@Test
public void hasHashCodeWithoutJavaClass() {
TestClass testClass = new TestClass(null);
testClass.hashCode();
// everything is fine if no exception is thrown.
}
@Test
public void hasSameHashCodeAsTestClassThatWrapsSameJavaClass() {
TestClass testClass = new TestClass(DummyClass.class);
TestClass testClassThatWrapsSameJavaClass = new TestClass(DummyClass.class);
assertEquals(testClass.hashCode(), testClassThatWrapsSameJavaClass.hashCode());
}