================
What is Junit ?
=================

=> Free & open source java based framework

=> It is used for unit testing

Note: It is used only for java projects unit testing

========================
What is Unit Testing ?
========================

=> Testing individual components of the application is called as Unit testing.

class UserService {
	
	m1() {
	}

	m2(){
	}

	m3(){
	}
}

=> Unit testing is used to identify weather code is working as expected or not.

=> Unit testing is used to identify bugs in the code.

=> With the help of unit testing we can identify bugs at early stage. 

=> By performing unit testing we can provide quality code  to higher environments
   (dev, qa, uat and prod)


## Note: Developer is responsible to perform unit testing in the project ##


=================================
What is isolated unit testing ?
=================================

=> Controller methods are depends on service methods and service methods depends on dao/repo methods.

=> When we are performing unit testing for controller method that time only controller method should be executed (service method shouldn't be called).


Ex:

m1() {
	
	//logic

	m2 ( )

	// logic

}

m2(){
	//logic
}

Note: When we are unit testing m1() method only m1() logic should be executed without calling real m2() method.

=> To perform isolated unit testing we will use Mocking.


===================
What is Mocking ?
===================

=> The process of creating substitute object for real-object is called as Mocking.

		1) Mockito
		2) Easy Mock
		c) Power Mock
		d) JMock

========================
What is code coverage ?	
========================

=> The process of identifying which lines of code is unit tested and which lines of code is missed in unit testing.

=> Industry standard is minimum 80% code coverage for the project.

=> To get code coverage report we can use 'jacocco' plugin.


m2(boolean value){
	
	// logic

	if(c1){
		//l0 lines
	}else if(c2){
		// 15 lines
	}else if(c3){
		// 20 lines
	}else{
		// 10 lines
	}
}

------------------------------------------------------------------

testM2_c1(a) ----> with c1 input

testM2_c2(a) ----> with c2 input

testM2_c3(a) ----> with c3 input

testM2_c4(a) ----> with input whic don't satisfy any condition


===============================================
SpringBoot Rest API + Junit + Mocking + Jacoco
===============================================

## Git repo : https://github.com/ashokitschool/sb_rest_api_junit_app.git

@Test : To represent our method as unit test method (test case) 

Note: @Test is used at method level.

@MockBean : It is used to create mock object for real bean

@InjectMocks : It is used to inject mock beans in our target

@SpringBootTest : It is used to represent our class as SpringBoot test class.

@WebMvcTest : To represent unit testing for RestController class


========================================
Jacoco plugin configuration in pom.xml
========================================

=> Add below plugin and execute 'mvn test goal.

Note: Code Coverage report we can find in "target/site/jacoco/index.html"

=> When our classes doesn't have business logic then we don't perform unit testing and we will exclude such classes from code coverage report.

EX: Start class, pojo classes, entities and form bindings, Config, Constants .......

--------------------------------------------------------------------------------------------
<plugin>
	<groupId>org.jacoco</groupId>
	<artifactId>jacoco-maven-plugin</artifactId>
	<version>0.8.11</version>
	<configuration>
		<excludes>
			<exclude>in/ashokit/model/**</exclude>
			<exclude>in/ashokit/Application**</exclude>
		</excludes>
	</configuration>
	<executions>
		<execution>
			<goals>
				<goal>prepare-agent</goal>
			</goals>
		</execution>
		<execution>
			<id>report</id>
			<phase>test</phase>
			<goals>
				<goal>report</goal>
			</goals>
		</execution>
	</executions>
</plugin>
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