// validate the error response.
				want := getAPIError(test.expectedAPIError)
				if test.expectedAPIError == -1 {
					want.HTTPStatusCode = 200
					want.Code = "<no error>"
					want.Description = "<no error>"
				}
				if rec.Code != http.StatusOK {
					var errBytes []byte
					// read the response body.
					errBytes, err = io.ReadAll(rec.Result().Body)
					if err != nil {