Bug 266146 [CSS] JUnit for: Property retrieval must check instanceof and return null
tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/CTabFolderTest.java
CTabFolder folderToTest = createTestCTabFolder("CTabFolder { simple: true}");
		assertEquals(true, folderToTest.getSimple());
		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "simple", null));
		folderToTest.getShell().close();
		folderToTest = createTestCTabFolder("CTabFolder { simple: false}");
		assertEquals(false, folderToTest.getSimple());
		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "simple", null));
	}
	
	public void testMaximizeVisible() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { maximizeVisible: true}");
		assertEquals(true, folderToTest.getMaximizeVisible());
		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "maximizeVisible", null));
		folderToTest.getShell().close();
		folderToTest = createTestCTabFolder("CTabFolder { maximizeVisible: false}");
		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "maximizeVisible", null));
		assertEquals(false, folderToTest.getMaximizeVisible());
	}
	
	public void testMinimizeVisible() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { minimizeVisible: true}");
		assertEquals(true, folderToTest.getMinimizeVisible());
		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "minimizeVisible", null));
		folderToTest.getShell().close();
		folderToTest = createTestCTabFolder("CTabFolder { minimizeVisible: false}");
		assertEquals(false, folderToTest.getMinimizeVisible());
		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "minimizeVisible", null));
	}
	
	public void testMRUVisible() throws Exception {