clawbot
62f769ae9b
SHA256File returns the SHA-256 digest of a file's contents as lowercase hexadecimal, copying the file through the hash in chunks so its size does not matter. Comes with a doc comment and table-driven tests. (closes #19) Model: opus-5
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
package util
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import (
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"bytes"
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"os"
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"path/filepath"
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"strings"
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"testing"
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)
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func TestSHA256File(t *testing.T) {
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tests := []struct {
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name string
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contents []byte
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expected string
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}{
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{
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"an empty file",
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[]byte{},
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"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
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},
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{
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"a short file",
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[]byte("hello world\n"),
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"a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447",
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},
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{
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"binary contents",
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[]byte{0x00, 0x01, 0x02, 0x03},
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"054edec1d0211f624fed0cbca9d4f9400b0e491c43742af2c5b0abebf0c990d8",
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},
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{
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"larger than one read buffer",
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bytes.Repeat([]byte("a"), 100000),
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"6d1cf22d7cc09b085dfc25ee1a1f3ae0265804c607bc2074ad253bcc82fd81ee",
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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path := filepath.Join(t.TempDir(), "file")
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if err := os.WriteFile(path, test.contents, 0644); err != nil {
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t.Fatalf("could not write the test file: %v", err)
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}
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got, err := SHA256File(path)
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if err != nil {
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t.Fatalf("did not expect an error, got %v", err)
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}
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if got != test.expected {
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t.Errorf("expected %q got %q", test.expected, got)
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}
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if got != strings.ToLower(got) {
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t.Errorf("expected lowercase hexadecimal, got %q", got)
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}
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})
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}
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}
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func TestSHA256FileReportsAMissingFile(t *testing.T) {
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path := filepath.Join(t.TempDir(), "not-there")
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got, err := SHA256File(path)
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if err == nil {
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t.Fatalf("expected an error for a file that does not exist, got %q", got)
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}
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if !os.IsNotExist(err) {
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t.Errorf("expected an error that os.IsNotExist recognises, got %v", err)
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}
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}
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func TestSHA256FileReportsADirectory(t *testing.T) {
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if _, err := SHA256File(t.TempDir()); err == nil {
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t.Errorf("expected an error for a directory")
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}
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}
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