Add support to define which playbook tests to execute with pytest.

pytest provide the means to skip tests based on patterns, but writing
these patterns for ansible-freeipa might not be feasible.

This PR allows the selection of playbook tests and modules that will
be executed with pytest using the environmentt variables IPA_ENABLED_TESTS
IPA_ENABLED_MODULES, IPA_DISABLED_TESTS or IPA_DISABLED_MODULES.

When using IPA_ENABLED_MODULES, all modules will be disabled, and only
the modules in the enabled list will be tested. If using the test
filter, IPA_ENABLED_TESTS, all tests are disabled, unless they are in
the enabled test lists.

If the IPA_DISABLED_* version is used, tests and modules are enabled by
default, and the list is used to disable the module or specific test.

To disable a test or module in Azure CI, edit the file
`tests/azure/variables` and add the desired tests or modules to the
parameter variables `enabled_modules`, 'enabled_tests`, `disabled_tests`
or `disable_modules`.

Note that, if added to the `master` branch, this will affect the tests
for every pipeline that it is include (including 'nightly'), so it should
be used with care.

It can be used with TEMP commits to enable only the desired tests,
speeding up upstream tests.

tests/README.md

@@ -63,6 +63,24 @@ IPA_SERVER_HOST=<ipaserver_host_or_ip> pytest -rs
 
 For a complete list of options check `pytest --help`.
 
+### Disabling and enabling playbook tests
+
+Sometimes it is useful to enable or disable specific playbook tests. To only run a subset of modules or tests, use the variables IPA_ENABLED_MODULES and IPA ENABLED_TESTS, to define a comma-separated list of modules or tests to be enabled. Any test or module not in the list will not be executed. For example, to run only `sudorule` and `sudocmd` tests:
+
+```
+IPA_ENABLE_MODULES="sudorule,sudocmd" IPA_SERVER_HOST=<ipaserver_host_or_ip> pytest
+```
+
+If all but a few selected tests are to be executed, use the IPA_DISABLED_MODULES or IPA_DISABLED_TESTS. For example, to run all, but "test_service_certificate" test:
+
+```
+IPA_DISABLED_TESTS=test_service_certificate IPA_SERVER_HOST=<ipaserver_host_or_ip> pytest
+```
+
+If none of this variables are defined, all tests will be executed.
+
+To configure the tests that will run for your pull request, add a TEMP commit, with the configuration defined in the file `tests/azure/templates/variables.yml`. Set the variables `ipa_enable_modules`, `ipa_enable_tests`, `ipa_disable_modules`, and `ipa_disable_tests`, in the same way as the equivalent environment variables.
+
 ### Types of tests
 
 #### Playbook tests
@@ -119,6 +137,7 @@ molecule destroy -s c8s
 
 See [Running the tests](#running-the-tests) section for more information on available options.
 
+
 ## Upcoming/desired improvements:
 
 * A script to pre-config the complete test environment using virsh.

tests/azure/templates/playbook_tests.yml

@@ -18,11 +18,12 @@ parameters:
   - name: build_number
     type: string
 
-
 jobs:
 - job: Test_Group${{ parameters.group_number }}
   displayName: Run playbook tests ${{ parameters.scenario }} (${{ parameters.group_number }}/${{ parameters.number_of_groups }})
   timeoutInMinutes: 120
+  variables:
+  - template: variables.yaml
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -63,6 +64,10 @@ jobs:
     env:
       IPA_SERVER_HOST: ${{ parameters.scenario }}
       RUN_TESTS_IN_DOCKER: true
+      IPA_DISABLED_MODULES: ${{ variables.disabled_modules }}
+      IPA_DISABLED_TESTS: ${{ variables.disabled_tests }}
+      IPA_ENABLED_MODULES: ${{ variables.enabled_modules }}
+      IPA_ENABLED_TESTS: ${{ variables.enabled_tests }}
 
   - task: PublishTestResults@2
     inputs:

tests/azure/templates/pytest_tests.yml

@@ -53,6 +53,10 @@ jobs:
     env:
       IPA_SERVER_HOST: ${{ parameters.scenario }}
       RUN_TESTS_IN_DOCKER: true
+      IPA_DISABLED_MODULES: ${{ variables.disabled_modules }}
+      IPA_DISABLED_TESTS: ${{ variables.disabled_tests }}
+      IPA_ENABLED_MODULES: ${{ variables.enabled_modules }}
+      IPA_ENABLED_TESTS: ${{ variables.enabled_tests }}
 
   - task: PublishTestResults@2
     inputs:

tests/azure/templates/variables.yaml

+#
+# Variables must be defined as comma separated lists.
+# For easier management of items to enable/disable,
+# use one test/module on each line, followed by a comma.
+#
+# Example:
+#
+# disabled_modules: >-
+#   dnsconfig,
+#   group,
+#   hostgroup
+#
+---
+variables:
+  # ipa_enabled_modules: >-
+  # ipa_enabled_tests: >-
+  # ipa_disabled_modules: >-
+  # ipa_disabled_tests: >-

tests/test_playbook_runs.py

@@ -24,11 +24,12 @@ import functools
 
 from unittest import TestCase
 
-from utils import get_test_playbooks, get_server_host, run_playbook
+from utils import get_test_playbooks, get_skip_conditions, run_playbook
 
 
-def prepare_test(test_name, test_path):
-    """Decorator for the tests generated automatically from playbooks.
+def prepare_test(testname, testpath):
+    """
+    Decorate tests generated automatically from playbooks.
 
     Injects 2 arguments to the test (`test_path` and `test_name`) and
     name the test method using test name (to ensure test reports are useful).
@@ -36,13 +37,13 @@ def prepare_test(test_name, test_path):
     def decorator(func):
         @functools.wraps(func)
         def wrapper(*args, **kwargs):
-            kwargs["test_path"] = test_path
-            kwargs["test_name"] = test_name
+            kwargs["test_path"] = testpath
+            kwargs["test_name"] = testname
             return func(*args, **kwargs)
 
         return wrapper
 
-    decorator.__name__ = test_name
+    decorator.__name__ = testname
     return decorator
 
 
@@ -50,18 +51,21 @@ def prepare_test(test_name, test_path):
 #   test_* methods.
 for test_dir_name, playbooks_in_dir in get_test_playbooks().items():
     _tests = {}
+
     for playbook in playbooks_in_dir:
         test_name = playbook["name"].replace("-", "_")
         test_path = playbook["path"]
 
-        @pytest.mark.skipif(
-            not get_server_host(),
-            reason="Environment variable IPA_SERVER_HOST must be set",
-        )
+        skip = get_skip_conditions(test_dir_name, test_name) or {}
+
+        # pylint: disable=W0621,W0640,W0613
+        @pytest.mark.skipif(**skip)
         @pytest.mark.playbook
         @prepare_test(test_name, test_path)
         def method(self, test_path, test_name):
             run_playbook(test_path)
+        # pylint: enable=W0621,W0640,W0613
 
         _tests[test_name] = method
+
     globals()[test_dir_name] = type(test_dir_name, tuple([TestCase]), _tests,)

tests/utils.py

@@ -45,6 +45,68 @@ def get_server_host():
     return os.getenv("IPA_SERVER_HOST")
 
 
+def get_disabled_test(group_name, test_name):
+    disabled_modules = [
+        disabled.strip()
+        for disabled in os.environ.get("IPA_DISABLED_MODULES", "").split(",")
+    ]
+    disabled_tests = [
+        disabled.strip()
+        for disabled in os.environ.get("IPA_DISABLED_TESTS", "").split(",")
+        if disabled.strip()
+    ]
+
+    if not any([disabled_modules, disabled_tests]):
+        return False
+
+    return group_name in disabled_modules or test_name in disabled_tests
+
+
+def get_enabled_test(group_name, test_name):
+    enabled_modules = [
+        enabled.strip()
+        for enabled in os.environ.get("IPA_ENABLED_MODULES", "").split(":")
+        if enabled.strip()
+    ]
+    enabled_tests = [
+        enabled.strip()
+        for enabled in os.environ.get("IPA_ENABLED_TESTS", "").split(":")
+        if enabled.strip()
+    ]
+
+    if not any([enabled_modules, enabled_tests]):
+        return True
+
+    group_enabled = group_name in enabled_modules
+    test_enabled = test_name in enabled_tests
+
+    return group_enabled or test_enabled
+
+
+def get_skip_conditions(group_name, test_name):
+    """
+    Check tests that need to be skipped.
+
+    The return is a dict containing `condition` and `reason`. For the test
+    to be skipped, `condition` must be True, if it is `False`, the test is
+    to be skipped. Although "reason" must be always provided, it can be
+    `None` if `condition` is True.
+    """
+    if not get_server_host():
+        return {
+            "condition": True,
+            "reason": "Environment variable IPA_SERVER_HOST must be set",
+        }
+
+    if not get_enabled_test(group_name, test_name):
+        return {"condition": True, "reason": "Test not configured to run"}
+
+    if get_disabled_test(group_name, test_name):
+        return {"condition": True, "reason": "Test configured to not run"}
+
+    return {"condition": False, "reason": "Test will run."}
+
+
 def get_inventory_content():
     """Create the content of an inventory file for a test run."""
     ipa_server_host = get_server_host()