Assert { public static void assertTrue(boolean expression) { assertTrue(expression, null, null, (Object[]) null); }  static T assertNotNull(T object); static T assertNotNull(T object, String message, Object...args); static T assertNotNull(T object, ExceptionType exceptionType, String message, Object...args); static T assertNull(T object); static T assertNull(T object, String message, Object...args); static T assertNull(T object, ExceptionType exceptionType, String message, Object...args); static void assertTrue(boolean expression); static void assertTrue(boolean expression, String message, Object...args); static void assertTrue(boolean expression, ExceptionType exceptionType, String message, Object...args); static T unreachableCode(); static T unreachableCode(String message, Object...args); static T unexpectedException(Throwable e); static T unexpectedException(Throwable e, String message, Object...args); static T fail(); static T fail(String message, Object...args); static T unsupportedOperation(); static T unsupportedOperation(String message, Object...args);  }
@Test public void assertTrue() { Assert.assertTrue(true); try { Assert.assertTrue(false); } catch (IllegalArgumentException e) { assertThat(e, exception(IllegalArgumentException.class, DEFAULT_HEADER, "must be true")); } Assert.assertTrue(true, MESSAGE); try { Assert.assertTrue(false, MESSAGE); } catch (IllegalArgumentException e) { assertThat(e, exception(IllegalArgumentException.class, MESSAGE)); } try { Assert.assertTrue(false, MESSAGE, 1); } catch (IllegalArgumentException e) { assertThat(e, exception(IllegalArgumentException.class, MESSAGE_1)); } Assert.assertTrue(true, Assert.ExceptionType.ILLEGAL_STATE, MESSAGE); try { Assert.assertTrue(false, Assert.ExceptionType.ILLEGAL_STATE, MESSAGE); } catch (IllegalStateException e) { assertThat(e, exception(IllegalStateException.class, MESSAGE)); } try { Assert.assertTrue(false, Assert.ExceptionType.ILLEGAL_STATE, MESSAGE, 1); } catch (IllegalStateException e) { assertThat(e, exception(IllegalStateException.class, MESSAGE_1)); } }