support passing "N-#" to rhel_ver_match fixture

pytest_plugins/fixture_markers.py

@@ -35,14 +35,27 @@ def pytest_generate_tests(metafunc):
         # process eventual rhel_version_match markers
         matchers = [i.args for i in function_marks if i.name == 'rhel_ver_match']
         match_params = []
-        for matcher in matchers:
-            match_params.extend(
-                [
-                    setting_rhel_ver
-                    for setting_rhel_ver in settings.supportability.content_hosts.rhel.versions
-                    if re.fullmatch(str(matcher[0]), str(setting_rhel_ver))
-                ]
-            )
+        # check if param matches format 'N-x'
+        if matchers and len(matchers[0][0]) == 3 and matchers[0][0].startswith('N-'):
+            # num of desired prior versions
+            num_versions = int(matchers[0][0].split('-')[1])
+            # grab major versions, excluding fips, from tail of supportability list
+            filtered_versions = [
+                setting_rhel_ver
+                for setting_rhel_ver in settings.supportability.content_hosts.rhel.versions
+                if 'fips' not in str(setting_rhel_ver)
+            ][-(num_versions + 1) :]  # inclusive (+1) to collect N as well
+            match_params.extend(filtered_versions)
+        # match versions with existing markers
+        else:
+            for matcher in matchers:
+                match_params.extend(
+                    [
+                        setting_rhel_ver
+                        for setting_rhel_ver in settings.supportability.content_hosts.rhel.versions
+                        if re.fullmatch(str(matcher[0]), str(setting_rhel_ver))
+                    ]
+                )
         network_params = ['ipv6' if settings.server.is_ipv6 else 'ipv4']
         rhel_params = []
         ids = []

tests/foreman/api/test_errata.py

@@ -509,7 +509,7 @@ def _publish_and_wait(sat, org, cv, search_rate=1, max_tries=10):
 
 @pytest.mark.upgrade
 @pytest.mark.tier3
-@pytest.mark.rhel_ver_match('[^7]|10')
+@pytest.mark.rhel_ver_match('N-2')  # latest 3 major ver supported, exclude fips
 @pytest.mark.no_containers
 @pytest.mark.e2e
 def test_positive_install_in_hc(
@@ -656,7 +656,7 @@ def test_positive_install_in_hc(
 
 
 @pytest.mark.tier3
-@pytest.mark.rhel_ver_match(r'^(?!.*(7|fips)).*$') # exclude any fips or major ver 7
+@pytest.mark.rhel_ver_match(r'^(?!.*(7|fips)).*$')  # exclude any fips or major ver 7
 @pytest.mark.no_containers
 @pytest.mark.e2e
 @pytest.mark.pit_client