@Test
	public void testGenerateChildren_CalledFunctionExists() throws Exception {
		String otherAddress = "0x1000";
		builder.createEmptyFunction("Function_1000", otherAddress, 10, DataType.DEFAULT);
		builder.createMemoryCallReference(firstCalledFunctionAddress, otherAddress);

		List<GTreeNode> children = node1.generateChildren(TaskMonitor.DUMMY);
		assertEquals(1, children.size());
		assertEquals("Function_1000", children.get(0).getName());
	}
This test class is covering the various types of 'calls' a function can make, such as a
direct call instruction, or through a user-defined reference.   External calls are also a bit
tricky.   This test was created by following the code paths in {@link OutgoingCallNode}
and making sure that each path was followed.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/calltree/OutgoingCallNodeTest.java