@Test
	public void testNoFitPointerOnFixedDt() throws Exception {
		init(simpleStructure, pgmBbCat);
		model.clearComponents(new int[] { 2 });

		DataType dt1 = getDataType(1);
		setSelection(new int[] { 1 });
		invoke(pointerAction);
		assertEquals(9, getModel().getNumComponents());
		assertEquals("byte", getDataType(1).getName());
		assertEquals(getDataType(1), dt1);
		assertTrue(getModel().getStatus().contains("requires 1 additional"));
		assertEquals(1, getDataType(1).getLength());
		assertEquals(1, getModel().getComponent(1).getLength());
		assertEquals(DataType.DEFAULT, getDataType(2));
		assertEquals(29, model.getLength());
	}
Edit an existing structure and create a structure from a selection. Use the conflicting 
names followed by a good non-default name.
@throws Exception if the test throws an exception
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/compositeeditor/StructureEditorLockedActions3Test.java