Java JUnit test job

## Objective

Test your Java project using [Apache Maven](http://maven.apache.org/) JDK 11, JaCoCo and Surefire Maven plugins for code coverage and tests report directly in your merge requests.

## How to use it

1. Make sure your Java project is set up to use Maven. You can refer to the [Maven quick start guide](http://maven.apache.org/guides/getting-started/index.html)

2. Use the provided `pom.xml` in the example below to get you started. You are then free to customize your `pom.xml`

depending on your needs. You can also use this job along with the `maven_build` job on the R2DevOps hub for a completely

automated Java pipeline. 

3. Add the job URL inside the `include` list of your `.gitlab-ci.yml` file  (see the [quick setup](/use-the-hub/#quick-setup)). You can specify [a fixed version](#changelog) instead of `latest`.

    ```yaml

      - remote: 'https://jobs.r2devops.io/latest/junit_test.yml'

    ```

4. If you need to customize the job (stage, variables, ...) check the [jobs-customization](/use-the-hub/#jobs-customization)

5. Grab a ☕ while the job is running !

## Example pom.xml

```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>com.myorg.myproject</groupId>

<artifactId>myartifact</artifactId>

<packaging>jar</packaging>

<version>1.0-SNAPSHOT</version>

<properties>

  <junit.version>4.12</junit.version>

</properties>

<dependencyManagement>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>${junit.version}</version>

      <scope>test</scope>

    </dependency>

  </dependencies>

</dependencyManagement>

<dependencies>

  <dependency>

    <groupId>junit</groupId>

    <artifactId>junit</artifactId>

    <scope>test</scope>

  </dependency>

</dependencies>

<build>

  <directory>${artifactsDirectory}</directory>

  <pluginManagement>

    <plugins>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-compiler-plugin</artifactId>

        <version>3.8.1</version>

      </plugin>

      <plugin>

        <groupId>org.jacoco</groupId>

        <artifactId>jacoco-maven-plugin</artifactId>

        <version>0.8.6</version>

      </plugin>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-surefire-plugin</artifactId>

        <version>3.0.0-M5</version>

      </plugin>

    </plugins>

  </pluginManagement>

  <plugins>

    <plugin>

      <groupId>org.apache.maven.plugins</groupId>

      <artifactId>maven-compiler-plugin</artifactId>

      <configuration>

        <source>11</source>

        <target>11</target>

      </configuration>

    </plugin>

    <plugin>

      <groupId>org.jacoco</groupId>

      <artifactId>jacoco-maven-plugin</artifactId>

      <executions>

        <execution>

          <id>prepare-agent</id>

          <goals>

            <goal>prepare-agent</goal>

          </goals>

        </execution>

        <execution>

          <id>generate-code-coverage-report</id>

          <phase>test</phase>

          <goals>

            <goal>report</goal>

          </goals>

        </execution>

      </executions>

    </plugin>

  </plugins>

</build>

</project>

```

## Job details

* Job name: `junit_test`

* Docker image: [maven:3.6.3-jdk-11](https://hub.docker.com/_/maven)

* Default stage: `static_tests`

* When: `always`

### Variables

| Name | Description | Default |

| ---- | ------------| ------- |

| `ARTIFACTS_DIR` | Customize the path where the artifacts will be created | `${CI_PROJECT_DIR}/artifacts` |

### Artifacts

We use [Junit](https://junit.org/junit5/){:target="_blank"}'s XML report to display error report

directly in pipeline `Test` tab and in merge request widget. It's also available directly in the artifacts.

name: junit_test

description: Run unit tests of a Java project using Maven and JUnit

default_stage: static_tests

icon: 🧪

maintainer: alexlevy

license: MIT

labels:

  - Java

  - Test

images:

  'maven': '3.6.3-jdk-11'

tools:

  maven: '3.6.3'

stages:

  - static_tests

junit_test:

  image:

    name: maven:3.6.3-jdk-11

    entrypoint: [""]

  stage: static_tests

  variables:

    ARTIFACTS_DIR: ${CI_PROJECT_DIR}/artifacts

  script:

      - mkdir -p ${ARTIFACTS_DIR}

      - mvn -B clean test -DartifactsDirectory=${ARTIFACTS_DIR}

      - cat ${ARTIFACTS_DIR}/site/jacoco/jacoco.csv | awk -F"," '{ instructions += $4 + $5; covered += $5 } END { print covered, "/", instructions, "instructions covered"; print 100*covered/instructions, "% covered" }'

  artifacts: 

    when: always

    paths:

      - "${ARTIFACTS_DIR}/surefire-reports/TEST-*.xml"

    reports:

      junit:

        - "${ARTIFACTS_DIR}/surefire-reports/TEST-*.xml"

  coverage: '/^(\d+.\d+\ %) covered$/'

* Initial version