RestTemplateExchangeTagsTest.java

/**
 * Copyright 2019 Pivotal Software, Inc.
 * <p>
 * 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
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 io.micrometer.spring.web.client;

import io.micrometer.core.instrument.Tag;
import org.junit.Test;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.mock.http.client.MockClientHttpResponse;

import java.io.IOException;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.mock;

/**
 * Tests for {@link RestTemplateExchangeTags}.
 *
 * @author Nishant Raut
 * @author Brian Clozel
 */
public class RestTemplateExchangeTagsTest {

    @Test
    public void outcomeTagIsUnknownWhenResponseIsNull() {
        Tag tag = RestTemplateExchangeTags.outcome(null);
        assertThat(tag.getValue()).isEqualTo("UNKNOWN");
    }

    @Test
    public void outcomeTagIsInformationalWhenResponseIs1xx() {
        ClientHttpResponse response = new MockClientHttpResponse("foo".getBytes(), HttpStatus.CONTINUE);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("INFORMATIONAL");
    }

    @Test
    public void outcomeTagIsSuccessWhenResponseIs2xx() {
        ClientHttpResponse response = new MockClientHttpResponse("foo".getBytes(), HttpStatus.OK);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("SUCCESS");
    }

    @Test
    public void outcomeTagIsRedirectionWhenResponseIs3xx() {
        ClientHttpResponse response = new MockClientHttpResponse("foo".getBytes(), HttpStatus.MOVED_PERMANENTLY);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("REDIRECTION");
    }

    @Test
    public void outcomeTagIsClientErrorWhenResponseIs4xx() {
        ClientHttpResponse response = new MockClientHttpResponse("foo".getBytes(), HttpStatus.BAD_REQUEST);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("CLIENT_ERROR");
    }

    @Test
    public void outcomeTagIsServerErrorWhenResponseIs5xx() {
        ClientHttpResponse response = new MockClientHttpResponse("foo".getBytes(), HttpStatus.BAD_GATEWAY);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("SERVER_ERROR");
    }

    @Test
    public void outcomeTagIsUnknownWhenResponseThrowsIOException() throws Exception {
        ClientHttpResponse response = mock(ClientHttpResponse.class);
        given(response.getRawStatusCode()).willThrow(new IOException());
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("UNKNOWN");
    }

    @Test
    public void outcomeTagIsUnknownForCustomResponseStatus() throws Exception {
        ClientHttpResponse response = mock(ClientHttpResponse.class);
        given(response.getRawStatusCode()).willThrow(new IllegalArgumentException());
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("UNKNOWN");
    }

    @Test
    public void outcomeTagIsClientErrorWhenResponseIsNonStandardInClientSeries() throws IOException {
        ClientHttpResponse response = mock(ClientHttpResponse.class);
        given(response.getRawStatusCode()).willReturn(490);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("CLIENT_ERROR");
    }

    @Test
    public void outcomeTagIsUnknownWhenResponseStatusIsInUnknownSeries() throws IOException {
        ClientHttpResponse response = mock(ClientHttpResponse.class);
        given(response.getRawStatusCode()).willReturn(701);
        Tag tag = RestTemplateExchangeTags.outcome(response);
        assertThat(tag.getValue()).isEqualTo("UNKNOWN");
    }

}