Kohei Nozaki's blog 

Mocking a HTTP server with WireMock


Posted on Saturday Feb 22, 2014 at 08:47AM in Technology


Environment

  • WireMock 1.4.3
  • HttpClient 4.2.3
  • Oracle JDK7u51

Resources

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.nailedtothex</groupId>
    <artifactId>wiremock</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
          <groupId>org.hamcrest</groupId>
          <artifactId>hamcrest-core</artifactId>
          <version>1.3</version>
          <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.github.tomakehurst</groupId>
            <artifactId>wiremock</artifactId>
            <version>1.43</version>
            <classifier>standalone</classifier>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>*</groupId>
                    <artifactId>*</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>fluent-hc</artifactId>
            <version>4.3.2</version>
        </dependency>
    </dependencies>

</project>

HttpFetcher.java

package org.nailedtothex.wiremock;

import java.io.IOException;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.fluent.Request;

public class HttpFetcher {

    public String fetchAsString(String url) throws ClientProtocolException, IOException {
        return Request.Get(url).execute().returnContent().asString();
    }
}

HttpFetcherTest.java

package org.nailedtothex.wiremock;

import static com.github.tomakehurst.wiremock.client.WireMock.*;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

import org.apache.http.client.HttpResponseException;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import com.github.tomakehurst.wiremock.junit.WireMockRule;

public class HttpFetcherTest {

    @Rule
    public WireMockRule wireMockRule = new WireMockRule(18089);

    private HttpFetcher instance;

    @Before
    public void init() {
        instance = new HttpFetcher();
        stubFor(get(urlEqualTo("/hoge.txt")).willReturn(
                aResponse().withStatus(200).withHeader("Content-Type", "text/plain").withBody("hoge")));
        stubFor(get(urlEqualTo("/500.txt")).willReturn(
                aResponse().withStatus(500).withHeader("Content-Type", "text/plain").withBody("hoge")));
        stubFor(get(urlEqualTo("/503.txt")).willReturn(
                aResponse().withStatus(503).withHeader("Content-Type", "text/plain").withBody("hoge")));
    }

    @Test
    public void ok() throws Exception {
        String actual = instance.fetchAsString("http://localhost:18089/hoge.txt");
        String expected = "hoge";
        assertThat(actual, is(expected));
    }

    @Test(expected = HttpResponseException.class)
    public void notFound() throws Exception {
        instance.fetchAsString("http://localhost:18089/NOT_FOUND");
    }

    @Test(expected = HttpResponseException.class)
    public void internalServerError() throws Exception {
        instance.fetchAsString("http://localhost:18089/500.txt");
    }

    @Test(expected = HttpResponseException.class)
    public void serviceUnavailable() throws Exception {
        instance.fetchAsString("http://localhost:18089/503.txt");
    }
}

Remarks

  • To check behavior of the mock with browsers, we can set an breakpoint in the test class to prevent shutdown of the mock HTTP server.
    • I have checked that stub urls are working as I expected with firebug.
  • WireMock dependency brings many its dependencies, but I guess that are not necessary because it is classified as standalone, so I just add exclusions and it is working without any problems anyway.

References

  1. WireMock | WireMock
  2. Apache HttpComponents - Apache HttpComponents



Comments:

I have checked that stub URLs are working as I expected with firebug. https://gas-stationsnearme.com/mobil/
WireMock dependency brings many its dependencies, but I guess that are not necessary because it is classified as standalone, so I just add exclusions and it is working without any problems anyway.

Posted by Phyllis on April 23, 2022 at 08:41 AM JST #


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