@Test
 public void should_return_false_if_OS_is_not_Linux() {
   Platform.initialize(windowsXP(), toolkitProvider);
   assertThat(Platform.isLinux()).isFalse();
 }
 static {
   // initialize
   Platform.initialize();
 }
 @Test
 public void should_return_true_if_OS_is_Linux() {
   Platform.initialize(linux(), toolkitProvider);
   assertThat(Platform.isLinux()).isTrue();
 }