void () { myFixture.addClass("package org.junit.jupiter.api;" + "import java.util.function.BooleanSupplier;" + "public class Assertions {\n" + " public static void assertNotNull(Object actual){}" + " public static void assertNotNull(Object actual, String message){}" + " public static void assertTrue(boolean b, String message){}" + " public static void assertTrue(BooleanSupplier b, String message){}" + "}"); checkHighlighting(); }