tests: re-use Fedora tests

Related: rhbz#2001107

.fmf/version

@@ -0,0 +1 @@
+1

tests/build-gating.fmf

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+#
+# Build/PR gating tests for *LLVM 13*
+#
+# Imports and runs tests provided by Fedora LLVM git for the matching LLVM version.
+#
+# NOTE: *always* keep this file in sync with upstream, i.e. Fedora. Since we cannot "discover" a plan,
+# we must duplicate at least some part of upstream plan setup, like `adjust` or `provision`. Not necessarily
+# all steps, but if we do need some of them here, let's focus on making changes in upstream first, to preserve
+# one source of truth. Once TMT learns to include whole plans, we could drop the copied content from here.
+#
+
+summary: python-lit tests for build/PR gating
+adjust:
+  - because: "Plan to be ran when either executed locally, or executed by CI system to gate a build or PR."
+    when: >-
+      trigger is defined
+      and trigger != commit
+      and trigger != build
+    enabled: false
+
+  - because: "When testing SCL-ized LLVM, the collection must be enabled first"
+    environment+:
+      WITH_SCL: "scl enable llvm-toolset-13.0 rust-toolset-1.58"
+    when: "collection == llvm-toolset-13.0"
+
+
+discover:
+  - name: "Upstream python-lit tests for build/PR gating"
+    how: fmf
+    url: https://src.fedoraproject.org/rpms/python-lit.git
+    ref: rawhide
+
+execute:
+    how: tmt
+provision:
+  hardware:
+    memory: ">= 4 GiB"

tests/tests.yml

@@ -1,11 +0,0 @@
-- hosts: localhost
-  roles:
-  - role: standard-test-basic
-    tags:
-      - classic
-    required_packages:
-      - python3-lit
-    tests:
-      - lit:
-          dir: ./
-          run: lit --version