Handy hamcrest map matcher

MapMatcher.java

    public static class MapMatcher<K, V> extends TypeSafeMatcher<Map<K, V>> {

        private final Map<K, V> desiredContents = new HashMap<>();

        @Override
        protected boolean matchesSafely(final Map<K, V> item) {
            for(final Map.Entry<K, V> kvEntry : this.desiredContents.entrySet()) {
                if (!kvEntry.getValue().equals(item.get(kvEntry.getKey()))) {
                    return false;
                }
            }
            return true;
        }

        @Override
        public void describeTo(final Description description) {
            description.appendText("Contains entries: ").appendValue(this.desiredContents);
        }

        public MapMatcher<K, V> contains(final K key, final V value) {
            this.desiredContents.put(key, value);
            return this;
        }

        public static <K, V> MapMatcher<K, V> matcher() {
            return new MapMatcher<K, V>();
        }
    }