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
28,065
questions
3229
votes
59
answers
1.3m
views
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.
2310
votes
35
answers
2.0m
views
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
947
votes
7
answers
659k
views
How to verify that a specific method was not called using Mockito?
How to verify that a method is not called on an object's dependency?
For example:
public interface Dependency {
void someMethod();
}
public class Foo {
public bar(final Dependency d) {
...
- 12.5k
552
votes
35
answers
493k
views
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 ...
- 22.5k
532
votes
12
answers
794k
views
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
524
votes
7
answers
392k
views
Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll
What is the main difference between
@Before and @BeforeClass
and in JUnit 5 @BeforeEach and @BeforeAll
@After and @AfterClass
According to the JUnit Api @Before is used in the following case:
...
- 18.5k
509
votes
11
answers
391k
views
Mockito: Trying to spy on method is calling the original method
I'm using Mockito 1.9.0. I want mock the behaviour for a single method of a class in a JUnit test, so I have
final MyClass myClassSpy = Mockito.spy(myInstance);
Mockito.when(myClassSpy.method1())....
- 17.4k
499
votes
8
answers
989k
views
Mockito : how to verify method was called on an object created within a method?
I am new to Mockito.
Given the class below, how can I use Mockito to verify that someMethod was invoked exactly once after foo was invoked?
public class Foo
{
public void foo(){
Bar bar =...
- 44k
478
votes
22
answers
497k
views
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 ...
- 31.8k
457
votes
20
answers
617k
views
How to test that no exception is thrown?
I know that one way to do it would be:
@Test
public void foo() {
try {
// execute code that you expect not to throw Exceptions.
} catch(Exception e) {
fail("Should not have ...
- 6,824
449
votes
15
answers
379k
views
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
449
votes
11
answers
204k
views
Why doesn't JUnit provide assertNotEquals methods?
Does anybody know why JUnit 4 provides assertEquals(foo,bar) but not assertNotEqual(foo,bar) methods?
It provides assertNotSame (corresponding to assertSame) and assertFalse (corresponding to ...
- 9,199
441
votes
2
answers
594k
views
How to verify a method is called two times with mockito verify()
I want to verify if a method is called at least once through mockito verify. I used verify and it complains like this:
org.mockito.exceptions.verification.TooManyActualInvocations:
Wanted 1 time:
...
- 4,485
416
votes
5
answers
147k
views
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 ...
- 103k
407
votes
9
answers
234k
views
How to capture a list of specific type with mockito
Is there a way to capture a list of specific type using mockitos ArgumentCaptore. This doesn't work:
ArgumentCaptor<ArrayList<SomeType>> argument = ArgumentCaptor.forClass(ArrayList.class)...
- 110k