@Test
    void iteratorNextAndThenForEachRemaining() {
        final AtomicInteger cnt = new AtomicInteger();
        final Iterator<String> iterator = instance.iterator();
        iterator.next();
        iterator.forEachRemaining(s -> cnt.incrementAndGet());
        assertEquals(0, cnt.get());
    }
Test of mapToInt method, of class SingletonStream.
common-parent/singletonstream/src/test/java/com/speedment/common/singletonstream/SingletonStreamTest.java