test: verify custom error DTO for void ResponseEntities

Author: JoergSiebahn

sda-commons-web-autoconfigure/src/test/java/org/sdase/commons/spring/boot/web/security/handler/ObscuringErrorHandlerTest.java

@@ -101,6 +101,22 @@ void shouldGetResponseEntityWithBody() {
         .containsExactly(HttpStatus.CREATED, "This will not be altered.");
   }
 
+  @Test
+  void shouldGetErrorResponseFromVoidReturnType() {
+    var headers = new HttpHeaders();
+    headers.setContentType(MediaType.APPLICATION_JSON);
+    ResponseEntity<ApiError> exchange =
+        client.exchange(
+            getServerBaseUrl() + "/api/voidError",
+            HttpMethod.GET,
+            new HttpEntity<>(headers),
+            ApiError.class);
+    assertThat(exchange)
+        .isNotNull()
+        .extracting(ResponseEntity::getStatusCode, r -> r.getBody().getTitle())
+        .containsExactly(HttpStatus.NOT_FOUND, "HTTP Error 404 occurred.");
+  }
+
   @Test
   void shouldGetResource() {
     var headers = new HttpHeaders();

sda-commons-web-autoconfigure/src/test/java/org/sdase/commons/spring/boot/web/security/test/SecurityTestApp.java

@@ -69,6 +69,11 @@ public ResponseEntity<TestResource> header(
     return new ResponseEntity<>(new TestResource(), headers, HttpStatus.OK);
   }
 
+  @GetMapping(value = "/voidError")
+  public ResponseEntity<Void> voidError() {
+    return ResponseEntity.notFound().build();
+  }
+
   @GetMapping(value = "caller", produces = "text/plain")
   public String identifyCaller(@Context HttpServletRequest request) {
     return request.getRemoteAddr();