I have a problem...
        
          Part #1 I have Java classes that have methods and I need to
                   test them, so I write JUnit test
                   
               #2 I have an HTTP Endpoint that I need to test 
                   In my test I need to...


        to test a RestController Endpoint (Http)
        
        I need to:
        
        A) make sure the microservice is running
        B) create an Http request (GET/POST/etc)
        C) Send that request 
        D) check the expected JSON results against the actual JSON results
        E) send a bad request and check the expeced Http Status returns
        F) repeat for each Endpoint, and each Http status
        
        
        It turns out Spring Boot has a helper, here is a simple test, 
           this will start the Microservice as part of the test:
        
package com.example.microservice;

import static org.springframework.http.MediaType.APPLICATION_JSON;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.reactive.server.WebTestClient;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureWebTestClient
class ApiApplicationTests {


        @Autowired
        private WebTestClient client;
        
        @Test
        void getRouteByCode() {
                client.get()
                .uri("/route/C1")
                .accept(APPLICATION_JSON)
                .exchange()
                .expectStatus().isOk()
                .expectHeader().contentType(APPLICATION_JSON)
                .expectBody()
                .jsonPath("$.name").isEqualTo("Camino Francés")
                .jsonPath("$.count").isEqualTo(33)
                .jsonPath("$.stages.length()").isEqualTo(34);
        }

}

to get the WebTestClient, I need this dependency

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>


https://jsonpath.com/

https://support.smartbear.com/alertsite/docs/monitors/api/endpoint/jsonpath.html