return 0, errors.New("writeErrorOnlyWriter error")
}

// Ensure that previous Write errors are immediately returned
// on any ReadFrom. See golang.org/issue/35194.
func TestWriterReadFromMustReturnUnderlyingError(t *testing.T) {
	var wr = NewWriter(writeErrorOnlyWriter{})
	s := "test1"
	wantBuffered := len(s)
	if _, err := wr.WriteString(s); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}