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This article focuses on "how to use unit testing in Java5". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use unit testing in Java5.

1. JUnit4 uses the notes in Java5 (annotation)

Before: initialization methods are executed once for each test method (note the difference from BeforeClass, which is executed once for all methods)

After: releasing resources is executed once for each test method (note the difference from AfterClass, which is executed once for all methods)

@ Test: test method, where you can test expected exceptions and timeouts

@ Test (expected=ArithmeticException.class) checks whether the method under test throws an ArithmeticException exception

@ Ignore: ignored test method

@ BeforeClass: execute only once for all tests, and must be static void

@ AfterClass: execute only once for all tests, and must be static void

The execution order of a unit test case for a JUnit4 is:

@ BeforeClass-> @ Before-> @ Test-> @ After-> @ AfterClass

The order in which each test method is called is:

@ Before-> @ Test-> @ After

2. Execution order

Random execution

@ FixMethodOrder (MethodSorters.DEFAULT)

Public class TestOrder

Execute in order of testcase name string

@ FixMethodOrder (MethodSorters.NAME_ASCENDING)

Public class TestOrder

3. Code injection Mock

The difference between @ Mocked and @ Injectable in JMokit

Public class CommonDaoTest {

@ Mock

Private MongoTemplate mongoTemplate; / / injects the mongdb mock class without accessing the library

The target class of @ InjectMocks / / injection, the test class to be implemented

Private CommonDao commonDao

@ Before

Public void setUp () {

MockitoAnnotations.initMocks (this); / / be sure to add it here, or there will be an error.

}

@ Test

Public void dropCollectionName () {

DoNothing () .when (mongoTemplate) .dropCollection

CommonDao.dropCollectionName / / CommonDao implements the function of deleting documents

}

}

Org.jmockit

Jmockit

1.23

Test

4. Various mock examples

When (systemConfigurationService.getConfiguration (eq (String.class), anyString () .thenReturn ("(\\ d+\\. *\\ d*)")

When (objService.getKnowledgePointList (anyList () .thenReturn (objectiveKnowledges)

When (mongoTemplate.updateFirst (any (Query.class), any (Update.class), anyString ()) .thenReturn (mock (WriteResult.class))

When (mongoTemplate.collectionExists ("111")) .thenReturn (false)

When (configRepository.findByType (anyString () .thenReturn (mock (Config.class))

At this point, I believe you have a deeper understanding of "the use of unit testing in Java5". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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