KPJ Testing

KpjTestingApplicationTests

Integration test

1. Create Spring Boot Test (Integration test with the application context loading)
2. Provide mock instance of HelloWorldService
   1. HelloWorldService#helloWorld() return "Hello World"
   2. HelloWorldService#echo(String) returns "KPJ echo" for all inputs
3. Add asserts and JUnit annotations
   1. Verify the HelloWorldService#helloWorld() was called
   2. Assert the KpjTesting#printEcho(String) returns "KPJ echo"

KpjTestingTest

Unit test

1. Create Spy on the KpjTesting#helloWorldService field
2. Add JUnit annotations
3. Verify the HelloWorldServiceImpl#helloWorld() is called
4. Change behavior of HelloWorldServiceImpl#echo(String) to always returns "KPJ Rulez"