private void createFunctionAtEntry() {
		FunctionManager fm = program.getFunctionManager();
		Function f = fm.getFunctionAt(addr("0x1006420"));
		if (f != null) {
			// we want to recreate the function, to get better analysis
			deleteExistingFunction(f.getEntryPoint());
		}

		createFunctionAt("0x1006420");

		assertEquals(1, program.getListing().getGlobalFunctions("entry").size());
	}
Tests that an invalid parameter type entry will generate the proper error message
shown in the status box, and NOT present the user with a stack trace.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/function/editor/FunctionEditorDialogTest.java