onlyfullstack/unit-testing-and-integration-testing-with-spring-boot

This repository contains the ways to do the unit testing and mocking in Spring

Unit Testing and Mockito Tutorial

In this tutorial, we will understand how to write JUnit test cases. We will understand and implement the below topics.

JUnit Tutorial

Part 1 - What is Unit Testing? In this tutorial, we will understand below topics -

• What is Unit Testing?
• Unit Testing Method
• When is it performed?
• Who performs it?
• How to perform it?

https://onlyfullstack.blogspot.com/2019/02/what-is-unit-testing.html

Part 2 - ** What is JUnit? How to use JUnit? In this tutorial, we will understand below topics -

• What is Junit?
• How to use Junit?
• Where should the test be located?
• How to execute JUnit tests?
  1. Using mvn command
  2. Using Eclipse Run as > JUnit Test
• Eclipse Optimize Imports to Include Static Imports

https://onlyfullstack.blogspot.com/2019/02/what-is-junit-how-to-use-junit.html

Part 3 - Annotations used in JUnit In this tutorial, we will understand below topics -

• How to define a test in JUnit?
• Annotations used in Junit
  1. @Test
  2. @Before
  3. @After
  4. @BeforeClass
  5. @AfterClass
  6. @Ignore or @Ignore("Why disabled")
  7. @Test (expected = Exception.class)

https://onlyfullstack.blogspot.com/2019/02/annotations-used-in-junit.html

Part 4 - JUnit Assert Methods In this tutorial, we will understand below topics -

• Assert Methods
  1. assertEquals()
  2. assertTrue() + assertFalse()
  3. assertNull() + assertNotNull()
  4. assertSame() and assertNotSame()
  5. assertThat()

https://onlyfullstack.blogspot.com/2019/02/junit-assert-methods.html

Part 5 - Complete guide for Hamcrest JUnit In this tutorial we will understand below topics-

• Hamcrest Matcher Tutorial
• The Core Matchers
  1. CoreMatchers.is(T value)
  2. CoreMatchers.not(T value)
  3. CoreMatchers.startsWith(String prefix) & CoreMatchers. endsWith(String suffix)
  4. CoreMatchers.containsString(String substring)
  5. CoreMatchers.notNullValue()
  6. CoreMatchers.sameInstance(T target) & CoreMatchers.instanceOf(Class<?> type)
• Number Matcher
  1. Matchers.greaterThan(T value) Matchers.greaterThanOrEqualTo(T value)
  2. Matchers.lessThan(T value) Matchers.lessThanOrEqualTo(T value)
• Collection Matcher
  1. Matchers.empty()
  2. Matchers.hasSize(int size) and Matchers.hasItem(T item)
  3. Matchers. hasKey(K key), Matchers.hasValue(V value) & Matchers.hasEntry(K key, V value)

https://onlyfullstack.blogspot.com/2019/02/complete-guide-for-hamcrest-junit.html

Part 6 - Assert for an exception in JUnit In this tutorial, we will understand below topics-

• How do you assert that a certain exception is thrown in JUnit 4 tests?
  1. try-catch idiom
  2. @Test expected annotation
  3. Junit @Rule

https://onlyfullstack.blogspot.com/2019/02/assert-for-exception-in-junit.html

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Mockito Tutorial

Mickito Tutorial

In this tutorial, we will understand how to use Mockito framework. We will understand and implement the below topics.

Part 1 - What is Mockito? In this tutorial, we will understand below topics -

• What is a Mock Object?
• When should I mock?
• Mockito Framework
• Enable Mockito Annotations
• How to Mock Object with @Mock & @InjectMock annotations in Spring application?

https://onlyfullstack.blogspot.com/2019/02/what-is-mockito.html

Part 2 - How to mock methods with Mockito?

• How to mock methods?
  1. when/then
  2. when/thenThrow
  3. when/thenAnswer

https://onlyfullstack.blogspot.com/2019/02/how-to-mock-methods-with-mockito.html

Part 3- How to mock void methods with Mockito

• Mocking Void Methods
• Three ways to mock the void method:
  1. doNothing/when
  2. doAnswer/when
  3. doThrow/when

https://onlyfullstack.blogspot.com/2019/02/how-to-mock-void-methods-with-mockito.html

Part 4 - How to verify mocks in Mockito

• Simple verify method
• Variations in verify method
• Verify with the number of times
• Mockito Verify Order of Invocation

https://onlyfullstack.blogspot.com/2019/02/how-to-verify-mocks-in-mockito.html

Part 5 - **** Mockito Mock vs Spy

• Mockito Mock vs Spy
  1. Object declaration
  2. When the methods are not mocked
  3. When the method is mocked

https://onlyfullstack.blogspot.com/2019/02/mockito-mock-vs-spy.html