Here you can find the source of assertTrue(boolean value)
public static void assertTrue(boolean value)
//package com.java2s; /*// w w w . java2 s . c o m * JBoss, Home of Professional Open Source * Copyright 2009, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. * See the copyright.txt in the distribution for a full listing * of individual contributors. * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU Lesser General Public License, v. 2.1. * This program is distributed in the hope that it will be useful, but WITHOUT A * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License, * v.2.1 along with this distribution; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. * * (C) 2008, * @author JBoss, a division of Red Hat. */ public class Main { public static void assertTrue(boolean value) { if (!value) { fail("assertionFailed"); } } public static void fail(String message) { System.out.println("failing: " + message); System.out.println("Failed"); } }