/*
 * Copyright (C) 2019, Google LLC
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.eclipse.jgit.lib;

/** Assertion methods. */
public class MoreAsserts {
	/**
	 * Simple version of assertThrows that will be introduced in JUnit 4.13.
	 *
	 * @param expected
	 *            Expected throwable class
	 * @param r
	 *            Runnable that is expected to throw an exception.
	 * @return The thrown exception.
	 */
	public static <T extends Throwable> T assertThrows(Class<T> expected,
			ThrowingRunnable r) {
		try {
			r.run();
		} catch (Throwable actual) {
			if (expected.isAssignableFrom(actual.getClass())) {
				@SuppressWarnings("unchecked")
				T toReturn = (T) actual;
				return toReturn;
			}
			throw new AssertionError("Expected " + expected.getSimpleName()
					+ ", but got " + actual.getClass().getSimpleName(), actual);
		}
		throw new AssertionError(
				"Expected " + expected.getSimpleName() + " to be thrown");
	}

	public interface ThrowingRunnable {
		void run() throws Throwable;
	}

	private MoreAsserts() {
	}
}