JUnit

• http://junit.org
• Test Framework
• Function Test
• input/output test set
• testName() prefix
• @Test annotation

Required

• junit.jar
  • https://mvnrepository.com/artifact/junit/junit/4.13.2

Getting started

• Calculator.java

javaCopy
public class Calculator {
  public int evaluate(String expression) {
    int sum = 0;
    for (String summand: expression.split("\\+"))
      sum += Integer.valueOf(summand);
    return sum;
  }
}

• CalculatorTest.java

javaCopy
import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class CalculatorTest {
  @Test
  public void evaluatesExpression() {
    Calculator calculator = new Calculator();
    int sum = calculator.evaluate("1+2+3");
    assertEquals(6, sum);
  }
}

• compile

textCopy
javac -cp .:junit-4.13.2.jar CalculatorTest.java

• run

textCopy
java -cp .:junit-4.13.2.jar:hamcrest-core-1.3.jar org.junit.runner.JUnitCore CalculatorTest

JUnit report

Maven report

xmlCopy
<project>
  ...
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-report-plugin</artifactId>
        <version>3.0.0-M5</version>
      </plugin>
    </plugins>
  </reporting>
  ...
</project>

• mvn site or mvn surefire-report:report
• from: https://maven.apache.org/surefire/maven-surefire-report-plugin/usage.html