@Test public void of() throws Exception { Assert.assertTrue(OptionalByte.of(((byte) 42)).isPresent()); }
@Test public void ifPresent() throws Exception { OptionalByte.of(((byte) 42)).ifPresent(new ByteConsumer() { @Override public void consume(byte value) { Assert.assertEquals(((byte) 42), value); } }); OptionalByte.absent().ifPresent(new ByteConsumer() { @Override public void consume(byte value) { Assert.fail("ifPresent() on an absent optional should never call its consumer"); } }); }
@Test public void isPresent() throws Exception { Assert.assertTrue(OptionalByte.of(((byte) 42)).isPresent()); Assert.assertFalse(OptionalByte.absent().isPresent()); }
@Test public void get() throws Exception { Assert.assertEquals(((byte) 42), OptionalByte.of(((byte) 42)).get()); try { OptionalByte.absent().get(); Assert.fail("Invoking get() on an absent optional should raise an exception."); } catch (IllegalStateException expected) { // No-op. This is the expected behaviour. } }
@Test public void ifPresentOrElse() throws Exception { OptionalByte.of(((byte) 42)).ifPresentOrElse(new ByteConsumer() { @Override public void consume(byte value) { Assert.assertEquals(((byte) 42), value); } }, new Function() { @Override public void call() { Assert.fail("ifPresent() on an non-absent optional should call its consumer"); } }); OptionalByte.absent().ifPresentOrElse(new ByteConsumer() { @Override public void consume(byte 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. } }); } }