void () { configureAndComplete(); final List<String> lookupElementStrings = myFixture.getLookupElementStrings(); assertNotNull(lookupElementStrings); final String buttonVariant = "Button"; assertContainsElements(lookupElementStrings, buttonVariant); assertTrue(lookupElementStrings.toString(), lookupElementStrings.lastIndexOf(buttonVariant) == lookupElementStrings.indexOf(buttonVariant)); }