Add friendly crash page

tests/test_errors.py

@@ -0,0 +1,47 @@
+import re
+import tempfile
+import unittest
+from pathlib import Path
+
+from app import create_app
+from boker.db import db
+
+
+class ErrorPageTests(unittest.TestCase):
+    def setUp(self):
+        self.tmpdir = tempfile.TemporaryDirectory()
+        db_path = Path(self.tmpdir.name) / "test.sqlite3"
+        self.app = create_app(
+            {
+                "TESTING": True,
+                "PROPAGATE_EXCEPTIONS": False,
+                "SQLALCHEMY_DATABASE_URI": f"sqlite:///{db_path}",
+                "WTF_CSRF_ENABLED": False,
+            }
+        )
+
+        @self.app.get("/explode")
+        def explode():
+            raise RuntimeError("boom")
+
+        self.client = self.app.test_client()
+
+    def tearDown(self):
+        with self.app.app_context():
+            db.session.remove()
+            db.drop_all()
+            db.engine.dispose()
+        self.tmpdir.cleanup()
+
+    def test_unexpected_errors_render_crash_page_with_incident_id(self):
+        response = self.client.get("/explode")
+
+        self.assertEqual(response.status_code, 500)
+        self.assertIn(b"Something went wrong.", response.data)
+        self.assertIn(b"Incident", response.data)
+        self.assertNotIn(b"RuntimeError", response.data)
+        self.assertRegex(response.get_data(as_text=True), re.compile(r"Incident [a-f0-9]{12}"))
+
+
+if __name__ == "__main__":
+    unittest.main()