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