How to use should_instantiate_field_with_default_constructor method of org.mockito.internal.util.reflection.FieldInitializerTest class

Best Mockito code snippet using org.mockito.internal.util.reflection.FieldInitializerTest.should_instantiate_field_with_default_constructor

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...41 Assert.assertTrue(report.fieldWasInitialized());42 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());43 }44 @Test45 public void should_instantiate_field_with_default_constructor() throws Exception {46 FieldInitializer fieldInitializer = new FieldInitializer(this, field("defaultConstructor"));47 FieldInitializationReport report = fieldInitializer.initialize();48 Assert.assertNotNull(report.fieldInstance());49 Assert.assertTrue(report.fieldWasInitialized());50 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());51 }52 @Test53 public void should_instantiate_field_with_private_default_constructor() throws Exception {54 FieldInitializer fieldInitializer = new FieldInitializer(this, field("privateDefaultConstructor"));55 FieldInitializationReport report = fieldInitializer.initialize();56 Assert.assertNotNull(report.fieldInstance());57 Assert.assertTrue(report.fieldWasInitialized());58 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());59 }...

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should_instantiate_field_with_default_constructor

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1package org.mockito.internal.util.reflection;2import static org.assertj.core.api.Assertions.assertThat;3import static org.mockito.internal.util.reflection.FieldInitializer.should_instantiate_field_with_default_constructor;4import java.util.List;5import org.junit.Test;6public class FieldInitializerTest {7 public void should_instantiate_field_with_default_constructor() {8 class ClassWithDefaultConstructor {9 }10 ClassWithDefaultConstructor classWithDefaultConstructor = new ClassWithDefaultConstructor();11 boolean actualResult = should_instantiate_field_with_default_constructor(classWithDefaultConstructor);12 assertThat(actualResult).isTrue();13 }14}

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should_instantiate_field_with_default_constructor

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1public void should_instantiate_field_with_default_constructor() {2 Field field = new FieldHolder().getField();3 Object instance = new FieldHolder();4 FieldInitializer.initialize(field, instance);5 assertThat(instance, hasField("field", "value"));6}7public static Matcher<Object> hasField(String fieldName, Object value) {8 return new HasField(fieldName, value);9}10public class HasField extends TypeSafeMatcher<Object> {11 private final String fieldName;12 private final Object value;13 public HasField(String fieldName, Object value) {14 this.fieldName = fieldName;15 this.value = value;16 }17 public boolean matchesSafely(Object instance) {18 Field field = null;19 try {20 field = instance.getClass().getDeclaredField(fieldName);21 field.setAccessible(true);22 return field.get(instance).equals(value);23 } catch (NoSuchFieldException e) {24 throw new RuntimeException(e);25 } catch (IllegalAccessException e) {26 throw new RuntimeException(e);27 }28 }29 public void describeTo(Description description) {30 description.appendText("has field ").appendText(fieldName).appendText(" with value ").appendValue(value);31 }32}33public class FieldHolder {34 private String field;35 public FieldHolder() {36 this.field = "value";37 }38 public Field getField() {39 try {40 return getClass().getDeclaredField("field");41 } catch (NoSuchFieldException e) {42 throw new RuntimeException(e);43 }44 }45}46public class FieldInitializer {47 public static void initialize(Field field, Object instance) {48 try {49 field.setAccessible(true);50 field.set(instance, field.getType().newInstance());51 } catch (IllegalAccessException e) {52 throw new RuntimeException(e);53 } catch (InstantiationException e) {54 throw new RuntimeException(e);55 }56 }57}58public class FieldInitializer {

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Here is what I did to test my code using Mockito and Apache HttpBuilder:

Class under test:

import java.io.BufferedReader;
import java.io.IOException;

import javax.ws.rs.core.Response.Status;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class StatusApiClient {
private static final Logger LOG = LoggerFactory.getLogger(StatusApiClient.class);

    private String targetUrl = "";
    private HttpClient client = null;
    HttpGet httpGet = null;

    public StatusApiClient(HttpClient client, HttpGet httpGet) {
        this.client = client;
        this.httpGet = httpGet;
    }

    public StatusApiClient(String targetUrl) {
        this.targetUrl = targetUrl;
        this.client = HttpClientBuilder.create().build();
        this.httpGet = new HttpGet(targetUrl);
    }

    public boolean getStatus() {
        BufferedReader rd = null;
        boolean status = false;
        try{
            LOG.debug("Requesting status: " + targetUrl);


            HttpResponse response = client.execute(httpGet);

            if(response.getStatusLine().getStatusCode() == Status.OK.getStatusCode()) {
                LOG.debug("Is online.");
                status = true;
            }

        } catch(Exception e) {
            LOG.error("Error getting the status", e);
        } finally {
            if (rd != null) {
                try{
                    rd.close();
                } catch (IOException ioe) {
                    LOG.error("Error while closing the Buffered Reader used for reading the status", ioe);
                }
            }   
        }

        return status;
    }
}

Test:

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.HttpHostConnectException;
import org.junit.Assert;
import org.junit.Test;
import org.mockito.Mockito;

public class StatusApiClientTest extends Mockito {

    @Test
    public void should_return_true_if_the_status_api_works_properly() throws ClientProtocolException, IOException {
        //given:
        HttpClient httpClient = mock(HttpClient.class);
        HttpGet httpGet = mock(HttpGet.class);
        HttpResponse httpResponse = mock(HttpResponse.class);
        StatusLine statusLine = mock(StatusLine.class);

        //and:
        when(statusLine.getStatusCode()).thenReturn(200);
        when(httpResponse.getStatusLine()).thenReturn(statusLine);
        when(httpClient.execute(httpGet)).thenReturn(httpResponse);

        //and:
        StatusApiClient client = new StatusApiClient(httpClient, httpGet);

        //when:
        boolean status = client.getStatus();

        //then:
        Assert.assertTrue(status);
    }

    @Test
    public void should_return_false_if_status_api_do_not_respond() throws ClientProtocolException, IOException {
        //given:
        HttpClient httpClient = mock(HttpClient.class);
        HttpGet httpGet = mock(HttpGet.class);
        HttpResponse httpResponse = mock(HttpResponse.class);
        StatusLine statusLine = mock(StatusLine.class);

        //and:
        when(httpClient.execute(httpGet)).thenThrow(HttpHostConnectException.class);

        //and:
        StatusApiClient client = new StatusApiClient(httpClient, httpGet);

        //when:
        boolean status = client.getStatus();

        //then:
        Assert.assertFalse(status);
    }

}

What do you think folks, do I need to improve something? (Yeah, I know, the comments. That is something I brought from my Spock background :D)

https://stackoverflow.com/questions/20542361/mocking-apache-httpclient-using-mockito

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