Feat/vist/cpc 1119/display visits (#630)

https://champlainsaintlambert.atlassian.net/browse/CPC-1119
## Context:
View All The Visits using getAllVisits
## Changes
Added a controller in the API Gateway under the V2 folder with a
getAllVisits with a new V2 endpoint.
Added some ControllerUniTests to test getAllVisits.
Created a folder in react that hold the visit page.

## Dev notes (Optional)
- Still missing other tests, still need to display all the visits and
add the route to the visit page

api-gateway/src/main/java/com/petclinic/bffapigateway/presentationlayer/v2/VisitController.java

@@ -0,0 +1,39 @@
+package com.petclinic.bffapigateway.presentationlayer.v2;
+
+import com.petclinic.bffapigateway.domainclientlayer.VisitsServiceClient;
+import com.petclinic.bffapigateway.dtos.Auth.Role;
+import com.petclinic.bffapigateway.dtos.Visits.VisitResponseDTO;
+import com.petclinic.bffapigateway.utils.Security.Annotations.SecuredEndpoint;
+import com.petclinic.bffapigateway.utils.Security.Variables.Roles;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import reactor.core.publisher.Flux;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("api/v2/gateway/visits")
+@Validated
+@Slf4j
+@CrossOrigin(origins = "http://localhost:3000, http://localhost:80")
+public class VisitController {
+
+    private final VisitsServiceClient visitsServiceClient;
+
+    @SecuredEndpoint(allowedRoles = {Roles.ADMIN})
+    @GetMapping(value = "", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
+    public ResponseEntity<Flux<VisitResponseDTO>> getAllVisits() {
+        return ResponseEntity.ok().body(visitsServiceClient.getAllVisits());
+    }
+
+
+    //add more endpoints here
+
+
+}

api-gateway/src/test/java/com/petclinic/bffapigateway/presentationlayer/v2/visit/VisitControllerUnitTest.java

@@ -0,0 +1,91 @@
+package com.petclinic.bffapigateway.presentationlayer.v2.visit;
+
+import com.petclinic.bffapigateway.domainclientlayer.VisitsServiceClient;
+import com.petclinic.bffapigateway.dtos.Visits.Status;
+import com.petclinic.bffapigateway.dtos.Visits.VisitResponseDTO;
+import com.petclinic.bffapigateway.presentationlayer.v2.VisitController;
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Flux;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.util.Date;
+
+import static org.mockito.Mockito.*;
+
+@WebFluxTest(controllers = VisitController.class)
+@AutoConfigureWebTestClient
+@ContextConfiguration(classes = {
+        VisitController.class,
+        VisitsServiceClient.class
+})
+public class VisitControllerUnitTest {
+    @Autowired
+    private WebTestClient webTestClient;
+
+    @MockBean
+    private VisitsServiceClient visitsServiceClient;
+
+    private final String BASE_VISIT_URL = "/api/v2/gateway/visits";
+
+    //VisitResponseDTO Objects for testing purposes
+    private final VisitResponseDTO visitResponseDTO1 = VisitResponseDTO.builder()
+            .visitId("V001")
+            .visitDate(LocalDate.of(2021, 5, 1).atStartOfDay())
+            .description("Routine check-up")
+            .petId("P001")
+            .petName("Buddy")
+            .petBirthDate(Date.from(LocalDate.of(2020, 5, 1).atStartOfDay(ZoneId.systemDefault()).toInstant()))
+            .practitionerId("PR001")
+            .vetFirstName("John")
+            .vetLastName("Doe")
+            .vetEmail("[email protected]")
+            .vetPhoneNumber("555-1234")
+            .status(Status.COMPLETED)
+            .build();
+    @Test
+    void getAllVisits_whenAllPropertiesExist_thenReturnFluxResponseDTO() {
+        // Arrange
+        when(visitsServiceClient.getAllVisits())
+                .thenReturn(Flux.just(visitResponseDTO1));
+
+        // Act
+        webTestClient.get()
+                .uri(BASE_VISIT_URL)
+                .accept(MediaType.TEXT_EVENT_STREAM)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBodyList( VisitResponseDTO.class)
+                .hasSize(1);
+        // Assert
+        verify(visitsServiceClient, times(1)).getAllVisits();
+    }
+
+    @Test
+    void getAllVisits_whenNoVisitsExist_thenReturnEmptyFlux(){
+        // Arrange
+        when(visitsServiceClient.getAllVisits())
+                .thenReturn(Flux.empty()); // no visits should not throw an error
+        // Act
+        webTestClient.get()
+                .uri(BASE_VISIT_URL)
+                .accept(MediaType.TEXT_EVENT_STREAM)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBodyList(VisitResponseDTO.class)
+                .hasSize(0);
+        // Assert
+        verify(visitsServiceClient, times(1)).getAllVisits();
+    }
+
+}

petclinic-frontend/src/pages/Visit/Visit.tsx

@@ -0,0 +1,10 @@
+import { NavBar } from '@/layouts/AppNavBar';
+
+export default function Visits(): JSX.Element {
+  return (
+    <div>
+      <NavBar />
+      <h1>This is the Visits Page</h1>
+    </div>
+  );
+}