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Mockito Tutorial


Mockito is a Java-based mocking framework used for unit testing Java applications. It’s similar to Roboelectric but easier to understand and use because it uses annotations to specify the behaviour of the test code. This tutorial will explain the basics of mockito and show you how to use it.

Mockito is a Java-based mocking framework used for unit testing of Java applications.

Mockito is a Java-platform framework that helps developers create mock objects for use during unit testing. It works similarly to JUnit but is much easier to use. Mockito allows you to write a test, run it, and check the results in a single step. JUnit provides more options when setting up the environment and checking test results, and Mockito offers a more intuitive way to write tests.

Mockito is free and open-source software. The framework allows you to create double-test objects for automated unit tests. The name “Mockito” is a play on the word “mojito” and reflects the company’s open-source nature. Mockito can be used for multiple test methods and customized for individual tests.

Mocking is a critical component in unit testing. It allows developers to test software at an early stage in the SDLC. By utilizing mocks, developers can ensure that their code is error-free and works as intended. The technique is a great way to discover bugs early in the SDLC.

It is similar to Roboelectric.

Mockito is similar to Robolectric in that both are open-source tools. Moreover, both tools support annotations and lint tests, which is very useful when writing automated tests for Android applications. The speed with which you can write and run tests is also a significant factor in these frameworks. The speed with which you can write and execute tests ensures that you can have meaningful iterations in your code.

Roboelectric is more potent than Espresso and can exercise the UI in many errors and edge cases. It also allows you to test fragments or activities in isolation, which is helpful if your application contains many different screens. However, Roboelectric is very heavy and takes some time to set up. You should run it after running pure unit tests to avoid affecting performance.

Robolectric allows you to run tests on your workstation or continuous integration environments without emulators. This way, you can reduce your test cycles from minutes to seconds. Another great feature of this tool is that it simulates native Dalvik calls on the JVM. This helps developers achieve proper TDD and unit testing with their apps.

It makes unit testing easier to understand

Mockito is a Java-based mocking framework that provides a standardized and simple way to create test APIs. It can be used with various frameworks to automate and simplify unit testing. Its underlying frameworks are based on mocks created at runtime and support exceptions.

Mockito injects mocks into classes and methods through the constructor, setter, and property injection. It also includes ArgumentCaptor classes, which can access arguments during method verification. These arguments can then be used for tests. Another Mockito feature is the “thenReturn” class, which returns a predefined value every time a method is invoked.

The Mockito framework supports database stubs, which simulate database-backed scenarios in test code without using a real one. Mockito also allows you to apply spies to an ApplicationContext to mimic existing objects. The mocks guarantee that business logic will be properly executed by replacing the actual object with an equivalent.

It uses annotations to specify the behaviour of the test code.

Mockito uses annotations to specify what the test code should do, which makes the code more readable. It also validates the configuration by returning the appropriate values depending on the arguments. There are several different ways to use annotations with Mockito. First, you can use the openMocks() method to bootstrap the mockito framework programmatically.

The default answer of Mockito is RETURNS_SMART_NULLS, which avoids the NullPointerException and provides a better stack trace. Another option is RETURNS_MOCKS, which first tries to return ordinary “empty” values. If this fails, it will return mocks instead.

Another helpful feature of Mockito is its ability to verify interactions within a specified time frame. Using this annotation, you can force a mock object to execute in a particular order, which will fail if it has not yet performed the interaction. This is very useful when testing multi-threaded systems. It is also helpful for asynchronous and deterministic code.

Mockito is a Java library that helps developers mock objects in their unit tests. This library makes unit testing more manageable and flexible by providing mock objects that replace natural objects in the code. Mockito can also be used in conjunction with other testing frameworks. It was created by a team of developers and released in August 2019.