.Run("Test Two Pair Bug", func(t *testing.T) {
+		// this is an actual bug in the first implementation
+		c, err := NewCardsFromString("9♠,9♣,Q♥,Q♦,K♣")
+		assert.NoError(t, err, "Expected no error")
 
-	//fmt.Printf("Cards: %v+\n", c)
-
-	ph, err := c.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	assert.Greater(t, ph.Score, 0, "Expected score to be nonzero 0")
-	desc := ph.Description()
-	assert.Equal(t, desc, "two pair, queens and nines with a king")
-
-	//fmt.Printf("PokerHand: %v+\n", ph)
-	//fmt.Printf("PH score: %d\n", ph.Score)
+		ph, err := c.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		assert.Greater(t, ph.Score, 0, "Expected score to be nonzero")
+		desc := ph.Description()
+		assert.Equal(t, "two pair, queens and nines with a king", desc)
+	})
 }
 
 func TestScoringStructureQuads(t *testing.T) {
-	handA := Cards{
-		DeuceOfSpades(),
-		DeuceOfHearts(),
-		DeuceOfDiamonds(),
-		DeuceOfClubs(),
-		AceOfSpades(),
-	}
+	t.Parallel()
+	t.Run("Test Scoring Structure Quads", func(t *testing.T) {
+		// this test case was for a bug, but is now fixed
+		handA := Cards{
+			DeuceOfSpades(),
+			DeuceOfHearts(),
+			DeuceOfDiamonds(),
+			DeuceOfClubs(),
+			AceOfSpades(),
+		}
 
-	handB := Cards{
-		ThreeOfSpades(),
-		ThreeOfHearts(),
-		ThreeOfDiamonds(),
-		ThreeOfClubs(),
-		DeuceOfSpades(),
-	}
+		handB := Cards{
+			ThreeOfSpades(),
+			ThreeOfHearts(),
+			ThreeOfDiamonds(),
+			ThreeOfClubs(),
+			DeuceOfSpades(),
+		}
 
-	phA, err := handA.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	phB, err := handB.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	assert.Greater(t, phB.Score, phA.Score, "Expected hand B to be higher than hand A")
+		phA, err := handA.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		phB, err := handB.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		assert.Greater(t, phB.Score, phA.Score, "Expected hand B to be higher than hand A")
+	})
 }
 
 func TestScoringStructureFullHouse(t *testing.T) {
-	handA := Cards{
-		DeuceOfSpades(),
-		DeuceOfHearts(),
-		DeuceOfDiamonds(),
-		AceOfSpades(),
-		AceOfHearts(),
-	}
+	t.Parallel()
+	t.Run("Test Scoring Structure Full House", func(t *testing.T) {
+		// this test case documents an actual bug i found in my scoring code
+		// related to the fact that i was multiplying by 100 then by 1000,
+		// instead of by 100 then by 10000 in the scoring. because the ranks
+		// are 2-14, the different levels of kickers (or in the case of a full
+		// house, the pair) were not distinguishing sufficiently.
+		handA := Cards{
+			DeuceOfSpades(),
+			DeuceOfHearts(),
+			DeuceOfDiamonds(),
+			AceOfSpades(),
+			AceOfHearts(),
+		}
 
-	phA, err := handA.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	deucesFullOfAcesScore := phA.Score
+		phA, err := handA.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		deucesFullOfAcesScore := phA.Score
 
-	handB := Cards{
-		ThreeOfSpades(),
-		ThreeOfHearts(),
-		ThreeOfDiamonds(),
-		DeuceOfSpades(),
-		DeuceOfHearts(),
-	}
-	phB, err := handB.PokerHand()
-	assert.Nil(t, err, "Expected no error")
-	threesFullOfDeucesScore := phB.Score
+		handB := Cards{
+			ThreeOfSpades(),
+			ThreeOfHearts(),
+			ThreeOfDiamonds(),
+			DeuceOfSpades(),
+			DeuceOfHearts(),
+		}
+		phB, err := handB.PokerHand()
+		assert.NoError(t, err, "Expected no error")
+		threesFullOfDeucesScore := phB.Score
 
-	assert.Greater(t, threesFullOfDeucesScore, deucesFullOfAcesScore, "Expected Threes full of deuces to beat deuces full of aces")
+		assert.Greater(t, threesFullOfDeucesScore, deucesFullOfAcesScore, "Expected Threes full of deuces to beat deuces full of aces")
+	})
 }