![]() In this section first we wee see a simple example of using the annotation. The Captor annotation is defined as below: Captor One of the advantages of using annotation is that you can avoid warnings related capturing complex generic types. Captor annotationĬaptor annotation allows shorthand ArgumentCaptor creation on fields. Use it in case the verified method was called multiple times. Returns the captured value of the argument. If the method was called multiple times then it returns the latest captured value. This argument matcher stores the argument value so that you can use it later to perform assertions. This method must be used inside of verification. Internally, this method registers a special implementation of an ArgumentMatcher. In this section we will describe the methods defined in the ArgumentCaptor class. you just need it to assert on argument values to complete verificationĬustom argument matchers via ArgumentMatcher are usually better for stubbing.custom argument matcher is not likely to be reused. ![]() However, ArgumentCaptor may be a better fit if: In a way ArgumentCaptor is related to custom argument matchers. Both techniques can be used for making sure certain arguments where passed to mocks. Also it may reduce defect localization because if stubbed method was not called then no argument is captured. Using ArgumentCaptor with stubbing may decrease test readability because captor is created outside of assert (aka verify or ‘then’) block. It is recommended to use ArgumentCaptor with verification but not with stubbing. Verify(mockClass).doSomething(argument.capture()) ĪssertEquals("Meraj", argument.getValue().getName()) In some situations though, it is helpful to assert on certain arguments after the actual verification. For example: ArgumentCaptor argument = ArgumentCaptor.forClass(Contact.class) Then click ok.ĪrgumentCaptor class is used to capture argument values for further assertions. Mockito verifies argument values in natural java style: by using an equals() method. This is also the recommended way of matching arguments because it makes tests clean & simple. Then go to the location where you have downloaded these jars. The click on the ‘Add External JARs’ button on the right hand side. To add these jars in the classpath right click on the project and choose Build Path=>Configure Build Path. There are the latests (non-beta) versions available as per now. These jars can be downloaded from Maven repository. Eclipse will create a default class with the given name.įor this example we need the junit and mockito jars. Give the class name as MockitoCaptorExample. Right click on the package and choose New=>Class.In the ‘Name’ text-box enter ‘com.javacodegeeks’. Right click on the ‘src’ folder and choose New=>Package. In the ‘Project name’ enter ‘MockitoCaptorExample’. Creating a projectīelow are the steps we need to take to create the project. In production a real database is used, but for testing a mock object simulates the database and ensures that the test conditions are always the same. jMock etc. Mock frameworks allow us to create mock objects at runtime and define their behavior. The classical example for a mock object is a data provider. Using Mockito simplifies the development of tests for classes with external dependencies significantly. We can create the mock objects manually or can use the mocking framewors like Mockito, EasyMock. Mockito allows us to create and configure mock objects. Mockito is a popular mocking framework which can be used in conjunction with JUnit. Tools and technologies used in this example are Java 1.8, Eclipse Luna 4.4.2 1. In this example we will learn how to use ArgumentCaptor class/ Captor annotation of Mockito. Mockito lets you write beautiful tests with a clean & simple API. Side effects from other classes or the system should be eliminated if possible. A unit test should test a class in isolation.
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