@Test
    void testOf() {
        final SingletonStream<String> ss = SingletonStream.of(OTHER_ELEMENT);
        final List<String> s = ss.collect(toList());
        assertEquals(singletonList(OTHER_ELEMENT), s);
    }
Test of of method, of class SingletonStream.
common-parent/singletonstream/src/test/java/com/speedment/common/singletonstream/SingletonStreamTest.java