Mastering Spring 5.0

Unit testing

The code to unit test retrieveTodo is as follows:

     @Test     public void retrieveTodo() throws Exception {       Todo mockTodo = new Todo(1, "Jack", "Learn Spring MVC",        new Date(), false);        when(service.retrieveTodo(anyInt())).thenReturn(mockTodo);       MvcResult result = mvc.perform(       MockMvcRequestBuilders.get("/users/Jack/todos/1")       .accept(MediaType.APPLICATION_JSON))       .andExpect(status().isOk()).andReturn();       String expected = "{id:1,user:Jack,desc:\"Learn Spring       MVC\",done:false}";       JSONAssert.assertEquals(expected,        result.getResponse().getContentAsString(), false);     }

A few important things to note are as follows:

• when(service.retrieveTodo(anyInt())).thenReturn(mockTodo): We are mocking the retrieveTodo service method to return the mock ...