added login tests (headless and with selenium)

tests/test_webinterface.py

@@ -0,0 +1,39 @@
+from bs4 import BeautifulSoup
+
+def test_login(browser, live_server):
+    response = browser.get(f'http://localhost:{live_server.port}')
+
+    assert '<h1>Space Zugangsverwaltung</h1>' in browser.page_source
+
+    response = browser.get(f'http://localhost:{live_server.port}/login')
+
+    email_form = browser.find_element_by_id('email').send_keys('gandalf@shire.me')
+    password_form = browser.find_element_by_id('password').send_keys('shadowfax')
+    submit_button = browser.find_element_by_id('submit').click()
+
+    assert 'Tür öffnen' in browser.page_source
+
+
+def login(client, payload):
+    return client.post('/login', data=payload, follow_redirects=True)
+
+def test_login_headless(client):
+    # extract csrf token from the login page source
+    response = client.get('/login')
+    soup = BeautifulSoup(response.data)
+    csrf_token = soup.find('input', attrs={'id': 'csrf_token'})['value']
+
+    # send login information
+    payload = {
+         'csrf_token': csrf_token,
+         'email': 'gandalf@shire.me',
+         'password': 'shadowfax'
+    }
+    response = login(client, payload)
+    soup = BeautifulSoup(response.data)
+
+    # make sure login succeeded -> Tür öffnen button will appear
+    assert any(['Tür öffnen' in link.contents[0] for link in soup.findAll('a', attrs={'class': ['btn'], 'role': 'button'})])
+
+def logout(client):
+    return client.get('/logout', follow_redirects=True)