### Question:
FindWithinGenerator implements BinaryFunction<Generator<? extends E>, Predicate<? super E>, E> { public static FindWithinGenerator<Object> instance() { return INSTANCE; } FindWithinGenerator();  FindWithinGenerator(E ifNone); E evaluate(Generator<? extends E> left, Predicate<? super E> right); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString(); static FindWithinGenerator<Object> instance(); static final FindWithinGenerator<Object> INSTANCE; }### Answer:
@Test public void testInstance() { assertNotNull("FindWithinGenerator instance must not be null", FindWithinGenerator.instance()); }