SimpleContainer implements Containerlike<T> { @Override public boolean add(T o) { if (o == null) { throw new NullPointerException("parameter cannot be null"); } T thing = (T)o; if (sizeLimit >= 0 && storage.size() >= sizeLimit) { throw new IllegalStateException("Already full"); } else if (this.canFit(thing)) { return this.storage.add(thing); } else { throw new IllegalStateException("Can't fit that there."); } } SimpleContainer();  SimpleContainer(ThingTypeCheck<T> verifier);  SimpleContainer(ThingTypeCheck<T> verifier, int limit); @Override boolean canFit(T thing); @Override Collection<T> findSimilar(ThingTypeCheck<T>judge); @Override Collection<T> removeUnfit(); @Override boolean hasUnfit(); @Override void setVerifier(ThingTypeCheck<T> verifier); @Override ThingTypeCheck<T> getVerifier(); @Override boolean hasSizeLimit(); @Override int getSizeLimit(); @Override int setSizeLimit(int limit); @Override boolean add(T o); @Override boolean offer(T o); @Override int size(); @Override boolean isEmpty(); @Override boolean contains(Object o); @Override Iterator<T> iterator(); @Override T[] toArray(); @Override T[] toArray(T[] a); @Override boolean remove(Object o); @Override boolean containsAll(Collection c); @Override boolean addAll(Collection c); @Override boolean removeAll(Collection c); @Override boolean retainAll(Collection c); @Override void clear(); @Override boolean equals(Object obj); @Override int hashCode();  }
@Test @Covers("public boolean add(T)") public void testAdd() { Object o = new Integer(10); SimpleContainer instance = new SimpleContainer(); assertTrue(instance.add(o)); }