[wip][poc] untested implementation of marker based sentaku interaction

cfme/test_framework/sentaku_interaction.py

@@ -0,0 +1,29 @@
+"""use_context(*contexts, **kw): wrap the test into appliance.contet.use(*contexts)
+"""
+import pytest
+
+
+def pytest_configure(config):
+    config.addinivalue_line("markers", __doc__.splitlines()[0])
+
+
+@pytest.hookimpl(hookwrapper=True)
+def pytest_runtest_call(item):
+    marker = item.get_marker("use_context")
+    appliance = item.funcargs.get('appliance')
+
+    if marker is None:
+        yield
+    elif appliance is None:
+        yield
+        # warn
+    else:
+        collected_contexts = []
+        for item in marker.args:
+            if isinstance(type, item):
+                collected_contexts.append(item)
+            else:
+                collected_contexts.extend(item)
+
+        with appliance.context.use(*collected_contexts, **marker.kwargs):
+            yield

cfme/tests/ssui/test_ssui_login.py

@@ -1,12 +1,8 @@
 import pytest
-
-from utils.appliance import get_or_create_current_appliance
 from utils.appliance import ViaSSUI
 
-
-@pytest.mark.parametrize('context', [ViaSSUI])
-def test_ssui_login(context):
-    appliance = get_or_create_current_appliance()
-
-    with appliance.context.use(context):
-        appliance.server.login()
+# https://github.com/pytest-dev/pytest/issues/2540
+# the tuple is needed
+@pytest.mark.use_context((ViaSSUI,))
+def test_ssui_login(appliance):
+    appliance.server.login()

conftest.py

@@ -31,6 +31,7 @@ def pytest_collection_finish(session):
     'fixtures.pytest_store',
     'cfme.test_framework.sprout.plugin',
     'cfme.test_framework.appliance_police',
+    'cfme.test_framework.sentaku_interaction',
 
     'fixtures.portset',