Sometimes our methods throw exceptions and we want to mock the object and test the exceptions. We can use Mockito mock objects with when() and thenThrow() to mock this scenario. Mockito Stub Exception – JUnit 5 Let’s see a simple example where we will mock our object method to throw an exception. Then we will […]
JUnit Assert Exception – JUnit 5 and JUnit 4
We can test expected exceptions using JUnit 5 assertThrows assertion. This JUnit assertion method returns the thrown exception, so we can use it to assert exception message too. JUnit Assert Exception Here is a simple example showing how to assert exception in JUnit 5. String str = null; assertThrows(NullPointerException.class, () -> str.length()); JUnit 5 Assert […]
JUnit vs TestNG
JUnit and TestNG are the most popular testing frameworks for Java applications. Both of these frameworks are really good and easy to use. So when it comes to chose the testing framework for your application, it’s better to have a high-level idea of what features are present in one or the other and then take […]
JUnit Annotations
JUnit testing framework is built on annotations. JUnit 5 is a major upgrade from JUnit 4. There are different modules and we need JUnit Platform and JUnit Jupiter API to create and run the test cases for our java project. JUnit Annotations Let’s look at the most important annotations in JUnit 5 Jupiter API. Most […]
JUnit 5 Nested Tests
JUnit Jupiter @Nested annotation can be used to mark a nested class to be included in the test cases. When JUnit tests are executed, Nested classes are not scanned for test methods. We can explicitly mark them to be scanned for test cases using @Nested annotation. JUnit 5 Nested Tests JUnit Nested test classes should […]
JUnit 5 Dynamic Tests – @TestFactory, DynamicTest
JUnit @TestFactory annotation coupled with DynamicTest can be used to create a test factory method. JUnit Dynamic Tests JUnit @TestFactory methods must not be private or static. These methods must return a Stream, Collection, Iterable, or Iterator of DynamicNode instances. Any Stream returned by a @TestFactory will be properly closed by calling stream.close(), making it […]
JUnit Setup Maven – JUnit 4 and JUnit 5
JUnit 4 and JUnit 5 are completely different frameworks. They both serve the same purpose, but the JUnit 5 is a completely different testing framework written from scratch. It’s not using anything from JUnit 4 APIs. Here we will look into how to setup JUnit 4 and JUnit 5 in our maven projects. JUnit Maven […]
JUnit HTML Report
When we configure maven-surefire-plugin to run our JUnit tests, it generates surefire-reports directory. This directory contains a txt file and an XML file for every test class. However, reading these files is not easy and it’s also not easily explainable to a non-techie person. JUnit HTML Report We can use maven-surefire-report-plugin plugin to generate HTML […]
JUnit Disable Enable Tests
JUnit 5 Jupiter API provides various ways to disable or enable a test. There are various annotations to help us easily disable/enable tests based on OS, JRE, System properties etc. We can also execute a script to enable or disable a test. Let’s look at various JUnit annotations to enable and disable a test. JUnit […]
JUnit Assumptions
JUnit Assumptions helps us in skipping a test for some specific scenario. Sometimes our test cases are dependent on the inputs, operating systems or any third party data. If our test is not written for some specific inputs, then we can use assumptions to skip our test method. JUnit Assumptions JUnit Jupiter Assumptions class provide […]