AccessorTest.java

final class AccessorTest {

	@Test // SUCCESS
	@DisplayName("Verify MethodHandles.Lookup constructor")
	void lookupConstructorAvailabilityTest() {
		Assertions.assertDoesNotThrow(() -> Accessor.newLookupConstructor());
	}

	@Test // SUCCESS
	@DisplayName("Verify available matching instance method is called")
	void findMatchingMethodAndCallTest() {
		ObjectAccessor accessor = Accessor.to(ObjectAccessor.class, TestObject.class, "instanceMethod");
		Assertions.assertNotNull(accessor);
		Assertions.assertTrue(accessor.instanceMethod(new TestObject()));
	}

	@Test // SUCCESS
	@DisplayName("Verify available matching static method is called")
	void findMatchingStaticMethodAndCallTest() {
		ObjectAccessor accessor = Accessor.to(ObjectAccessor.class, TestObject.class, "staticMethod");
		Assertions.assertNotNull(accessor);
		Assertions.assertTrue(accessor.staticMethod());
	}

	@Test // FAILURE
	@DisplayName("Verify java.lang.Object#toString works")
	void testDynamicToStringInvokation() {
		ToString accessor = Accessor.to(ToString.class, Object.class, "toString");
		// ^ java.lang.NoClassDefFoundError: com/gmail/justisroot/autoecon/data/AccessorTest$ToString
		Assertions.assertNotNull(accessor);
		Assertions.assertEquals(accessor.toString(Integer.valueOf(42)), Integer.valueOf(42));
	}

	public interface ObjectAccessor {
		public boolean instanceMethod(TestObject o);
		public boolean staticMethod();
	}

	public interface ToString {
		public String toString(Object o);
	}