Function TestFilterReadsNoMoreThanRequested

script_test.go:420–446

(t *testing.T)

}

func TestFilterReadsNoMoreThanRequested(t *testing.T) {
	t.Parallel()
	input := "firstline\nsecondline"
	source := bytes.NewBufferString(input)
	p := script.NewPipe().WithReader(source).Filter(func(r io.Reader, w io.Writer) error {
		// read just the first line of input
		var text string
		_, err := fmt.Fscanln(r, &text)
		if err != nil {
			return err
		}
		fmt.Fprintln(w, text)
		return nil
	})
	want := "firstline\n"
	got, err := p.String()
	if err != nil {
		t.Fatal(err)
	}
	if want != got {
		t.Fatal(cmp.Diff(want, got))
	}
	wantRemaining := "secondline"
	if wantRemaining != source.String() {
		t.Errorf("want %q remaining, got %q", wantRemaining, source.String())
	}
}

func TestFilterByFirstLineOnlyGivesFirstLineOfInput(t *testing.T) {
	t.Parallel()