@Test public void orThrow() throws Exception { try { OptionalFloat.absent().orThrow(new Exception("An exception occurred.")); Assert.fail("Invoking orThrow() on an absent optional should throw an exception."); } catch (Exception anException) { // No-op. This is the expected behaviour. } }
@Test public void orThrowWithSupplier() throws Exception { final Supplier<Exception> anExceptionSupplier = new Supplier<Exception>() { @Override public Exception get() { return new Exception("An exception occurred."); } }; try { OptionalFloat.absent().orThrow(anExceptionSupplier); Assert.fail("Invoking orThrow() on an absent optional should throw an exception."); } catch (Exception anException) { // No-op. This is the expected behaviour. } }
@Test public void orWithSupplier() throws Exception { Assert.assertEquals(42f, OptionalFloat.absent().or(new FloatSupplier() { @Override public float get() { return 42f; } }), 0); }
@Test public void absent() throws Exception { Assert.assertFalse(OptionalFloat.absent().isPresent()); }
@Test public void or() throws Exception { Assert.assertEquals(42f, OptionalFloat.absent().or(42f), 0); }
@Test public void ifPresent() throws Exception { OptionalFloat.of(42f).ifPresent(new FloatConsumer() { @Override public void consume(float value) { Assert.assertEquals(42f, value, 0); } }); OptionalFloat.absent().ifPresent(new FloatConsumer() { @Override public void consume(float value) { Assert.fail("ifPresent() on an absent optional should never call its consumer"); } }); }
@Test public void isPresent() throws Exception { Assert.assertTrue(OptionalFloat.of(42f).isPresent()); Assert.assertFalse(OptionalFloat.absent().isPresent()); }
@Test public void ifPresentOrElse() throws Exception { OptionalFloat.of(42f).ifPresentOrElse(new FloatConsumer() { @Override public void consume(float value) { Assert.assertEquals(42f, value, 0); } }, new Function() { @Override public void call() { Assert.fail("ifPresent() on an non-absent optional should call its consumer"); } }); OptionalFloat.absent().ifPresentOrElse(new FloatConsumer() { @Override public void consume(float value) { Assert.fail("ifPresent() on an absent optional should never call its consumer"); } }, new Function() { @Override public void call() { Assert.assertTrue(true); // No-op. This is the expected behaviour. } }); } }
@Test public void get() throws Exception { Assert.assertEquals(42f, OptionalFloat.of(42f).get(), 0); try { OptionalFloat.absent().get(); Assert.fail("Invoking get() on an absent optional should raise an exception."); } catch (IllegalStateException expected) { // No-op. This is the expected behaviour. } }