void (final String actionName, final String inputName, @Nullable final String outputName, final String extension) { String path = PlatformTestUtil.lowercaseFirstLetter(inputName, true) + ".fxml"; myFixture.configureByFiles(path, inputName + extension); if (outputName == null) { assertNull(myFixture.getAvailableIntention(actionName)); } else { final IntentionAction intention = myFixture.findSingleIntention(actionName); myFixture.launchAction(intention); myFixture.checkResultByFile(inputName + extension, outputName + "_after" + extension, true); } }