metamask-extension/ui/pages/send/send-content/send-amount-row/amount-max-button/amount-max-button.test.js

import React from 'react';
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';

import { fireEvent } from '@testing-library/react';
import { initialState, SEND_STATUSES } from '../../../../../ducks/send';
import { renderWithProvider } from '../../../../../../test/jest';
import AmountMaxButton from './amount-max-button';

const middleware = [thunk];

describe('AmountMaxButton Component', () => {
  describe('render', () => {
    it('should render a "Max" button', () => {
      const { getByText } = renderWithProvider(
        <AmountMaxButton />,
        configureMockStore(middleware)({
          send: initialState,
          gas: { basicEstimateStatus: 'LOADING' },
        }),
      );
      expect(getByText('Max')).toBeTruthy();
    });

    it('should dispatch action to set mode to MAX', () => {
      const store = configureMockStore(middleware)({
        send: { ...initialState, status: SEND_STATUSES.VALID },
        gas: { basicEstimateStatus: 'READY' },
      });
      const { getByText } = renderWithProvider(<AmountMaxButton />, store);

      const expectedActions = [
        { type: 'send/updateAmountMode', payload: 'MAX' },
      ];

      fireEvent.click(getByText('Max'), { bubbles: true });
      const actions = store.getActions();
      expect(actions).toStrictEqual(expectedActions);
    });

    it('should dispatch action to set amount mode to INPUT', () => {
      const store = configureMockStore(middleware)({
        send: {
          ...initialState,
          status: SEND_STATUSES.VALID,
          amount: { ...initialState.amount, mode: 'MAX' },
        },
        gas: { basicEstimateStatus: 'READY' },
      });
      const { getByText } = renderWithProvider(<AmountMaxButton />, store);

      const expectedActions = [
        { type: 'send/updateAmountMode', payload: 'INPUT' },
      ];

      fireEvent.click(getByText('Max'), { bubbles: true });
      const actions = store.getActions();
      expect(actions).toStrictEqual(expectedActions);
    });
  });
});