@Before
	public void setUp() {
		graphPath = new GraphPath<>();
		for (int i = 0; i <= 20; i++) {
			graphPath.add(i);
		}
	}
Setup to have a new GraphPath instance for every test that is filled with 21 vertices.
Ghidra/Framework/Graph/src/test.slow/java/ghidra/graph/GraphPathTest.java