test: compare manifest version with package metadata

tests/test_manifest.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
+import tomllib
 import unittest
 
 from govoplan_workflow.backend.manifest import get_manifest
@@ -11,7 +12,8 @@ class WorkflowManifestTests(unittest.TestCase):
         manifest = get_manifest()
 
         self.assertEqual("workflow", manifest.id)
-        self.assertEqual("0.1.22", manifest.version)
+        project = tomllib.loads((Path(__file__).parents[1] / "pyproject.toml").read_text())
+        self.assertEqual(project["project"]["version"], manifest.version)
         self.assertEqual(("workflow_engine",), manifest.dependencies)
         self.assertEqual(
             {"workflow.definition_graph", "workflow.definition_catalogue", "workflow.bpmn_interchange"},