The integration test for the preceding method is very simple. Take a look at the following test method:

   @Test
   fun `GET welcome-with-parameter returns "Hello World"`() {
     // When
     val body = restTemplate.getForObject(
     "/welcome-with-parameter/name/Buddy", 
     WelcomeBean::class.java)
     // Then
    assertThat(body.message, 
    containsString("Hello World, Buddy"));
   }

A few important things to note are as follows:

• restTemplate.getForObject("/welcome-with-parameter/name/Buddy", WelcomeBean::class.java): This matches against the variable template in the URI. We are passing in the name, Buddy.
• assertThat(response.getBody(), containsString("Hello World, Buddy")): We expect the response to contain the message with the name.

In this section, we looked at the basics of creating a simple REST service with Spring Boot. We also ensured that we have good unit tests and integration tests.