Xtykutl

I getting following error when I tried to change the value in control.

Uncaught (in promise) Error: A state mutation was detected between
dispatches, in the path test. This may cause incorrect behavior.

Below is the code

Reducer

export default function testReducer(state = {}, action) {

  switch (action.type) {

    case types.UPDATE_TEST_SUCCESS:

      return {

        ...state,

        test: action.test

      };

    default:

      return state;

  }

}

Action

export function saveTest(testData) {

  return function(dispatch) {

    return testApi.testExam(testData).then(savedData => {

      dispatch(updateTestSuccess(savedData));

    });

  };

}



export function updateTestSuccess(exam) {

  return { type: types.UPDATE_Test_SUCCESS, exam };

}

API

static saveTest(testData) {

  let url = services.GET_Test_URL;

   return fetch(url, {

    method: 'PUT',

    body: JSON.stringify(testData).toString(), 

    dataType : "json",

    headers: {

          'Accept': 'application/json',

          'Content-Type': 'application/json'

      }

  }).then((response) =>  response.json())

   .then((testD) => Object.assign({}, testD))

  .catch((error) => { throw (error); });

}