test: Run only tests affected by changed files

.github/workflows/api-pull-request.yml

@@ -66,6 +66,14 @@ jobs:
           opts: --no-input --dry-run --check
         run: make django-make-migrations
 
+      - name: Restore cached testmon data
+        id: cache-testmon-restore
+        uses: actions/cache/restore@v3
+        with:
+          path: |
+            /home/runner/work/flagsmith/flagsmith/api/
+          key: testmon-data
+
       - name: Run Tests
         env:
           DOTENV_OVERRIDE_FILE: .env-ci
@@ -78,3 +86,11 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           env_vars: PYTHON
+
+      - name: Save testmon data cache
+        id: cache-testmon-save
+        uses: actions/cache/save@v3
+        with:
+          path: |
+            /home/runner/work/flagsmith/flagsmith/api/.testmondata
+          key: testmon-data

.gitignore

@@ -23,3 +23,6 @@ src/CI_COMMIT_SHA
 .DS_Store
 .idea
 *.iml
+api/.testmondata
+api/.testmondata-shm
+api/.testmondata-wal

api/.env-ci

@@ -1,3 +1,3 @@
 DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres
 ANALYTICS_DATABASE_URL=postgres://postgres:postgres@localhost:5432/analytics
-PYTEST_ADDOPTS=--cov . --cov-report xml -n auto --dist worksteal
+PYTEST_ADDOPTS=--cov . --cov-report xml -n auto --dist worksteal --testmon

api/pyproject.toml

@@ -129,6 +129,7 @@ pip-tools = "~6.13.0"
 pytest-cov = "~4.1.0"
 datamodel-code-generator = "~0.22"
 requests-mock = "^1.11.0"
+pytest-testmon = "^2.0.13"
 
 [build-system]
 requires = ["poetry-core>=1.5.0"]