Add tmt gating plan

Cherry-picked from python3.11-PyMySQL db207444c9844fcb22b827c887faee56fcb01bc7
db207444c9

.fmf/version

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+1

gating.yaml

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+--- !Policy
+
+product_versions:
+  - rhel-8
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

plan.fmf

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+execute:
+  how: tmt
+discover:
+  - how: shell
+    tests:
+     - name: simple import
+       test: python3.12 -c 'import pymysql'
+  - how: fmf

tests/smoke_test.fmf

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+require:
+- mariadb-server
+- python3.12-PyMySQL
+
+test: |
+  systemctl start mariadb &&
+  python3.12 smoke_test.py &&
+  systemctl stop mariadb

tests/smoke_test.py

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+#!/usr/bin/python3
+# Modified from
+# https://github.com/PyMySQL/PyMySQL/blob/v1.0.2/example.py
+
+import pymysql
+connection = pymysql.connect(unix_socket="/var/lib/mysql/mysql.sock", db="mysql")
+cursor = connection.cursor()
+cursor.execute("SELECT Host,User FROM user")
+print(cursor.description)
+
+cursor.close()
+connection.close()