@Test
public void testFirstOfType() {
Collection<A> collection = new HashSet<A>();
collection.add(new B());
collection.add(new B());
assertTrue(Groups.firstOfType(C.class, collection) == null);
assertTrue(collection.contains(Groups.firstOfType(A.class, collection)));
assertTrue(collection.contains(Groups.firstOfType(B.class, collection)));
}
@Test
public void testFirstEmpty() {
Collection<String> collection = new HashSet<String>();
assertTrue(Groups.first(collection) == null);
collection.add("Hello World");
assertTrue(Groups.first(collection).equals("Hello World"));
collection.add("Goodbye World");
assertTrue(collection.contains(Groups.first(collection)));
}
