Calculator JUnit Tests in Maven Project

Introduction

In this tutorial, we will create a simple Maven project with Calculator tests and run the JUnit tests in the Maven build process.

Create Maven Project

We can use the quick start archetype to create a simple Maven project with basic project directory structure.

https://www.testingdocs.com/create-quickstart-maven-project-in-eclipse-ide/

Calculator Tests

Add code for the Calculator class and the corresponding tests for the calculator object. Example Calculator code and tests are at:

https://www.testingdocs.com/junit-calculator-test-case-example/

Project Structure

Java code to be tested goes under src/main/java

Test code goes under src/test/java

Maven surefire plugin

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>3.0.0-M4</version>
        <dependencies>
          <dependency>
            <groupId>org.apache.maven.surefire</groupId>
            <artifactId>surefire-junit47</artifactId>
            <version>3.0.0-M4</version>
          </dependency>
        </dependencies>
      </plugin>

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>com.testingdocs.sample</groupId>
  <artifactId>Sample</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>Sample</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.7</version>
      <scope>test</scope>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>3.0.0-M4</version>
        <dependencies>
          <dependency>
            <groupId>org.apache.maven.surefire</groupId>
            <artifactId>surefire-junit47</artifactId>
            <version>3.0.0-M4</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

Maven Build

Run As >> Maven Build

Add Maven goals like clean install

The JUnit Calculator tests will run as part of the Maven build process.