Testing with our container image
If you are in container land this guide will show you how to use our container image for testing.
In 5 steps you will learn how to it. They are:
- Create the Maven POM file
- Add the helloworld.html page
- Add an integration test
- Create the Dockerfile
- Test the application
Create the Maven POM file
Create an empty directory to store your Maven project. Inside of that directory create the pom.xml file with the content as below.
<?xml version="1.0" encoding="UTF-8"?>
<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>cloud.piranha.guides.webprofile</groupId>
<artifactId>docker</artifactId>
<version>24.11.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>Testing with our container image</name>
<properties>
<!-- dependencies -->
<jakartaee.version>11.0.0-M4</jakartaee.version>
<junit.version>5.10.0-M1</junit.version>
<!-- plugins -->
<docker-maven-plugin.version>0.43.4</docker-maven-plugin.version>
<maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
<maven-failsafe-plugin.version>3.0.0</maven-failsafe-plugin.version>
<maven-war-plugin.version>3.3.2</maven-war-plugin.version>
<!-- other -->
<java.version>21</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>jakarta.platform</groupId>
<artifactId>jakarta.jakartaee-web-api</artifactId>
<version>${jakartaee.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-params</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>image</finalName>
<plugins>
<plugin>
<groupId>io.fabric8</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>${docker-maven-plugin.version}</version>
<configuration>
<images>
<image>
<alias>image</alias>
<build>
<buildx>
<platforms>
<platform>linux/amd64</platform>
<platform>linux/arm64</platform>
</platforms>
</buildx>
<contextDir>${basedir}</contextDir>
<dockerFile>src/main/docker/Dockerfile</dockerFile>
</build>
<run>
<ports>
<port>8080:8080</port>
</ports>
<wait>
<http>
<url>http://localhost:8080/helloworld.html</url>
</http>
<time>20000</time>
</wait>
</run>
</image>
</images>
</configuration>
<executions>
<execution>
<id>start</id>
<phase>pre-integration-test</phase>
<goals>
<goal>build</goal>
<goal>start</goal>
</goals>
</execution>
<execution>
<id>stop</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${java.version}</release>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>${maven-failsafe-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>${maven-war-plugin.version}</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
Add the Hello World HTML file
Add the helloworld.html file in the src/main/webapp directory.
<!DOCTYPE html>
<html>
<head>
<title>Hello World</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>Hello World!</div>
</body>
</html>
Add an integration test
As we want to make sure the application gets tested before we release an integration test is added which will be executed as part of the build.
We'll add the integration test to the src/test/java directory.
package helloworld;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;
class HelloWorldIT {
@Test
void testHelloWorldHtml() throws Exception {
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest
.newBuilder(new URI("http://localhost:8080/helloworld.html"))
.build();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
assertTrue(response.body().contains("Hello World!"));
}
}
Create the Dockerfile
Create the Dockerfile in the src/main/docker directory with the following
content:
FROM ghcr.io/piranhacloud/webprofile:23.12.0
USER piranha
COPY target/image.war /home/piranha/ROOT.war
CMD ["java", "-jar", "piranha-dist-webprofile.jar", "--war-file", "ROOT.war"]
Test the application
The application is setup to use the Docker Maven plugin to do integration testing so when you are building the application it will also execute an integration test validating the web application works.
To build and test the application execute the following command:
mvn install
Conclusion
As you can see getting testing with our container image is easy!