Added test for 404 error page.

Testing 3 different un-existing routes.

Author: penelopez

tests/common/404_page/__init__.py

@@ -0,0 +1,25 @@
+from codebender_testing.utils import SeleniumTestCase
+from selenium.webdriver.common.by import By
+
+# Global variables
+ERROR_MESSAGE = 'Oops! Something seems to be broken :/'
+ROUTES_404 = [
+    '/hello',
+    '/foo',
+    '/bar'
+]
+
+class Test404Page(SeleniumTestCase):
+    def test_404_page(self, testing_url):
+        """
+        Test for 404 error page.
+        Visits URLs registered at ROUTES_404 and verifies that the 404 error page opens
+        """
+
+        for url in ROUTES_404:
+            self.open(url)
+            logo = self.get_element(By.CSS_SELECTOR, '.brand')
+            assert logo.get_attribute('href')[:-1] == self.site_url # check href attribute of .brand
+
+            error_message = self.get_element(By.CSS_SELECTOR, '.container-fluid .span12 .span12 h1')
+            assert error_message.text.strip() ==  ERROR_MESSAGE # check text value of error message h1