Testing rest controller

Signed-off-by: Kemal Žigović <kvant800@gmail.com>

Author: Kvark900

src/test/java/com/kvark900/TestControllers.java

@@ -42,7 +42,7 @@ public void testController() throws Exception{
 
  List<Author> allAuthors = Collections.singletonList(author);
 
- given(authorService.findAll()).willReturn();
+ given(authorService.findAll()).willReturn(allAuthors);
 
  mockMvc.perform(get("/authors")
  .contentType(MediaType.APPLICATION_JSON))