Tag Archives: assertEquals

how to use assertions in junit ? part 1

What is assertion?

 

An assertion is a statement in the Java programming language that enables you to test your assumptions about your program. For example, if you write a method that calculates the speed of a particle, you might assert that the calculated speed is less than the speed of light.

Each assertion contains a boolean expression that you believe will be true when the assertion executes. If it is not true, the system will throw an error. By verifying that the boolean expression is indeed true, the assertion confirms your assumptions about the behavior of your program, increasing your confidence that the program is free of errors.

Experience has shown that writing assertions while programming is one of the quickest and most effective ways to detect and correct bugs. As an added benefit, assertions serve to document the inner workings of your program, enhancing maintainability.

 

Lets have a look for simple Example with jUnit:

Condition : expected = actual

LearnAssertions.java

package myWorkjUnit;

import junit.framework.Assert;

import org.junit.Test;

public class LearnAssertions {

@Test
 public void testAdvertisingPrograms(){
 System.out.println("open browser and go to URL");
 System.out.println("click on link");
 System.out.println("click on one Login link");

 String actual = "actual";
 String expected = "actual";

// if("ElementLocation" == "ElementLocation from above statement"){
// System.out.println("Pass");
// }else{
// System.out.println("fail");
// report Error
// }


 Assert.assertEquals(expected, actual);

 }

}

Condition : expected != actual

package myWorkjUnit;

import junit.framework.Assert;

import org.junit.Test;

public class LearnAssertions {

@Test
 public void testAdvertisingPrograms(){
 System.out.println("open browser and go to URL");
 System.out.println("click on link");
 System.out.println("click on one Login link");

 String actual = "actual";
 String expected = "expected";

// if("ElementLocation" == "ElementLocation from above statement"){
// System.out.println("Pass");
// }else{
// System.out.println("fail");
// report Error
// }


 Assert.assertEquals(expected, actual);

 }

}

how to use assertion in testng ? – Assert (TestNG)

Refer Assert (TestNG) 

 

 

Sample Method Detail

assertTrue
assertFalse
assertEquals

 

Example 1 : what happen when assertion fail using  assertEquals ?

 

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

 @Test
 public void testMultiply() {

 Assert.assertEquals(50, multiply(10, 5));
 }


 public int multiply(int x, int y) {
 return x / y;
 }

}

 

Run above code using testNG and check TestNG result pane

assertEquals

assertEquals

 

 

Example 2 : what happen when assertion success using  assertEquals ?

 

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

 @Test
 public void testMultiply() {

 Assert.assertEquals(2, multiply(10, 5));
 }


 public int multiply(int x, int y) {
 return x / y;
 }
}

Condition when success

Condition when success

Example 3: what happen when assertion success using  assertTrue?

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

 @Test
 public void testMultiply() {

 Assert.assertTrue(multiply(10, 5)!=20, "Sorry");
 }


 public int multiply(int x, int y) {
 return x / y;
 }

}

 

what happen when assertion success using  assertTrue

what happen when assertion success using assertTrue

 

 

Example 4: what happen when assertion fail using  assertTrue?

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

 @Test
 public void testMultiply() {

 Assert.assertTrue(multiply(10, 5)!=2, "Sorry");
 }


 public int multiply(int x, int y) {
 return x / y;
 }

}
what happen when assertion fail using  assertTrue

what happen when assertion fail using assertTrue

 

Example 4: what happen when assertion success using  assertFalse?

 

package testWordpress;

import org.testng.Assert;
import org.testng.annotations.Test;

public class AssertionsTest {

 @Test
 public void testMultiply() {

 Assert.assertFalse(multiply(10, 5)>10, "Caught");
 }


 public int multiply(int x, int y) {
 return x / y;
 }
}

what happen when assertion success using  assertFalse

what happen when assertion success using assertFalse

 

Lets add TestCase with assertion in testng.xml and verify testNG html report

 

<test name="test4">
 <classes>
 <class name="testWordpress.AssertionsTest" ></class>
 </classes>
</test>

 

 

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