ThrowableHelper.java

/*
 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package java.util.stream;

import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;

public final class ThrowableHelper {

    public static void checkException(Class<? extends Exception> ce, Runnable r) {
        Exception caught = null;
        try {
            r.run();
        } catch (Exception e) {
            caught = e;
        }

        assertNotNull(caught);
        assertTrue(ce.isInstance(caught));
    }

    public static void checkNPE(Runnable r) {
        checkException(NullPointerException.class, r);
    }

    public static void checkISE(Runnable r) {
        checkException(IllegalStateException.class, r);
    }
}