Test Slice with a failing reader
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2
TODO.txt
2
TODO.txt
@ -1,2 +1,4 @@
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Result should be Failed by default
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Test RuneReader
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Test Regexp
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Add SPDX tags
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@ -2,10 +2,12 @@ package gigaparsec_test
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import (
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"bytes"
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"errors"
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"testing"
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"git.codemonkeysoftware.net/b/gigaparsec"
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"git.codemonkeysoftware.net/b/gigaparsec/cursor"
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ptest "git.codemonkeysoftware.net/b/gigaparsec/test"
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"github.com/shoenig/test"
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"github.com/shoenig/test/must"
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"pgregory.net/rapid"
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@ -49,7 +51,14 @@ func TestSlice(t *testing.T) {
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input := s[:inputLen]
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assertParseFails(t, input, gigaparsec.Slice(s))
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}))
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t.Run("fails when read fails", Todo)
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t.Run("fails when read fails", rapid.MakeCheck(func(t *rapid.T) {
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expectedErr := rapid.Map(rapid.StringN(0, 100, -1), errors.New).Draw(t, "err")
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r := ptest.ErrReaderAt(expectedErr)
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c := cursor.NewReaderAt(r)
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s := rapid.SliceOfN(rapid.Byte(), 0, 100).Draw(t, "s")
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_, err := gigaparsec.Slice(s)(gigaparsec.MakeState(c))
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test.ErrorIs(t, err, expectedErr)
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}))
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t.Run("succeeds when contents match", rapid.MakeCheck(func(t *rapid.T) {
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input := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "input")
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sLen := rapid.IntRange(0, len(input)).Draw(t, "sLen")
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17
test/readerat.go
Normal file
17
test/readerat.go
Normal file
@ -0,0 +1,17 @@
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// Package test contains helpers for testing parsers.
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package test
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import "io"
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type errReaderAt struct {
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err error
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}
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func (r errReaderAt) ReadAt([]byte, int64) (int, error) {
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return 0, r.err
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}
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// ErrReaderAt returns an [io.ReaderAt] with a ReadAt method that always returns err.
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func ErrReaderAt(err error) io.ReaderAt {
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return errReaderAt{err: err}
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}
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