@Test
	public void testDnDCopyFrag2FragInvalid() throws Exception {
		// drag/copy a fragment onto another fragment
		// verify that there is no valid drop target

		ProgramNode textNode = root.getChild(".text");
		ProgramNode debugNode = root.getChild(".debug_data");

		assertDropSiteInvalid(debugNode, textNode);
	}
Tests for drag/drop/reorder for copy and move in the program tree.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin3Test.java