@Test
public void testContainsType() {
Collection<A> collection = new HashSet<A>();
collection.add(new B());
collection.add(new B());
assertTrue(Groups.containsType(A.class, collection));
assertTrue(Groups.containsType(B.class, collection));
assertFalse(Groups.containsType(C.class, collection));
}
@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)));
}
@Test
public void testOfType() {
Collection<A> collection = new HashSet<A>();
collection.add(new A());
collection.add(new B());
collection.add(new B());
collection.add(new A());
collection.add(new B());
collection.add(new A());
collection.add(new A());
collection.add(new C());
assertTrue(Groups.ofType(A.class, collection).size() == 8);
assertTrue(Groups.ofType(B.class, collection).size() == 3);
assertTrue(Groups.ofType(C.class, collection).size() == 1);
}