chore(tests): add voyager reactive tests

Author: oliemansm

graphql-spring-boot-autoconfigure/src/main/java/graphql/kickstart/autoconfigure/editor/voyager/ReactiveVoyagerAutoConfiguration.java

@@ -18,8 +18,8 @@
 public class ReactiveVoyagerAutoConfiguration {
 
   @Bean
-  ReactiveVoyagerController voyagerController() {
-    return new ReactiveVoyagerController();
+  ReactiveVoyagerController voyagerController(VoyagerIndexHtmlTemplate voyagerIndexHtmlTemplate) {
+    return new ReactiveVoyagerController(voyagerIndexHtmlTemplate);
   }
 
   @Bean

graphql-spring-boot-autoconfigure/src/main/java/graphql/kickstart/autoconfigure/editor/voyager/ReactiveVoyagerController.java

@@ -3,7 +3,6 @@
 import java.io.IOException;
 import java.util.Map;
 import lombok.RequiredArgsConstructor;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.web.server.csrf.CsrfToken;
@@ -18,7 +17,7 @@
 @RequiredArgsConstructor
 public class ReactiveVoyagerController {
 
-  @Autowired private VoyagerIndexHtmlTemplate indexTemplate;
+  private final VoyagerIndexHtmlTemplate indexTemplate;
 
   @GetMapping(path = "${graphql.voyager.mapping:/voyager}")
   public Mono<ResponseEntity<String>> voyager(