### Question:
StringHashGroupExtractor implements GroupExtractor<T> { @Override public Object apply(T t) { String string = Objects.toString(extractString(t)); HashCode hash = hashFunction.hashUnencodedChars(string); return Math.abs(hash.asInt() % modulus); } StringHashGroupExtractor(int modulus); @Override Object apply(T t);  }### Answer:
@Test public void stringsAreAppropriatelyHashed() { String string1 = "Hello, World"; String string2 = "Hola, Mundo"; GroupExtractor<String> groupExtractor = new TestStringHashGroupExtractor(2); assertEquals(groupExtractor.apply(string1), groupExtractor.apply(string1)); assertNotEquals(groupExtractor.apply(string1), groupExtractor.apply(string2)); }