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

import assert from 'assert';
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import * as actions from '../../../ui/app/store/actions';
import * as actionConstants from '../../../ui/app/store/actionConstants';

const middlewares = [thunk];
const mockStore = configureMockStore(middlewares);

describe('tx confirmation screen', function () {
  const txId = 1457634084250832;
  const initialState = {
    appState: {},
    metamask: {
      unapprovedTxs: {
        [txId]: {
          id: txId,
          status: 'unconfirmed',
          time: 1457634084250,
        },
      },
    },
  };

  const store = mockStore(initialState);

  describe('cancelTx', function () {
    it('creates COMPLETED_TX with the cancelled transaction ID', async function () {
      actions._setBackgroundConnection({
        approveTransaction(_, cb) {
          cb(new Error('An error!'));
        },
        cancelTransaction(_, cb) {
          cb();
        },
        getState(cb) {
          cb(null, {});
        },
      });

      await store.dispatch(actions.cancelTx({ id: txId }));
      const storeActions = store.getActions();
      const completedTxAction = storeActions.find(
        ({ type }) => type === actionConstants.COMPLETED_TX,
      );
      const { id } = completedTxAction.value;
      assert.equal(id, txId);
    });
  });
});