How to check String in response body with mockMvc

Question

I have simple integration test

@Test
public void shouldReturnErrorMessageToAdminWhenCreatingUserWithUsedUserName()          


        

Answer 1

here a more elegant way

mockMvc.perform(post("/retrieve?page=1&countReg=999999")
            .header("Authorization", "Bearer " + validToken))
            .andExpect(status().isOk())
            .andExpect(content().string(containsString("regCount")));