Add tests for status output

Test: status_test.go
Change-Id: If3febd8fdacb0e70716d0520a41c982bd6474720

ui/terminal/util.go

@@ -29,6 +29,8 @@ func isTerminal(w io.Writer) bool {
 			ioctlGetTermios, uintptr(unsafe.Pointer(&termios)),
 			0, 0, 0)
 		return err == 0
+	} else if _, ok := w.(*fakeSmartTerminal); ok {
+		return true
 	}
 	return false
 }
@@ -43,6 +45,8 @@ func termWidth(w io.Writer) (int, bool) {
 			syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&winsize)),
 			0, 0, 0)
 		return int(winsize.ws_column), err == 0
+	} else if f, ok := w.(*fakeSmartTerminal); ok {
+		return f.termWidth, true
 	}
 	return 0, false
 }
@@ -99,3 +103,8 @@ func stripAnsiEscapes(input []byte) []byte {
 
 	return input
 }
+
+type fakeSmartTerminal struct {
+	bytes.Buffer
+	termWidth int
+}