Refine Slice read error test
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parent
552b338381
commit
4761259567
@ -53,8 +53,7 @@ func TestSlice(t *testing.T) {
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}))
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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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c := ptest.ErrCursor[byte](expectedErr)
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s := rapid.SliceOfN(rapid.Byte(), 0, 100).Draw(t, "s")
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result, err := gigaparsec.Slice(s)(gigaparsec.MakeState(c))
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failed, _, _ := result.Failed()
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@ -1,7 +1,11 @@
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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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import (
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"io"
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"git.codemonkeysoftware.net/b/gigaparsec/cursor"
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)
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type errReaderAt struct {
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err error
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@ -15,3 +19,26 @@ func (r errReaderAt) ReadAt([]byte, int64) (int, error) {
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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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type errCursor[T any] struct {
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err error
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pos uint64
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}
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func (c errCursor[T]) Read([]T) (uint64, cursor.Cursor[T], error) {
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return 0, c, c.err
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}
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func (c errCursor[T]) At(pos uint64) cursor.Cursor[T] {
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c.pos = pos
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return c
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}
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func (c errCursor[T]) Pos() uint64 {
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return c.pos
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}
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// ErrCursor return a [cursor.Cursor] with a Read method that always returns err.
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func ErrCursor[T any](err error) cursor.Cursor[T] {
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return errCursor[T]{err: err}
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}
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