The complete Test method is listed as follows:

    @Test 
    public void basicTest_WithAllValidationErrors() throws Exception { 
      this.mockMvc 
        .perform( 
           post("/create-user-with-validation") 
           .accept(MediaType.parseMediaType( 
           "application/html;charset=UTF-8"))) 
           .andExpect(status().isOk()) 
           .andExpect(model().errorCount(4)) 
           .andExpect(model().attributeHasFieldErrorCode 
           ("user", "name", "Size")); 
    }

Some points to note here are as follows:

• post("/create-user-with-validation"): Creates an HTTP POST request to the specified URI. Since we are not passing any request parameters, all attributes are null. This will trigger validation errors.
• model().errorCount(4): Checks whether there are four validation errors on the model.
• model().attributeHasFieldErrorCode("user", "name", "Size"): Checks whether the user attribute has a field name with the validation error named Size.