@Test
    public void shouldDetermineIfTraverserIsPresent() {
        final TraverserSet<String> ts = makeStringTraversers();

        assertThat(ts.contains(makeTraverser("a", 1)), is(true));
        assertThat(ts.contains(makeTraverser("b1", 1)), is(true));
        assertThat(ts.contains(makeTraverser("b2", 1)), is(true));
        assertThat(ts.contains(makeTraverser("c", 1)), is(true));
        assertThat(ts.contains(makeTraverser("notHere", 1)), is(false));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/util/TraverserSetImplementationTest.java