add "sudo mode": confirm password before doing sysadmin work

tests/ui/fixtures.py

@@ -0,0 +1,53 @@
+from contextlib import contextmanager
+from pytest import yield_fixture # pylint: disable=E1101
+from tests.ui.driver import Browser
+from tests.common.common import (
+    BASE_URL, USERNAME, PASSWORD, ADMIN_USERNAME, ADMIN_PASSWORD
+)
+
+@yield_fixture(scope='session')
+def browser():
+    """Get an instance of a browser that already logged in.
+
+    Note this browser instance are shared among all test cases.
+    """
+    with _create_browser(admin=False) as browser:
+        yield browser
+
+@yield_fixture(scope='session')
+def admin_browser():
+    """Get an instance of a browser that already logged in with admin credentials.
+
+    This browser instance are shared among all test cases.
+    """
+    with _create_browser(admin=True) as browser:
+        yield browser
+
+@yield_fixture(scope='function')
+def admin_browser_once():
+    """Get an instance of a browser that already logged in with admin credentials.
+
+    This browser instance are created/destroyed for each test case.
+    """
+    with _create_browser(admin=True) as browser:
+        yield browser
+
+@contextmanager
+def _create_browser(admin=False):
+    username, password = (ADMIN_USERNAME, ADMIN_PASSWORD) \
+                         if admin else (USERNAME, PASSWORD)
+    b = Browser(BASE_URL)
+    b.gohome()
+    assert b.path == '/accounts/login/'
+
+    b.fill_form({
+        'username': username,
+        'password': password
+    })
+    b.submit_by_input_name('username')
+    assert b.path != '/accounts/login/'
+
+    try:
+        yield b
+    finally:
+        b.quit()