service/src/test/java/org/apache/griffin/core/metric/MetricStoreImplTest.java

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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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package org.apache.griffin.core.metric;

import org.apache.griffin.core.metric.model.MetricValue;
import org.apache.http.HttpEntity;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URISyntaxException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.BDDMockito.*;

@RunWith(PowerMockRunner.class)
@PrepareForTest({RestClient.class, RestClientBuilder.class})
@PowerMockIgnore("javax.management.*")
public class MetricStoreImplTest {

    private static final String INDEX = "griffin";
    private static final String TYPE = "accuracy";

    private static final String urlBase = String.format("/%s/%s", INDEX, TYPE);
    private static final String urlGet = urlBase.concat("/_search?filter_path=hits.hits._source");

    private RestClient restClientMock;

    @Before
    public void setup(){
        PowerMockito.mockStatic(RestClient.class);
        restClientMock = PowerMockito.mock(RestClient.class);
        RestClientBuilder restClientBuilderMock = PowerMockito.mock(RestClientBuilder.class);

        given(RestClient.builder(anyVararg())).willReturn(restClientBuilderMock);
        given(restClientBuilderMock.build()).willReturn(restClientMock);
    }

    @Test
    public void testBuildBasicAuthString()
            throws NoSuchMethodException, InvocationTargetException,
            IllegalAccessException {
        Method m = MetricStoreImpl.class.getDeclaredMethod
                ("buildBasicAuthString", String.class,
                        String.class);
        m.setAccessible(true);
        String authStr = (String) m.invoke(null, "user", "password");
        assertTrue(authStr.equals("Basic dXNlcjpwYXNzd29yZA=="));
    }

    @Test
    public void testMetricGetting() throws IOException, URISyntaxException {
        //given
        Response responseMock = PowerMockito.mock(Response.class);
        HttpEntity httpEntityMock = PowerMockito.mock(HttpEntity.class);
        InputStream is = Thread.currentThread().getContextClassLoader()
                .getResourceAsStream("metricvalue.json");
        Map<String, String> map = new HashMap<>();
        map.put("q", "metadata.applicationId:application_1549876136110_0018");

        Map<String, Object> value = new HashMap<String, Object>(){{
            put("total", 74);
            put("miss", 0);
            put("matched", 74);
            put("matchedFraction", 1);
        }};
        MetricValue expectedMetric = new MetricValue("de_demo_results_comparision",
                1549985089648L,
                Collections.singletonMap("applicationId", "application_1549876136110_0018"),
                value);


        given(restClientMock.performRequest(eq("GET"), eq(urlGet), eq(map), anyVararg())).willReturn(responseMock);
        given(responseMock.getEntity()).willReturn(httpEntityMock);
        given(httpEntityMock.getContent()).willReturn(is);

        //when
        MetricStoreImpl metricStore = new MetricStoreImpl("", 0, "", "", "");
        MetricValue metric = metricStore.getMetric("application_1549876136110_0018");

        //then
        PowerMockito.verifyStatic();
        assertEquals(expectedMetric, metric);
    }

}