Function TestSelectEventProcessor_AutoMode

cmd/compose/compose_progress_test.go:82–133

TestSelectEventProcessor_AutoMode covers the regression from docker/compose#13570: auto mode must probe Err() (not Out()) so `docker compose up | tee log` still renders the colorized UI on stderr.

(t *testing.T)

// auto mode must probe Err() (not Out()) so `docker compose up | tee log` still
// renders the colorized UI on stderr.
func TestSelectEventProcessor_AutoMode(t *testing.T) {
	tests := []struct {
		name     string
		outIsTTY bool
		errIsTTY bool
		ansi     string
		wantType string
	}{
		{
			name:     "stderr TTY, stdout piped -> Full",
			errIsTTY: true,
			ansi:     "auto",
			wantType: "*display.ttyWriter",
		},
		{
			name:     "stderr piped, stdout TTY -> Plain (do not fall back to stdout)",
			outIsTTY: true,
			ansi:     "auto",
			wantType: "*display.plainWriter",
		},
		{
			name:     "both TTY -> Full",
			outIsTTY: true,
			errIsTTY: true,
			ansi:     "auto",
			wantType: "*display.ttyWriter",
		},
		{
			name:     "both piped -> Plain",
			ansi:     "auto",
			wantType: "*display.plainWriter",
		},
		{
			name:     "ansi never forces Plain even when stderr is TTY",
			outIsTTY: true,
			errIsTTY: true,
			ansi:     "never",
			wantType: "*display.plainWriter",
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			saveGlobalState(t)
			cli := newMockCli(t, newStream(t, tc.outIsTTY), newStream(t, tc.errIsTTY))

			ep, err := selectEventProcessor(cli, "", tc.ansi, false)
			assert.NilError(t, err)
			assert.Equal(t, fmt.Sprintf("%T", ep), tc.wantType)
		})
	}
}

func TestSelectEventProcessor_ExplicitMode(t *testing.T) {
	tests := []struct {