python-selenium-js-tests.py

"""
!!! Run tests by just typing 'python <this file>', not throw nosetests/your IDE

Before run these tests:
  1) make sure that PhantomJS executable is in your PATH (type phantomjs in CLI)
     for custom phantomjs location change PHANTOMJS_PATH
  2) run app dev server and make sure that BASE_URL is equal to real URL
"""

import unittest

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException

PHANTOMJS_PATH = 'phantomjs'
BASE_URL = 'http://localhost:8080'

class BaseJsTest(unittest.TestCase):
    url = ''

    def setUp(self, *args, **kwargs):
        super(BaseJsTest, self).setUp(*args, **kwargs)
        self.driver = webdriver.PhantomJS(PHANTOMJS_PATH)

    def test_no_errors(self, authorized = True):
        if self.__class__.__name__ != 'BaseJsTest':
            self.driver.delete_all_cookies()

            timeout = 2
            self.driver.implicitly_wait(timeout)
            self.driver.get(BASE_URL + self.url)

            # force to wait 'timeout' seconds or until error indicator appear
            try:
                self.driver.find_element_by_id('error-indicator')
            except NoSuchElementException:
                pass

            logs = self.driver.get_log('browser')
            errors = [log['message'] for log in logs if log['level'] != 'INFO']
            errors = ';\n'.join(errors)
            self.assertEqual(errors, '')

    def tearDown(self):
        self.driver.close()

class UiHomeJsTest(BaseJsTest):
    url = '/'


class UiSignInJsTest(BaseJsTest):
    url = '/sign-in'


class UiSignUpJsTest(BaseJsTest):
    url = '/sign-up'

if __name__ == '__main__':
    unittest.main()

""" 
in JS:

var _consoleError = console.error;
console.error = function (message) {
    var errorIndicator = document.createElement('div');
    errorIndicator.id = 'error-indicator';
    document.body.appendChild(errorIndicator);
    _consoleError.apply(console, arguments);
};

window.onerror = function (errorMsg, url, lineNumber) {
    console.error(errorMsg + ' - '+url+':'+lineNumber)
    return false;
}
"""