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Questions tagged [junit]

Popular unit testing framework for Java and Scala. The latest version, JUnit 5, supports rich annotation-based and parameterized tests. Consider using in conjunction with the Java or Scala tag to indicate your use case.

JUnit is a popular unit testing framework for JVM languages (Java, Scala, Groovy, Kotlin, and others). The current version, JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage. Consider using in conjunction with the appropriate language tag (, , , and others) tag to indicate your use case. It is one of the most popular Java frameworks and is used in circa 30% of all projects.

The latest iteration, JUnit 5 (use tag ) adds Java 8 idioms, parameterized tests and comprehensive support for custom extensions.

There are JUnit implementations for other programming languages, which are called xUnit.

Kent Beck, Erich Gamma and David Saff created the unit testing framework influencing Java development heavily.

Grab JUnit's source code at GitHub or even fork it.

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How to test code dependent on environment variables using JUnit?

I have a piece of Java code which uses an environment variable and the behaviour of the code depends on the value of this variable. I would like to test this code with different values of the environment variable. How can I do this in JUnit? I've…
vitaut
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How to resolve Unneccessary Stubbing exception

My Code is as below, @RunWith(MockitoJUnitRunner.class) public class MyClass { private static final String code ="Test"; @Mock private MyClassDAO dao; @InjectMocks private MyClassService Service = new…
VHS
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Getting "Skipping JaCoCo execution due to missing execution data file" upon executing JaCoCo

I'm using Maven 3.0.3, JUnit 4.8.1, and Jacoco 0.6.3.201306030806, and I am trying to create test coverage reports. I have a project with unit tests only, but I can't get reports to run, I'm repeatedly getting the error: Skipping JaCoCo execution…
Dave
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When to use Mockito.verify()?

I write jUnit test cases for 3 purposes: To ensure that my code satisfies all of the required functionality, under all (or most of) the input combinations/values. To ensure that I can change the implementation, and rely on JUnit test cases to tell…
Russell
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Class Not Found: Empty Test Suite in IntelliJ

I'm just starting the computer science program at my college, and I'm having some issues with IntelliJ. When I try to run unit tests, I get the message Process finished with exit code 1 Class not found: "edu.macalester.comp124.hw0.AreaTest"Empty…
arnbobo
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Pass a local file in to URL in Java

How do I create a new URL object using a local file, for the purpose of unit tests?
MeanwhileInHell
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Spring Test & Security: How to mock authentication?

I was trying to figure out how to unit test if my the URLs of my controllers are properly secured. Just in case someone changes things around and accidentally removes security settings. My controller method looks like…
Martin Becker
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Warning: The method assertEquals from the type Assert is deprecated

Since the method Assert.assertEquals is deprecated, which method are we supposed to use now? The following code: String arg1 = "test"; String arg2 = "me"; Assert.assertEquals(arg1, arg2); Gives the following warnings: Multiple markers at this…
Brad Parks
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Configuring IntelliJ IDEA for unit testing with JUnit

I decided to try out IntelliJ this morning via the trial version and installed the JUnit plugin. I made a new Java project and I want to write a test case for it. How do I add the junit.jar file to my project? (I actually want to add it to every…
Bob
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Java verify void method calls n times with Mockito

I'm trying to verify that a (void) method is being called inside of a DAO - I'm using a commit point that sends a list of results up to that point, resets the list and continues. Say I have 4 things in the list and I have a commit point of 1, I…
nbpeth
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Mockito How to mock and assert a thrown exception?

I'm using mockito in a junit test. How do you make an exception happen and then assert that it has (generic pseudo-code)
stackoverflow
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How do I assert equality on two classes without an equals method?

Say I have a class with no equals() method, to which do not have the source. I want to assert equality on two instances of that class. I can do multiple asserts: assertEquals(obj1.getFieldA(), obj2.getFieldA()); assertEquals(obj1.getFieldB(),…
Ryan Nelson
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Mockito - NullpointerException when stubbing Method

So I started writing tests for our Java-Spring-project. What I use is JUnit and Mockito. It's said, that when I use the when()...thenReturn() option I can mock services, without simulating them or so. So what I want to do is, to…
user5417542
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JUnit confusion: use 'extends TestCase' or '@Test'?

I've found the proper use (or at least the documentation) of JUnit very confusing. This question serves both as a future reference and as a real question. If I've understood correctly, there are two main approaches to create and run a JUnit…
Rabarberski
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Initialising mock objects - Mockito

There are many ways to initialize a mock object using MockIto. What is best way among these ? 1. public class SampleBaseTestCase { @Before public void initMocks() { MockitoAnnotations.initMocks(this); …
Vinay Veluri
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