Reconcile reef bindings and evidence

tests/test_binding_projection.py

@@ -0,0 +1,65 @@
+import importlib.util
+from pathlib import Path
+
+import yaml
+
+
+MODULE = Path(__file__).parents[1] / "tools/check_binding_projection.py"
+SPEC = importlib.util.spec_from_file_location("binding_projection", MODULE)
+binding_projection = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(binding_projection)
+
+
+def write_yaml(path: Path, value: dict) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(yaml.safe_dump(value, sort_keys=False), encoding="utf-8")
+
+
+def test_matching_projection_passes(tmp_path):
+    repo = tmp_path / "reef-example"
+    write_yaml(
+        repo / "declarations/reef.yaml",
+        {"reef_id": "reef-example", "hosted_rails": ["rail-kubernetes"]},
+    )
+    write_yaml(
+        repo / "bindings/rails.yaml",
+        {"hosted_rails": [{"rail_id": "rail-kubernetes"}]},
+    )
+    write_yaml(
+        repo / "bindings/rapps.yaml",
+        {"bound_rapps": [{"rapp_id": "rapp-example"}]},
+    )
+    write_yaml(
+        tmp_path / "rail-kubernetes/declarations/rail.yaml",
+        {"rail_id": "rail-kubernetes"},
+    )
+    write_yaml(
+        tmp_path / "rapp-example/declarations/rapp.yaml",
+        {"rapp_id": "rapp-example", "bound_reefs": ["reef-example"]},
+    )
+
+    assert binding_projection.assess(repo, tmp_path) == []
+
+
+def test_stale_rapp_projection_fails(tmp_path):
+    repo = tmp_path / "reef-example"
+    write_yaml(
+        repo / "declarations/reef.yaml",
+        {"reef_id": "reef-example", "hosted_rails": ["rail-kubernetes"]},
+    )
+    write_yaml(
+        repo / "bindings/rails.yaml",
+        {"hosted_rails": [{"rail_id": "rail-kubernetes"}]},
+    )
+    write_yaml(repo / "bindings/rapps.yaml", {"bound_rapps": []})
+    write_yaml(
+        tmp_path / "rail-kubernetes/declarations/rail.yaml",
+        {"rail_id": "rail-kubernetes"},
+    )
+    write_yaml(
+        tmp_path / "rapp-example/declarations/rapp.yaml",
+        {"rapp_id": "rapp-example", "bound_reefs": ["reef-example"]},
+    )
+
+    failures = binding_projection.assess(repo, tmp_path)
+    assert failures and "rapp projection differs" in failures[0]