@Test
    void dropWhile() {
        assertEquals(0, instance.dropWhile(ELEMENT::equals).count());
        assertEquals(1, instance.dropWhile(OTHER_ELEMENT::equals).count());
    }
Test of mapToInt method, of class SingletonStream.
common-parent/singletonstream/src/test/java/com/speedment/common/singletonstream/SingletonStreamTest.java