/*
 * Copyright 2013-2019 the original author or authors.
 *
 * 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
 *
 *      https://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 demo;

import java.io.InputStream;
import java.net.URL;

import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.junit4.SpringRunner;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
@DirtiesContext
public class HystrixApplicationTests {

	@LocalServerPort
	int port;

	@Test
	public void testOk() {
		ResponseEntity<String> response = new TestRestTemplate().getForEntity("http://localhost:" + port, String.class);
		assertNotNull("response was null", response);
		assertEquals("Bad status code", HttpStatus.OK, response.getStatusCode());
		assertEquals("Wrong response text", "OK", response.getBody());
	}

	@Test
	public void testFallback() {
		ResponseEntity<String> response = new TestRestTemplate().getForEntity("http://localhost:" + port + "/fail",
				String.class);
		assertNotNull("response was null", response);
		assertEquals("Bad status code", HttpStatus.OK, response.getStatusCode());
		assertEquals("Wrong response text", "from the fallback", response.getBody());
	}

	@Test
	public void hystrixStreamWorks() throws Exception {
		String url = "http://localhost:" + port;
		// you have to hit a Hystrix circuit breaker before the stream sends anything
		ResponseEntity<String> response = new TestRestTemplate().getForEntity(url, String.class);
		assertEquals("bad response code", HttpStatus.OK, response.getStatusCode());

		URL hystrixUrl = new URL(url + "/actuator/hystrix.stream");
		InputStream in = hystrixUrl.openStream();
		byte[] buffer = new byte[1024];
		in.read(buffer);
		String contents = new String(buffer);
		assertTrue("Wrong content: \n" + contents, contents.contains("data") || contents.contains("ping"));
		in.close();
	}

}
