Mockito Tutorial For Beginners

Gain expertise on the most popular java mocking framework

• Installing Eclipse, Maven and Java
• Running Examples
• Course Overview
  • Course Steps
  • Expectations
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Installing Tools

• PDF : https://github.com/in28minutes/SpringIn28Minutes/blob/master/InstallationGuide-JavaEclipseAndMaven_v2.pdf
• Video : https://www.youtube.com/watch?v=eqRF4xHoGck

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

• Refer our TroubleShooting Guide - https://github.com/in28minutes/in28minutes-initiatives/tree/master/The-in28Minutes-TroubleshootingGuide-And-FAQ

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