EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 600+ Courses All in One Bundle
  • Login
Home Software Development Software Development Tutorials JUnit Tutorial JUnit Assert
Secondary Sidebar
JUnit Tutorial
  • Junit
    • JUnit 5 Assert
    • JUnit RunWith
    • JUnit AssertThat
    • JUnit Report
    • JUnit BeforeClass
    • JUnit Framework
    • JUnit Data Provider
    • JUnit Runner
    • JUnit 5 Parameterized Tests
    • JUnit BeforeAll
    • JUnit Private Methods
    • JUnit Integration Test
    • JUnit Maven Dependency
    • JUnit Annotations?
    • JUnit Testing
    • JUnit Test Order
    • JUnit 5 RunWith
    • JUnit 4 Maven
    • JUnit Jar
    • JUnit assertEquals
    • JUnit 5 Parameterized Test
    • JUnit Dependency
    • JUnit Fail
    • JUnit Disable Test
    • JUnit Assert
    • JUnit in Maven
    • JUnit 5 Gradle
    • JUnit XML
    • JUnit XML Format
    • JUnit Eclipse
    • JUnit Test Suite
    • JUnit Parameterized Test
    • JUnit assert exception
    • JUnit Code Coverage
    • JUnit Jupiter
    • JUnit Rule
    • JUnit version
    • Junit Interview Questions

JUnit Assert

JUnit Assert

Definition of JUnit Assert

It is a method that was used for determining the pass and fail status of the test cases. This method was provided by class name as org.JUnit.Assert which was used to extend the java.lang.Object class. There are multiple types of assertions available in JUnit like null, identical, and Boolean. Basically, JUnit is providing the class name as assert which is providing the methods of assertion.

Overview of JUnit Assert

  • Basically, JUnit is providing the class method name as assert which will provide the bunch of assertion methods which was useful in writing the test cases and used to detect the test.
  • It is the utility used for supporting the assert condition in a test. All the methods are accessible through the class of assert. The class of assert is accessible in the version of JUnit4 and assertions are accessible in JUnit5.
  • To increase the readability of the test and assertions we are using JUnit. We need to import the respective class statistically.

Using JUnit Assert

  • In the version of JUnit4, the library of assertions will be available for all primitive data types. Arrays and objects are available in JUnit4 assertions.
  • The order of parameters within the assertion is the value expected and followed by the actual value. The first parameter optional message is which represents the output of the message.
  • We can say that assert is the API of JUnit or function of the library on which we can verify if a particular condition or logic will return either true or false at the time of execution of the test. If suppose the value will return false, then the error of assertion will throw.
  • It is an important feature that was used to do good unit testing. We can say that it helps us for validating the actual output with the expected output for a specified test case that we have defined in the application.
  • Writing the JUnit assert is a very effective and fast way to fix and detect bugs. It will give us confidence that our assumptions on a particular condition are right.
  • Many times assertion will work as a precondition of a function call or it also works in the condition. The JUnit 4 and JUnit 5 will contain different classes which contain different methods.
  • JUnit 4 will contain all assert methods within the class of assert while JUnit 5 contains all assert methods within the assertion class.
  • The package of JUnit 5 is imported by using org.JUnit.jupiter.api.assertions and the package of JUnit 4 is imported by using org.JUnit.assert.

In the below example, we are using the JUnit 4 assert class. In the below example we are using the @Test method to test the classes. In the below example we are using JUnit 4 assert so we are using package name as org.JUnit.assert.

Code –

public class JUnit_assert {
@Test
public void test () {
fail ("Test case is failing");
}
}

666

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

j

JUnit Assert Methods

  • This class provides a number of assertion methods, which are useful for writing the test cases. We are recording only failed assertions by using this method. In JUnit, all the assertions contain the assert class.
  • At the time of testing applications by using assert methods we are using the fail method to test the application.

Below are the method available as follows.

All in One Software Development Bundle(600+ Courses, 50+ projects)
Python TutorialC SharpJavaJavaScript
C Plus PlusSoftware TestingSQLKali Linux
Price
View Courses
600+ Online Courses | 50+ projects | 3000+ Hours | Verifiable Certificates | Lifetime Access
4.6 (86,754 ratings)
  • Void assertEquals – This method is used to check whether the two objects are equal or not. This method contains the actual and expected boolean object.
  • Void assertTrue – This method is used to check the true condition. This method contains the boolean condition object.
  • Void assertFalse – This method is used to check the false condition. This method contains the boolean condition object.
  • Void assertNotNull – This method is used to check the object is not null. This method contains the object condition.
  • Void assertNull – This method is used to check the object is null. This method contains the object condition.
  • Void assertSame – This method will test the two object references which point to the same object. This method contains two objects.
  • Void assertNotSame – This method will test the two object reference which is not pointing to the same object. This method contains two objects.
  • Void assertArrayEquals – This method is used to check whether our two arrays is equal to each other or not. This method contains the actual and expected array object.

JUnit assert Example

  • The below example shows JUnit’s assert example as follows. We are creating the project name as JUnit_assert.
  • In this step, we are creating the project template in spring boot. We have provided project group name as com. example, artifact name as JUnitassert, project name as JUnitassert, and selected java version as 11. We are defining the version of spring boot as 2.6.7.

Group – com.example                        Artifact name – JUnitassert

Name – JUnitassert                             Spring boot – 2.6.7

Project – Maven                                  Java – 11

Package name – com.example. JUnitassert

Project Description – Project for JUnitassert

hh

  • In this step, we are extracting the downloaded project and opening the same by using the spring tool suite.

kk

  • In this step, we are checking all project structures and their files are as follows. Also, we are checking whether that pom.xml file is created or not.

ll

  • Add the JUnit dependency in JUnit assert project. We are adding JUnit dependency as follows.

Code:

<dependency>
<groupId> org.JUnit.jupiter </groupId>
<artifactId> JUnit-jupiter-engine </artifactId>
<version> 5.3.1 </version>
<scope> JUnit-assert </scope>
</dependency>

addd

  • The below example shows the equal method as follows.

Code:

public class JUnitassert1 {
@Test
public void test () {
int p=115;
int q=20;
int del=25;
assertEquals ("P value: "+p+ " Q value "+q+ " Difference:"+del, p, q, del);
}
}

JUnit Assert code 1
JUnit Assert code

  • The below example shows the false method as follows.

Code:

public class JUnitassert1 {
@Test
public void test() {
int p=10;
boolean val;
if(p<20) {
val=true;
}
else {
val=false;
}
assertFalse (val);
}
}

JUnit Assert ar
JUnit Assert sss

Conclusion

It is the utility used for supporting the assert condition in a test. All the methods are accessible through the class of assert. This is a method that was provided by class name as org.JUnit.Assert which was used to extend the java.lang.Object class.

Recommended Articles

This is a guide to JUnit Assert. Here we discuss the Definition, overviews, how to use, methods, and examples with code implementation. You may also have a look at the following articles to learn more –

  1. JUnit Code Coverage
  2. JUnit assert exception
  3. JUnit Jupiter
  4. JUnit assertEquals
0 Shares
Share
Tweet
Share
Primary Sidebar
Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Java Tutorials
  • Python Tutorials
  • All Tutorials
Certification Courses
  • All Courses
  • Software Development Course - All in One Bundle
  • Become a Python Developer
  • Java Course
  • Become a Selenium Automation Tester
  • Become an IoT Developer
  • ASP.NET Course
  • VB.NET Course
  • PHP Course

ISO 10004:2018 & ISO 9001:2015 Certified

© 2022 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA
Free Software Development Course

C# Programming, Conditional Constructs, Loops, Arrays, OOPS Concept

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more