tests: Add 'domain' mark for apps that add/remove domains

Test:
- "py.test-3 --include-functional -m domain" tests the marked apps.

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/avahi/tests/test_functional.py

@@ -7,7 +7,10 @@ import pytest
 
 from plinth.tests.functional import BaseAppTests
 
-pytestmark = [pytest.mark.system, pytest.mark.essential, pytest.mark.avahi]
+pytestmark = [
+    pytest.mark.system, pytest.mark.essential, pytest.mark.domain,
+    pytest.mark.avahi
+]
 
 
 class TestAvahiApp(BaseAppTests):

plinth/modules/config/tests/test_functional.py

@@ -6,7 +6,10 @@ Functional, browser based tests for config app.
 import pytest
 from plinth.tests import functional
 
-pytestmark = [pytest.mark.system, pytest.mark.essential, pytest.mark.config]
+pytestmark = [
+    pytest.mark.system, pytest.mark.essential, pytest.mark.domain,
+    pytest.mark.config
+]
 
 
 @pytest.fixture(scope='module', autouse=True)

plinth/modules/dynamicdns/tests/test_functional.py

@@ -10,7 +10,8 @@ import pytest
 from plinth.tests import functional
 
 pytestmark = [
-    pytest.mark.system, pytest.mark.essential, pytest.mark.dynamicdns
+    pytest.mark.system, pytest.mark.essential, pytest.mark.domain,
+    pytest.mark.dynamicdns
 ]
 
 

plinth/modules/pagekite/tests/test_functional.py

@@ -6,7 +6,7 @@ Functional, browser based tests for pagekite app.
 import pytest
 from plinth.tests import functional
 
-pytestmark = [pytest.mark.system, pytest.mark.pagekite]
+pytestmark = [pytest.mark.system, pytest.mark.domain, pytest.mark.pagekite]
 
 # TODO Scenario: Enable standard services
 # TODO Scenario: Disable standard services

plinth/modules/tor/tests/test_functional.py

@@ -14,7 +14,7 @@ _TOR_FEATURE_TO_ELEMENT = {
     'software': 'tor-apt_transport_tor_enabled'
 }
 
-pytestmark = [pytest.mark.apps, pytest.mark.tor]
+pytestmark = [pytest.mark.apps, pytest.mark.domain, pytest.mark.tor]
 
 
 class TestTorApp(functional.BaseAppTests):