Home.js

/* Core */
import React, { Component } from 'react';
import PropTypes from 'prop-types';

/* Redux */
import { connect } from 'react-redux';
import UserActions from 'store/ducks/user';

/* Presentational */
import { View, TextInput } from 'react-native';
import Alert from 'components/Alert';
import Button from 'components/Button';
import Input from 'components/Input';

import styles from './styles';

class Home extends Component {
  static propTypes = {
    getInformation: PropTypes.func.isRequired,
  };

  state = {
    cellphone: '',
  };

  validation = () => {
    const { cellphone } = this.state;
    if (cellphone) {
      const { input } = this.input;
      this.props.getInformation(input.getRawValue());
    } else {
      Alert.alert('Você precisa passar um número válido.');
    }
  }

  render() {
    return (
      <View style={styles.container}>
        <Input
          onChangeText={(cellphone) => { this.setState({ cellphone }); }}
          value={this.state.cellphone}
          type="cel-phone"
          icon="phone"
          placeholder="Seu número de telefone"
          ref={(ref) => { this.input = ref; }}
        />
        <Button title="Entrar" onPress={this.validation} />
      </View>
    );
  }
}

const mapDispatchToProps = dispatch => ({
  getInformation: cellphone => dispatch(UserActions.userGetInformation(cellphone)),
});

export default connect(null, mapDispatchToProps)(Home);

Home.test.js

/* Core */
import React from 'react';

/* Test */
import { shallow } from 'enzyme';
import sinon from 'sinon';

/**
 * Presentational
 */
import Button from 'components/Button';

import Home from 'pages/Home';
import Alert from 'components/Alert';

/* redux */
import configureStore from 'redux-mock-store';
import ActionCreators from 'store/ducks/user';

const mockStore = configureStore([]);

const initialStore = {
  user: {},
};

describe('Testing Home Page', () => {
  const store = mockStore(initialStore);
  let wrapper;

  function createWrapper() {
    return shallow(
      <Home />,
      { context: { store } },
    );
  }

  beforeEach(() => {
    wrapper = createWrapper().dive();
    store.clearActions();
  });

  it('Can get user information when is valid cell phone', () => {
    wrapper.setState({ cellphone: '9999999999' });
    wrapper.find(Button).simulate('press');
    expect(store.getActions()).toContainEqual(ActionCreators.userGetInformation('9999999999'));
  });

  it('Can\'t get user information when is invalid cell phone', () => {
    sinon.spy(Alert, 'alert');
    wrapper.find(Button).simulate('press');
    expect(store.getActions()).not.toContainEqual(ActionCreators.userGetInformation(''));
    expect(Alert.alert.calledOnce).toBe(true);
  });
});