protected FGVertex getFocusedVertex() {
		FGData graphData = getFunctionGraphData();
		assertNotNull(graphData);
		assertTrue("Unexpectedly received an empty FunctionGraphData", graphData.hasResults());
		ProgramLocation location = getLocationForAddressString(startAddressString);
		assertTrue(graphData.containsLocation(location));
		FunctionGraph functionGraph = graphData.getFunctionGraph();

		// locate vertex with cursor
		FGVertex focusedVertex = getFocusVertex(functionGraph);
		assertNotNull("We did not start with a focused vertex", focusedVertex);
		return focusedVertex;
	}
Finds an edge that represents the given edge, which may no longer exist with
the same (==) edge instances.
Ghidra/Features/FunctionGraph/src/test.slow/java/ghidra/app/plugin/core/functiongraph/AbstractFunctionGraphTest.java