JUnit - Beginner

Notes, Samples for JUnit.

Sample 1

Class to be tested:

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package test;

public class Calculator {
public static int add(int num1, int num2) {
return num1 + num2;
}

public static int sub(int num1, int num2) {
return num1 - num2;
}
}

Test Case:

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package test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;

import org.junit.Test;

public class CalculatorAddTest {

@Test
public void pass() {
assertEquals("Error in add()-1..", 3, Calculator.add(1, 2));
assertEquals("Error in add()-2..", -3, Calculator.add(-1, -2));
assertEquals("Error in add()-3..", -1, Calculator.add(-1, -2));
}

@Test
public void fail() {
assertNotEquals("Error in add()-4..", 0, Calculator.add(1, 2));
}

}

Run this by: Run As - JUnit Test

Test Standalone or Test Runner

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package test;

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class RunTestStandalone {
public static void main(String[] args) {
Result result = JUnitCore.runClasses(CalculatorAddTest.class);
for (Failure failure : result.getFailures()) {
System.out.println(failure.toString());
}
System.out.println("Result Pass? : " + result.wasSuccessful());
}
}

Run this by: Run As - Java Application

Test Suite

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import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;

@RunWith(Suite.class)
@SuiteClasses({ CalculatorAddTest.class, CalculatorSubTest.class })
public class AllTests {

}

Run this by: Run As - JUnit Test

Sample 2

Testing class:

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public class Animal {
String name;
double speed;

public Animal(String name, double speed) {
this.name = name;
this.speed = speed;
}

public String getName() {
return name;
}

public double getSpeed() {
return speed;
}

public double walkSpeed () {
return speed;
}

public double runSpeed() {
return speed*2;
}
}

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