metamask-extension/test/unit/actions/config_test.js

import assert from 'assert';
import freeze from 'deep-freeze-strict';
import reducers from '../../../ui/app/ducks';
import * as actionConstants from '../../../ui/app/store/actionConstants';
import { NETWORK_TYPE_RPC } from '../../../shared/constants/network';

describe('config view actions', function () {
  const initialState = {
    metamask: {
      rpcUrl: 'foo',
      frequentRpcList: [],
    },
    appState: {
      currentView: {
        name: 'accounts',
      },
    },
  };
  freeze(initialState);

  describe('SET_RPC_TARGET', function () {
    it('sets the state.metamask.rpcUrl property of the state to the action.value', function () {
      const action = {
        type: actionConstants.SET_RPC_TARGET,
        value: 'foo',
      };

      const result = reducers(initialState, action);
      assert.equal(result.metamask.provider.type, NETWORK_TYPE_RPC);
      assert.equal(result.metamask.provider.rpcUrl, 'foo');
    });
  });
});