@Test
	public void testGetSuccessors_LargerIndex() {
		Set<Integer> successorsSet = graphPath.getSuccessors(graphPath.size());
		assertEquals(0, successorsSet.size());
	}
Test to verify if getPredecessors() function works correctly. At setUp() a GraphPath is
created containing 21 vertices, with the last vertex having integer 20. Assert checks if
getSuccessors() returns an empty HashSet whenever it is called with a larger index than
the amount of vertices contained in the GraphPath.
Ghidra/Framework/Graph/src/test.slow/java/ghidra/graph/GraphPathTest.java