/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.testutils.junit;

import org.junit.AfterClass;
import org.junit.Rule;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class RetryOnFailureTest {

	@Rule
	public RetryRule retryRule = new RetryRule();

	private static final int NUMBER_OF_RUNS = 5;

	private static int numberOfFailedRuns;

	private static int numberOfSuccessfulRuns;

	private static boolean firstRun = true;

	@AfterClass
	public static void verify() throws Exception {
		assertEquals(NUMBER_OF_RUNS + 1, numberOfFailedRuns);
		assertEquals(3, numberOfSuccessfulRuns);
	}

	@Test
	@RetryOnFailure(times = NUMBER_OF_RUNS)
	public void testRetryOnFailure() throws Exception {
		// All but the (expected) last run should be successful
		if (numberOfFailedRuns < NUMBER_OF_RUNS) {
			numberOfFailedRuns++;
			throw new RuntimeException("Expected test exception");
		}
		else {
			numberOfSuccessfulRuns++;
		}
	}

	@Test
	@RetryOnFailure(times = NUMBER_OF_RUNS)
	public void testRetryOnceOnFailure() throws Exception {
		if (firstRun) {
			numberOfFailedRuns++;
			firstRun = false;
			throw new RuntimeException("Expected test exception");
		}
		else {
			numberOfSuccessfulRuns++;
		}
	}

	@Test
	@RetryOnFailure(times = NUMBER_OF_RUNS)
	public void testDontRetryOnSuccess() throws Exception {
		numberOfSuccessfulRuns++;
	}

}