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
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How do I test a class that has private methods, fields or inner classes?
How do I use JUnit to test a class that has internal private methods, fields or nested classes?
It seems bad to change the access modifier for a method just to be able to run a test.
4
votes
1
answer
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Why are my mocked methods not called when executing a unit test?
Preface:
This question and answer are intended as a canonical answer to
the majority of questions that arise due to misuse of Mockito or
misunderstanding how Mockito works and interacts with unit ...
- 261k
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answers
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How do you assert that a certain exception is thrown in JUnit tests?
How can I use JUnit idiomatically to test that some code throws an exception?
While I can certainly do something like this:
@Test
public void testFooThrowsIndexOutOfBoundsException() {
boolean ...
- 58.7k
449
votes
15
answers
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JUnit test for System.out.println()
I need to write JUnit tests for an old application that's poorly designed and is writing a lot of error messages to standard output. When the getResponse(String request) method behaves correctly it ...
- 8,366
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answers
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How to run JUnit test cases from the command line
I would like to run JUnit test cases from the command line.
How can I do this?
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answers
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How to run test methods in specific order in JUnit4?
I want to execute test methods which are annotated by @Test in specific order.
For example:
public class MyTest {
@Test public void test1(){}
@Test public void test2(){}
}
I want to ensure ...
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390
votes
29
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How to mock a final class with mockito
I have a final class, something like this:
public final class RainOnTrees{
public void startRain(){
// some code here
}
}
I am using this class in some other class like this:
public ...
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Conditionally ignoring tests in JUnit 4
OK, so the @Ignore annotation is good for marking that a test case shouldn't be run.
However, sometimes I want to ignore a test based on runtime information. An example might be if I have a ...
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304
votes
25
answers
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Injecting Mockito mocks into a Spring bean
I would like to inject a Mockito mock object into a Spring (3+) bean for the purposes of unit testing with JUnit. My bean dependencies are currently injected by using the @Autowired annotation on ...
- 15.4k
2
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java DateTimeFormatterBuilder fails on testtime [duplicate]
I have a simple jUnit test for DateTimeFormatterBuilder.
At runtime it works, when some String comes on Spring-MVC hanlder (@RequestParam)
At testtime it fails with the same String value.
Tested ...
552
votes
35
answers
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Maven does not find JUnit tests to run
I have a maven program, it compiles fine. When I run mvn test it does not run any tests (under TESTs header says There are no tests to run.).
I've recreated this problem with a super simple setup ...
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Running junit tests in parallel in a Maven build?
I'm using JUnit 4.4 and Maven and I have a large number of long-running integration tests.
When it comes to parallelizing test suites there are a few solutions that allow me to run each test method ...
- 76.5k
532
votes
12
answers
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JUnit 5: How to assert an exception is thrown?
Is there a better way to assert that a method throws an exception in JUnit 5?
Currently, I have to use an @Rule in order to verify that my test throws an exception, but this doesn't work for the ...
- 7,187
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votes
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How to test methods that call System.exit()?
I've got a few methods that should call System.exit() on certain inputs. Unfortunately, testing these cases causes JUnit to terminate! Putting the method calls in a new Thread doesn't seem to help, ...
- 55.8k
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When do Java generics require <? extends T> instead of <T> and is there any downside of switching?
Given the following example (using JUnit with Hamcrest matchers):
Map<String, Class<? extends Serializable>> expected = null;
Map<String, Class<java.util.Date>> result = null;
...
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