void () { // Gutter icons on functional interfaces are always present, as function search can be slow myFixture.configureByText("Test.java", """ interface Test { void doSomething(); }"""); List<GutterMark> gutters = myFixture.findAllGutters(); assertEquals(2, gutters.size()); assertEquals(AllIcons.Gutter.ImplementedMethod, gutters.get(0).getIcon()); assertEquals(AllIcons.Gutter.ImplementedMethod, gutters.get(1).getIcon()); }