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Mockito Tutorial For Beginners

Gain expertise on the most popular java mocking framework

Installing Tools

Course Overview

Step List

JUnit

  • Step 01 : Need for Unit Testing
  • Step 02 : Setting up your First JUnit
  • Step 03 : First Successful JUnit. Green Bar and assertEquals
  • Step 04 : Refactoring Your First JUnit Test
  • Step 05 : Second JUnit Example assertTrue and assertFalse
  • Step 06 : @Before @After
  • Step 07 : @BeforeClass @AfterClass
  • Step 08 : Comparing Arrays in JUnit Tests
  • Step 09 : Testing Exceptions in JUnit Tests
  • Step 10 : Testing Performance in JUnit Tests
  • Step 11 : Parameterized Tests
  • Step 12 : Organize JUnits into Suites

Mockito

  • Step 01 : Set up an Eclipse Project with JUnit and Mockito frameworks. First Green Bar.
  • Step 02 : Example to start understanding why we need mocks.
  • Step 03 : What is a stub? Create an unit test using Stub? Disadvantages of Stubs.
  • Step 04 : Your first Mockito code! Hurrah!!! Lets use Mockito to mock TodoService.
  • Step 05 : Stubbing variations with Mockito. A few mockito examples mocking List class : Multiple return values, Argument Matchers and throwing exceptions.
  • Some Theory : Mockito vs EasyMock https://github.com/mockito/mockito/wiki/Mockito-vs-EasyMock
  • Step 06 : Introduction to BDD. Given When Then. BDD Mockito Syntax.
  • Step 07 : How to verify calls on a mock? Verify how many times a method is called. We will add deleteTodo method to the TodoService.
  • Step 08 : How to capture an argument which is passed to a mock?
  • Step 09 : Hamcrest Matchers.
  • Step 10 : Let's simplify things with Mockito Annotations. @Mock, @InjectMocks, @RunWith(MockitoJUnitRunner.class), @Captor
  • Step 11 : JUnit Rules. Using MockitoJUnit.rule() instead of @RunWith(MockitoJUnitRunner.class).
  • Step 12 : Real world Example with Spring
  • Step 13 : What is a spy? How to spy with Mockito?
  • Step 14 : Some Theory : Why does Mockito not allow stubbing final and private methods?
  • Step 15 : Using PowerMock and Mockito to mock a Static Method.
  • Step 16 : Using PowerMock and Mockito to invoke a private Method.
  • Step 17 : Using PowerMock and Mockito to mock a constructor.
  • Step 18 : Good Unit Tests.

Expectations

  • You should know Java.
  • You are NOT expected to have any experience with Eclipse or Maven.
  • We will help you install Eclipse and get up and running with Maven.

Running Examples

  • Download the zip or clone the Git repository.
  • Unzip the zip file (if you downloaded one)
  • Open Command Prompt and Change directory (cd) to folder containing pom.xml
  • Open Eclipse
    • File -> Import -> Existing Maven Project -> Navigate to the folder where you unzipped the zip
    • Select the right project
  • Choose the Spring Boot Application file (search for @SpringBootApplication)
  • Right Click on the file and Run as Java Application
  • You are all Set

Troubleshooting

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