@Test
public void callTheSpinAndWarmUpMethods() throws Exception {
Method accessor = checkThatSingletonContainsStaticInstanceAccessorMethod(Earth.class);
Earth earth = (Earth) accessor.invoke(null);
earth.spin();
earth.warmUp();
}
@Test
public void makeEarthWithAnotherClassLoader() throws Exception {
Earth old = Earth.getEarth();
replaceEarth(FastEarth.class.getName());
FastEarth fast = FastEarth.class.cast(Earth.getEarth());
assertNotSame(old, fast);
replaceEarth(SlowEarth.class.getName());
SlowEarth slow = SlowEarth.class.cast(Earth.getEarth());
assertNotSame(old, slow);
assertNotSame(fast, slow);
}