TestHelpers.java

/*
 * Copyright 2013 Cloudera Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cloudera.cdk.data;

import org.junit.Assert;

public class TestHelpers {
  /**
   * A convenience method to avoid a large number of @Test(expected=...) tests
   * @param message A String message to describe this assertion
   * @param expected An Exception class that the Runnable should throw
   * @param runnable A Runnable that is expected to throw the exception
   */
  public static void assertThrows(
      String message, Class<? extends Exception> expected, Runnable runnable) {
    try {
      runnable.run();
      Assert.fail("No exception was thrown (" + message + "), expected: " +
          expected.getName());
    } catch (Exception actual) {
      Assert.assertEquals(message, expected, actual.getClass());
    }
  }
}