| package colorable |
| |
| import ( |
| "bytes" |
| "os" |
| "runtime" |
| "testing" |
| ) |
| |
| // checkEncoding checks that colorable is output encoding agnostic as long as |
| // the encoding is a superset of ASCII. This implies that one byte not part of |
| // an ANSI sequence must give exactly one byte in output |
| func checkEncoding(t *testing.T, data []byte) { |
| // Send non-UTF8 data to colorable |
| b := bytes.NewBuffer(make([]byte, 0, 10)) |
| if b.Len() != 0 { |
| t.FailNow() |
| } |
| // TODO move colorable wrapping outside the test |
| c := NewNonColorable(b) |
| c.Write(data) |
| if b.Len() != len(data) { |
| t.Fatalf("%d bytes expected, got %d", len(data), b.Len()) |
| } |
| } |
| |
| func TestEncoding(t *testing.T) { |
| checkEncoding(t, []byte{}) // Empty |
| checkEncoding(t, []byte(`abc`)) // "abc" |
| checkEncoding(t, []byte(`é`)) // "é" in UTF-8 |
| checkEncoding(t, []byte{233}) // 'é' in Latin-1 |
| } |
| |
| func TestNonColorable(t *testing.T) { |
| var buf bytes.Buffer |
| want := "hello" |
| NewNonColorable(&buf).Write([]byte("\x1b[0m" + want + "\x1b[2J")) |
| got := buf.String() |
| if got != "hello" { |
| t.Fatalf("want %q but %q", want, got) |
| } |
| |
| buf.Reset() |
| NewNonColorable(&buf).Write([]byte("\x1b[")) |
| got = buf.String() |
| if got != "" { |
| t.Fatalf("want %q but %q", "", got) |
| } |
| } |
| |
| func TestNonColorableNil(t *testing.T) { |
| paniced := false |
| func() { |
| defer func() { |
| recover() |
| paniced = true |
| }() |
| NewNonColorable(nil) |
| NewColorable(nil) |
| }() |
| |
| if !paniced { |
| t.Fatalf("should panic") |
| } |
| } |
| |
| func TestColorable(t *testing.T) { |
| if runtime.GOOS == "windows" { |
| t.Skipf("skip this test on windows") |
| } |
| _, ok := NewColorableStdout().(*os.File) |
| if !ok { |
| t.Fatalf("should os.Stdout on UNIX") |
| } |
| _, ok = NewColorableStderr().(*os.File) |
| if !ok { |
| t.Fatalf("should os.Stdout on UNIX") |
| } |
| _, ok = NewColorable(os.Stdout).(*os.File) |
| if !ok { |
| t.Fatalf("should os.Stdout on UNIX") |
| } |
| } |