Add PD migrator lint & test steps to CI (grafana#1053)

# What this PR does

- Add PD migrator related hooks to `.pre-commit-config.yaml`
- Add Github Actions step for running PD migrator tests

.github/workflows/ci.yml

@@ -151,6 +151,17 @@ jobs:
           pip install -r requirements.txt
           ONCALL_TESTING_RBAC_ENABLED=${{ matrix.rbac_enabled }} pytest -x
 
+  unit-test-pd-migrator:
+    runs-on: ubuntu-latest
+    container: python:3.9
+    steps:
+      - uses: actions/checkout@v2
+      - name: Unit Test PD Migrator
+        run: |
+          cd tools/pagerduty-migrator
+          pip install -r requirements.txt
+          pytest -x
+
   docker-build:
     runs-on: ubuntu-latest
     steps:

.pre-commit-config.yaml

@@ -5,13 +5,20 @@ repos:
       - id: isort
         files: ^engine
         args: [--settings-file=engine/pyproject.toml, --filter-files]
+      - id: isort
+        name: isort - pd-migrator
+        files: ^tools/pagerduty-migrator
+        args: [--settings-file=tools/pagerduty-migrator/.isort.cfg, --filter-files]
 
   - repo: https://github.com/psf/black
     rev: 22.3.0
     hooks:
       - id: black
         files: ^engine
         args: [--config=engine/pyproject.toml]
+      - id: black
+        name: black - pd-migrator
+        files: ^tools/pagerduty-migrator
 
   - repo: https://github.com/pycqa/flake8
     rev: 3.9.2
@@ -21,6 +28,12 @@ repos:
         args: [--config=engine/tox.ini]
         additional_dependencies:
           - flake8-tidy-imports
+      - id: flake8
+        name: flake8 - pd-migrator
+        files: ^tools/pagerduty-migrator
+        # Make sure config is compatible with black
+        # https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#line-length
+        args: [--max-line-length=88, "--select=C,E,F,W,B,B950", "--extend-ignore=E203,E501"]
 
   - repo: https://github.com/pre-commit/mirrors-eslint
     rev: v8.25.0

tools/pagerduty-migrator/migrator/report.py

@@ -105,13 +105,13 @@ def escalation_policy_report(policies: list[dict]) -> str:
     for policy in sorted(
         policies, key=lambda p: bool(p["unmatched_users"] or p["flawed_schedules"])
     ):
-        result += f"\n" + TAB + format_escalation_policy(policy)
+        result += "\n" + TAB + format_escalation_policy(policy)
 
         for user in policy["unmatched_users"]:
-            result += f"\n" + TAB * 2 + format_user(user)
+            result += "\n" + TAB * 2 + format_user(user)
 
         for schedule in policy["flawed_schedules"]:
-            result += f"\n" + TAB * 2 + format_schedule(schedule)
+            result += "\n" + TAB * 2 + format_schedule(schedule)
 
         if (
             not policy["unmatched_users"]
@@ -135,7 +135,7 @@ def integration_report(integrations: list[dict]) -> str:
         key=lambda i: bool(i["oncall_type"] and not i["is_escalation_policy_flawed"]),
         reverse=True,
     ):
-        result += f"\n" + TAB + format_integration(integration)
+        result += "\n" + TAB + format_integration(integration)
         if (
             integration["oncall_type"]
             and not integration["is_escalation_policy_flawed"]

tools/pagerduty-migrator/requirements.txt

@@ -1,6 +1,4 @@
 requests==2.27.1
 pdpyras==4.5.0
-isort==5.10.1
-black==22.3.0
 pytest==7.1.2
 pytest-env==0.6.2