Use osci for gating

ci.fmf

@@ -1,7 +0,0 @@
-summary: Tier1 tests
-discover:
-    how: fmf
-    repository: git://pkgs.devel.redhat.com/tests/python-pygments
-    filter: 'tier:1'
-execute:
-    how: tmt

gating.yaml

@@ -1,6 +1,8 @@
 --- !Policy
+
 product_versions:
   - rhel-8
 decision_context: osci_compose_gate
 rules:
-  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.other.functional}
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}
+

plan.fmf

@@ -0,0 +1,13 @@
+discover:
+  how: shell
+  dist-git-source: true
+  tests:
+  - name: unit
+    test: |
+      cd $(dirname $TMT_SOURCE_DIR/Pygments-*/tests)
+      /usr/libexec/platform-python tests/run.py -d -v
+    require:
+    - python3-nose
+
+execute:
+  how: tmt