Here you can find the source of assertTrue(final boolean result, final String faultDescription)
public static void assertTrue(final boolean result, final String faultDescription)
//package com.java2s; //License from project: Apache License public class Main { public static void assertTrue(final boolean result, final String faultDescription) { if (!result) { throw new IllegalArgumentException(String.format( "[Assertion failed error. Expected true value for %s, but got false]", faultDescription)); }/*from ww w. jav a 2 s . c om*/ } }