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Factored out Slice failure assertions

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This commit is contained in:
Brandon Dyck 2024-09-09 15:13:37 -06:00
parent 8943da5aee
commit 2759894ed8
1 changed files with 15 additions and 12 deletions
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27
parser_test.go
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@ -23,27 +23,30 @@ func hasPrefix(prefix []byte) func([]byte) bool {
}
func TestSlice(t *testing.T) {
assertParseFails := func(t rapid.TB, input []byte, p gigaparsec.Parser[byte, []byte]) (parseErr gigaparsec.ParseError) {
t.Helper()
start := gigaparsec.MakeState(cursor.NewSlice(input))
consumed, result, err := p(start)
test.ErrorAs(t, err, &parseErr, test.Sprint("expected ParseError"))
test.False(t, consumed, test.Sprint("expected consumed to be false"))
test.SliceEmpty(t, result.Value, test.Sprint("expected result value to be empty"))
if t.Failed() {
t.FailNow()
}
return parseErr
}
t.Run("fails with wrong contents", rapid.MakeCheck(func(t *rapid.T) {
s := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "s")
input := rapid.SliceOfN(rapid.Byte(), len(s), -1).
Filter(notP(hasPrefix(s))).Draw(t, "input")
start := gigaparsec.MakeState(cursor.NewSlice(input))
consumed, result, err := gigaparsec.Slice(s)(start)
test.ErrorAs(t, err, &gigaparsec.ParseError{})
test.False(t, consumed, test.Sprint("expected consumed to be false"))
test.SliceEmpty(t, result.Value)
assertParseFails(t, input, gigaparsec.Slice(s))
}))
t.Run("fails at end of input", rapid.MakeCheck(func(t *rapid.T) {
s := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "s")
inputLen := rapid.IntRange(0, len(s)-1).Draw(t, "inputLen")
input := s[:inputLen]
start := gigaparsec.MakeState(cursor.NewSlice(input))
consumed, result, err := gigaparsec.Slice(s)(start)
test.ErrorAs(t, err, &gigaparsec.ParseError{})
test.False(t, consumed, test.Sprint("expected consumed to be false"))
test.SliceEmpty(t, result.Value)
assertParseFails(t, input, gigaparsec.Slice(s))
}))
t.Run("fails when read fails", Todo)
t.Run("succeeds when contents match", rapid.MakeCheck(func(t *rapid.T) {