### Question:
HMapIF implements MapIF, Cloneable, Serializable { @Override public void increment(int key) { if (this.containsKey(key)) { this.put(key, (float) this.get(key) + 1.0f); } else { this.put(key, 1.0f); } } HMapIF(int initialCapacity, float loadFactor);  HMapIF(int initialCapacity);  HMapIF();  HMapIF(MapIF m); int size(); boolean isEmpty(); float get(int key); boolean containsKey(int key); float put(int key, float value); void putAll(MapIF m); float remove(int key); void clear(); boolean containsValue(float value); Object clone(); Set<Integer> keySet(); Collection<Float> values(); Set<MapIF.Entry> entrySet(); String toString(); @Override void plus(MapIF m); @Override double dot(MapIF m); @Override void increment(int key); @Override void increment(int key, float value); float length(); void normalize(); MapIF.Entry[] getEntriesSortedByValue(); MapIF.Entry[] getEntriesSortedByValue(int n);  }### Answer:
@Test public void testIncrement() { HMapIF m = new HMapIF(); assertEquals(0.0f, m.get(1), 10E-6); m.increment(1, 0.5f); assertEquals(0.5f, m.get(1), 10E-6); m.increment(1); m.increment(2, 0.0f); m.increment(3, -0.5f); assertEquals(1.5f, m.get(1), 10E-6); assertEquals(0.0f, m.get(2), 10E-6); assertEquals(-0.5f, m.get(3), 10E-6); }