Let us take a look at how to test exceptions using Junit.
Calculation.javapackage org.code2care;
public class Calculation {
public int divide(int no1, int no2) {
return no1 / no2;
}
public void numberToString(int no) {
System.out.println("The no. entered is: " + Integer.toString(no));
}
}
CalculationClient.java
package org.code2care;
public class CalculationClient {
public static void main(String[] args) {
Calculation cal = new Calculation();
Integer no1 = 20;
Integer no2 = 10;
System.out.println(cal.divide(no1, no2));
cal.numberToString(no2);
}
}
We have two methods division that can throw ArithmeticException and numberToString that can throw a NullPointerException
Let's write test cases in Java JUnit to test these exceptions.
CalculationTest.javapackage myprog;
import org.code2care.Calculation;
import org.junit.Test;
/**
*
* JUnit test cases for
* testing exceptions
*
* @author code2care
*
*/
public class CalculationTest {
@Test(expected = ArithmeticException.class)
public void divideTwoNumbersArithmeticExceptionTest() {
Calculation calculation = new Calculation();
int no1 = 20;
int no2 = 0;
calculation.divide(no1, no2);
}
@Test(expected = NullPointerException.class)
public void noToStringNullPointerExceptionText() {
Calculation calculation = new Calculation();
Integer no1 = null;
calculation.numberToString(no1);
}
}
![JUnit test cases in Java to test Exceptions Results JUnit test cases in Java to test Exceptions Results](https://code2care.org/java/test-exceptions-using-java-junit-test-cases/images/JUnit test cases in Java to test Exceptions Results.png)
Facing issues? Have Questions? Post them here! I am happy to answer!
Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
Follow him on: X
You can also reach out to him via e-mail: rakesh@code2care.org
More Posts related to Java,
- Get the current timestamp in Java
- Java Stream with Multiple Filters Example
- Java SE JDBC with Prepared Statement Parameterized Select Example
- Fix: UnsupportedClassVersionError: Unsupported major.minor version 63.0
- [Fix] Java Exception with Lambda - Cannot invoke because object is null
- 7 deadly java.lang.OutOfMemoryError in Java Programming
- How to Calculate the SHA Hash Value of a File in Java
- Java JDBC Connection with Database using SSL (https) URL
- How to Add/Subtract Days to the Current Date in Java
- Create Nested Directories using Java Code
- Spring Boot: JDBCTemplate BatchUpdate Update Query Example
- What is CA FE BA BE 00 00 00 3D in Java Class Bytecode
- Save Java Object as JSON file using Jackson Library
- Adding Custom ASCII Text Banner in Spring Boot Application
- [Fix] Java: Type argument cannot be of primitive type generics
- List of New Features in Java 11 (JEPs)
- Java: How to Add two Maps with example
- Java JDBC Transition Management using PreparedStatement Examples
- Understanding and Handling NullPointerException in Java: Tips and Tricks for Effective Debugging
- Steps of working with Stored Procedures using JDBCTemplate Spring Boot
- Java 8 java.util.Function and BiFunction Examples
- The Motivation Behind Generics in Java Programming
- Get Current Local Date and Time using Java 8 DateTime API
- Java: Convert Char to ASCII
- Deep Dive: Why avoid java.util.Date and Calendar Classes
More Posts:
- PowerShell: Check if File Exists - Powershell
- How to Start Jupyter Notebook on Mac - MacOS
- Spell check not working in Gmail : Mac OS X - Mac-OS-X
- YAML Parser using Java Jackson Library Example - Java
- Share Story Feed on Facebook using URL - Facebook
- Disable jQuery button after being click - jQuery
- Java: Convert Char to ASCII - Java
- Time Testing with Java JUnit assertTimeout method - Java