clawbot
aeb040d156
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internal/calc gets its own tokenizer and precedence-climbing parser in place of go/parser, which cannot express a power operator; go/constant still computes. ^ (also **) binds tighter than * / % and a sign on its left, and groups to the right. % takes the sign of the divisor and is exact on decimals. A whole exponent is computed exactly while the result's numerator and denominator stay within 4096 bits; otherwise, and for a fractional exponent, in float64. A remainder, or the sign of a negative base's power, that depends on a value go/constant holds rounded is refused as too large. The welcome text and the replies mention the new operators; a negative base with a fractional exponent gets its own reply. Model: opus-5-5
39 lines
998 B
Go
39 lines
998 B
Go
package bot_test
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import (
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"strings"
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"testing"
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"sneak.berlin/go/simplexcalc/internal/bot"
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"sneak.berlin/go/simplexcalc/internal/calc"
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)
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// TestReply: a result is sent bare, and every way of failing gets its
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// own short explanation rather than silence.
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func TestReply(t *testing.T) {
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t.Parallel()
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for in, want := range map[string]string{
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"2 + 2": "4",
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"5 * 5/2": "12.5",
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"2^10": "1024",
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"7 % 3": "1",
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} {
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if got := bot.Reply(in); got != want {
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t.Errorf("Reply(%q) = %q, want %q", in, got, want)
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}
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}
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for in, want := range map[string]string{
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"hello": "I only understand arithmetic",
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"1 / 0": "I cannot divide by zero.",
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"1e400": "The result is too large for me.",
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"(-8)^0.5": "A negative number to a fractional power has no real",
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strings.Repeat("1+", calc.MaxInputLength) + "1": "That is too long for me",
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} {
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if got := bot.Reply(in); !strings.HasPrefix(got, want) {
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t.Errorf("Reply(%q) = %q, want it to start %q", in, got, want)
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}
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}
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}
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