add test for test_data.json diff

When adding migrations and adding or modifying fields one might forget to change test_data.json. This test aims to check if that happend by making a new test_data.json and comparing it.

Author: jooooosef

.github/workflows/tests.yml

@@ -39,6 +39,23 @@ jobs:
       - name: Run tests
         run: python manage.py test --shuffle
 
+  test_testdata:
+    name: Test if testdata is up to date
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/setup_evap
+        with:
+          start-db: true
+      - name: Create new test_data.json
+        run: |
+          python manage.py reload_testdata --noinput
+          python manage.py dump_testdata
+      - name: Check if test_data.json changed
+        run: git diff --exit-code
+
   mypy:
     runs-on: ubuntu-22.04