users: Skip action script tests if LDAP is not set up

- Also, make sure an admin account exists before some tests.

Tests performed:
- The users module test_actions unit tests are skipped if LDAP is not set up.
- The users module unit tests pass if LDAP is set up.

Signed-off-by: Veiko Aasa <veiko17@disroot.org>

plinth/modules/users/tests/test_actions.py

@@ -21,7 +21,19 @@ from plinth.tests import config as test_config
 _cleanup_users = None
 _cleanup_groups = None
 
-pytestmark = pytest.mark.usefixtures('needs_root', 'load_cfg')
+
+def _is_ldap_set_up():
+    """Return whether LDAP is set up."""
+    return subprocess.call([
+        'ldapsearch', '-Y', 'EXTERNAL', '-H', 'ldapi:///', '-b',
+        'ou=groups,dc=thisbox'
+    ]) == 0
+
+
+pytestmark = [
+    pytest.mark.usefixtures('needs_root', 'load_cfg'),
+    pytest.mark.skipif(not _is_ldap_set_up(), reason="LDAP is not configured")
+]
 
 
 def _random_string(length=8):
@@ -150,6 +162,14 @@ def _delete_user(username):
     _call_action(['remove-user', username], input=process_input)
 
 
+def _create_admin_if_does_not_exist():
+    """Create a main admin user"""
+    admin_user, _ = _get_admin_user_password()
+    if not admin_user:
+        username = "pytest_admin"
+        _create_user(username, ['admin'])
+
+
 def _get_admin_user_password():
     """Return an admin username and password."""
 
@@ -161,6 +181,10 @@ def _get_admin_user_password():
     if test_config.admin_username in admin_users:
         return (test_config.admin_username, test_config.admin_password)
 
+    pytest_admin_username = 'pytest_admin'
+    if pytest_admin_username in admin_users:
+        return (pytest_admin_username, pytest_admin_username + '_passwd')
+
     return (admin_users[0], admin_users[0] + '_passwd')
 
 
@@ -200,8 +224,10 @@ def _delete_group(groupname):
 
 def test_create_user():
     """Test whether creating a new user works."""
-    username, password = _create_user(groups=['admin', _random_string()])
-    # assert_can_login_to_console(username, password)
+    _create_admin_if_does_not_exist()
+
+    username, password = _create_user(groups=[_random_string()])
+
     assert _try_login_to_ssh(username, password)
     assert username in _get_samba_users()
     with pytest.raises(subprocess.CalledProcessError):
@@ -210,12 +236,13 @@ def test_create_user():
 
 def test_change_user_password():
     """Test changing user password."""
-    username, old_password = _create_user(groups=['admin'])
+    _create_admin_if_does_not_exist()
+    admin_user, admin_password = _get_admin_user_password()
+
+    username, old_password = _create_user()
     old_password_hash = _get_password_hash(username)
     new_password = 'pass $123'
 
-    admin_user, admin_password = _get_admin_user_password()
-
     process_input = "{0}\n{1}".format(new_password, admin_password).encode()
     _call_action(['set-user-password', username, '--auth-user', admin_user],
                  input=process_input)
@@ -231,6 +258,8 @@ def test_change_user_password():
 
 def test_change_password_as_non_admin_user():
     """Test changing user password as a non-admin user."""
+    _create_admin_if_does_not_exist()
+
     username, old_password = _create_user()
     old_password_hash = _get_password_hash(username)
     new_password = 'pass $123'
@@ -250,6 +279,8 @@ def test_change_password_as_non_admin_user():
 
 def test_change_other_users_password_as_non_admin():
     """Test that changing other user's password as a non-admin user fails."""
+    _create_admin_if_does_not_exist()
+
     username1, password1 = _create_user()
     username2, _ = _create_user()
     new_password = 'pass $123'
@@ -263,17 +294,22 @@ def test_change_other_users_password_as_non_admin():
 
 def test_set_password_for_non_existent_user():
     """Test setting password for a non-existent user."""
+    _create_admin_if_does_not_exist()
+    admin_user, admin_password = _get_admin_user_password()
+
     non_existent_user = _random_string()
-    fake_password = _random_string().encode()
+    fake_password = _random_string()
+
+    process_input = "{0}\n{1}".format(fake_password, admin_password).encode()
     with pytest.raises(subprocess.CalledProcessError):
-        _call_action(['set-user-password', non_existent_user],
-                     input=fake_password)
+        _call_action([
+            'set-user-password', non_existent_user, '--auth-user', admin_user
+        ], input=process_input)
 
 
 def test_rename_user():
     """Test whether renaming a user works."""
-    # create an admin user to create other users with
-    _create_user(groups=['admin'])
+    _create_admin_if_does_not_exist()
 
     old_username, password = _create_user(groups=['admin', _random_string()])
     old_groups = _get_user_groups(old_username)
@@ -304,6 +340,8 @@ def test_rename_user():
 
 def test_delete_user():
     """Test to check whether LDAP users can be deleted"""
+    _create_admin_if_does_not_exist()
+
     username, password = _create_user(groups=[_random_string()])
     _delete_user(username)
     groups_after = _get_user_groups(username)
@@ -352,12 +390,13 @@ def test_delete_admin_group_fails():
 
 def test_user_group_interactions():
     """Test adding/removing user from a groups."""
+    _create_admin_if_does_not_exist()
+    admin_user, admin_password = _get_admin_user_password()
+
     group1 = _random_string()
     user1, _ = _create_user(groups=[group1])
     assert [group1] == _get_user_groups(user1)
 
-    admin_user, admin_password = _get_admin_user_password()
-
     # add-user-to-group is not idempotent
     with pytest.raises(subprocess.CalledProcessError):
         _call_action(