Bug 327980 Part activation history should not be perspective-dependent
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
EPartService partService = (EPartService) window.getContext().get(
				EPartService.class.getName());
		MPart createdPart = partService.createPart("partId");
		MPart shownPart = partService.showPart(createdPart, partState);
		assertNotNull(shownPart);
		if (multipleAllowed) {
			assertEquals(createdPart, shownPart);
		} else {
			assertEquals(part, shownPart);
		}
	}
	public void testShowPart_Part_MultipleExists_TrueACTIVATE() {
		testShowPart_Part_MultipleExists(true, PartState.ACTIVATE);
	}
	public void testShowPart_Part_MultipleExists_FalseACTIVATE() {
		testShowPart_Part_MultipleExists(false, PartState.ACTIVATE);
	}
	public void testShowPart_Part_MultipleExists_TrueVISIBLE() {
		testShowPart_Part_MultipleExists(true, PartState.VISIBLE);
	}
	public void testShowPart_Part_MultipleExists_FalseVISIBLE() {
		testShowPart_Part_MultipleExists(false, PartState.VISIBLE);
	}
	public void testShowPart_Part_MultipleExists_TrueCREATE() {
		testShowPart_Part_MultipleExists(true, PartState.CREATE);
	}
	public void testShowPart_Part_MultipleExists_FalseCREATE() {
		testShowPart_Part_MultipleExists(false, PartState.CREATE);
	}
	private void testShowPart_Part_MultipleNonexistent(boolean multipleAllowed,