/*
 * 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 RetryOnExceptionTest {

	@Rule
	public RetryRule retryRule = new RetryRule();

	private static final int NUMBER_OF_RUNS = 3;
	
	private static int runsForSuccessfulTest = 0;

	private static int runsForTestWithMatchingException = 0;

	private static int runsForTestWithSubclassException = 0;
	
	private static int runsForPassAfterOneFailure = 0;

	
	@AfterClass
	public static void verify() {
		assertEquals(NUMBER_OF_RUNS + 1, runsForTestWithMatchingException);
		assertEquals(NUMBER_OF_RUNS + 1, runsForTestWithSubclassException);
		assertEquals(1, runsForSuccessfulTest);
		assertEquals(2, runsForPassAfterOneFailure);
	}

	@Test
	@RetryOnException(times = NUMBER_OF_RUNS, exception = IllegalArgumentException.class)
	public void testSuccessfulTest() {
		runsForSuccessfulTest++;
	}

	@Test
	@RetryOnException(times = NUMBER_OF_RUNS, exception = IllegalArgumentException.class)
	public void testMatchingException() {
		runsForTestWithMatchingException++;
		if (runsForTestWithMatchingException <= NUMBER_OF_RUNS) {
			throw new IllegalArgumentException();
		}
	}

	@Test
	@RetryOnException(times = NUMBER_OF_RUNS, exception = RuntimeException.class)
	public void testSubclassException() {
		runsForTestWithSubclassException++;
		if (runsForTestWithSubclassException <= NUMBER_OF_RUNS) {
			throw new IllegalArgumentException();
		}
	}

	@Test
	@RetryOnException(times = NUMBER_OF_RUNS, exception = IllegalArgumentException.class)
	public void testPassAfterOneFailure() {
		runsForPassAfterOneFailure++;
		if (runsForPassAfterOneFailure == 1) {
			throw new IllegalArgumentException();
		}
	}
}