junit – Tarik Billa

How to make JUnit test cases execute in parallel? [duplicate]

December 28, 2023 by Tarik

Junit4 provides parallel feature using ParallelComputer: public class ParallelComputerTest { @Test public void test() { Class[] cls={ParallelTest1.class,ParallelTest2.class }; //Parallel among classes JUnitCore.runClasses(ParallelComputer.classes(), cls); //Parallel among methods in a class JUnitCore.runClasses(ParallelComputer.methods(), cls); //Parallel all methods in all classes JUnitCore.runClasses(new ParallelComputer(true, true), cls); } public static class ParallelTest1 { @Test public void a(){} @Test public void b(){} … Read more

How to use Hamcrest to inspect Map items

December 13, 2023 by Tarik

Youu could just use contains or containsInAnyOrder. True, you’ll have to list all items in the List that way, but it works cleaner than hasItem: @SuppressWarnings(“unchecked”) @Test public void mapTest() { Map<String, List<MyItem>> map = new HashMap<String, List<MyItem>>(); map.put(“one”, asList(new MyItem(“1”), new MyItem(“one”))); assertThat(map, hasEntry(is(“one”), containsInAnyOrder(hasProperty(“name”, is(“one”)), hasProperty(“name”, is(“1”))))); }

AssertJ: For a Pojo how to check each nested Property/Field in one chained sentence

September 9, 2023 by Tarik

I think the best way is to extract all the properties/fields and then checks it does not contain null. Example: TolkienCharacter frodo = new TolkienCharacter(“Frodo”, 33, HOBBIT); // support nested properties: assertThat(frodo).extracting(“name”, “age”, “race.name”) .doesNotContainNull() .containsExactly(“Frodo”, 33, “Hobbit”); Note that you can also use lambdas to extract values from the object under test. assertThat(frodo).extracting(TolkienCharacter::getName, character … Read more

jUnit: How to determine level of code coverage?

August 17, 2023 by Tarik

I’ve used EclEmma very successfully to cover JUnit test runs. And its free.

The differences between JUnit 3 and JUnit 4 [closed]

June 14, 2023 by Tarik

Java 5 annotations for setup and teardown (@before and @after) instead of setUp() and tearDown(). don’t need to extend TestCase anymore. @Test annotation replaces testSomeMethod() naming convention. static imports for asserts. Junit theories, which allow you to separate data sets from the test itself.

Javadoc in JUnit test classes?

May 27, 2023 by Tarik

I use Javadoc in my testing a lot. But it only gets really useful when you add your own tag to your javadoc. The main objective here is to make the test understandable for other developers contributing to your project. And for that we don’t even need to generate the actual javadoc. /** * Create … Read more

How do I use Mockito to mock a protected method?

April 20, 2023 by Tarik

This is not an issue with Mockito, but with plain old java. From where you are calling the method, you don’t have visibility. That is why it is a compile-time issue instead of a run-time issue. A couple options: declare your test in the same package as the mocked class change the visibilty of the … Read more

@RunWith(SpringRunner.class) vs @RunWith(MockitoJUnitRunner.class)

April 13, 2023 by Tarik

The SpringRunner provides support for loading a Spring ApplicationContext and having beans @Autowired into your test instance. It actually does a whole lot more than that (covered in the Spring Reference Manual), but that’s the basic idea. Whereas, the MockitoJUnitRunner provides support for creating mocks and spies with Mockito. However, with JUnit 4, you can … Read more

PowerMock testing – set static field of class

April 10, 2023 by Tarik

Whitebox.setInternalState(Foo.class, b); Works as long as you set a non-null value, and if theres only one field with the class of B. If you can’t rely on that luxury, you have to provide the field-name and cast the null to the type you want to set. In that case you would need to write something … Read more

Run parallel test task using gradle

April 3, 2023 by Tarik

The accepted answer above works but the Gradle documentation here suggests you use maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: 1 I tried both and after testing both on a 2.3 GHz Intel Core i7 Mac Book Pro with 16GB RAM (4 cores with hyperthreading) test { maxParallelForks = Runtime.runtime.availableProcessors() } and test { maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: … Read more