Initial commit: VMware vSphere API simulator scaffold.

Add the FastAPI app, PostgreSQL migrations, Docker/Helm packaging, API
contracts, docs, client examples, and the unit/integration/compatibility
test suite for local client and tooling labs without a real vCenter.

tests/unit/test_contract_catalog.py

@@ -0,0 +1,109 @@
+"""Contract catalog helpers."""
+
+from datetime import UTC, datetime
+from pathlib import Path
+from typing import Any, cast
+
+import pytest
+
+from app.config import Settings
+from app.contracts.model import Method, Parameter, PathContract, Schema, Snapshot
+from app.web.contract_catalog import catalog_payload, list_majors, method_payload
+
+
+def _snapshot() -> Snapshot:
+    method = Method(
+        verb="POST",
+        name="create",
+        description="Create a VM.",
+        parameters=(
+            Parameter(name="node", definition=Schema(type="string")),
+            Parameter(name="vmid", definition=Schema(type="integer", minimum=100)),
+            Parameter(name="name", definition=Schema(type="string")),
+            Parameter(name="memory", definition=Schema(type="integer", optional=True)),
+            Parameter(name="scsi[n]", definition=Schema(type="string", optional=True)),
+        ),
+        returns=Schema(type="string"),
+        checksum="a" * 64,
+    )
+    return Snapshot(
+        source_version="9.2.3",
+        retrieved_at=datetime(2026, 1, 1, tzinfo=UTC),
+        raw_sha256="b" * 64,
+        paths=(PathContract(path="/nodes/{node}/qemu", methods=(method,)),),
+        path_count=1,
+        method_count=1,
+    )
+
+
+def test_list_majors_includes_latest_releases() -> None:
+    payload = list_majors(runtime_version="9.2.3")
+    majors_list = cast(list[dict[str, Any]], payload["majors"])
+    majors = {item["major"] for item in majors_list}
+    series = {item["series"] for item in majors_list}
+    assert majors == {6, 7, 8, 9}
+    assert series == {
+        "vSphere 7.0",
+        "vSphere 7.0 U3",
+        "vSphere 8.0",
+        "vSphere 8.0 U2",
+    }
+    assert payload["runtime_version"] == "9.2.3"
+
+
+def test_list_majors_includes_artifact_urls() -> None:
+    payload = list_majors(runtime_version="9.2.3")
+    majors_list = cast(list[dict[str, Any]], payload["majors"])
+    release = next(item for item in majors_list if item["major"] == 9)
+    assert release["series"] == "vSphere 8.0 U2"
+    assert release["artifact_url"] == "stub://vmware/vsphere-8.0u2/api-contract"
+    assert release["bundled"] is True
+
+
+def test_list_majors_honors_settings_overrides() -> None:
+    settings = Settings(catalog_artifact_url_9="https://example.test/vsphere/apidoc.js")
+    payload = list_majors(runtime_version=None, settings=settings)
+    majors_list = cast(list[dict[str, Any]], payload["majors"])
+    release = next(item for item in majors_list if item["major"] == 9)
+    assert release["artifact_url"] == "https://example.test/vsphere/apidoc.js"
+
+
+def test_catalog_payload_groups_paths_by_tag() -> None:
+    payload = catalog_payload(
+        _snapshot(),
+        9,
+        implemented_methods=frozenset({("/nodes/{node}/qemu", "POST")}),
+    )
+    assert payload["source_version"] == "9.2.3"
+    assert payload["series"] == "vSphere 8.0 U2"
+    assert cast(str, payload["artifact_url"]).endswith("vsphere-8.0u2/api-contract")
+    assert payload["latest_version"] == "9.2.3"
+    assert payload["path_count"] == 1
+    categories = cast(list[dict[str, Any]], payload["categories"])
+    method = categories[0]["paths"][0]["methods"][0]
+    assert method["verb"] == "POST"
+    assert method["implemented"] is True
+
+
+def test_method_payload_builds_examples() -> None:
+    payload = method_payload(
+        _snapshot(),
+        major=9,
+        path="/nodes/{node}/qemu",
+        verb="POST",
+        runtime_version="9.2.3",
+        implemented_methods=frozenset({("/nodes/{node}/qemu", "POST")}),
+    )
+    assert payload["resolved_path"] == "/nodes/pve01/qemu"
+    assert payload["body_example"] == {"vmid": 100, "name": "example"}
+    assert payload["implemented"] is True
+
+
+@pytest.mark.asyncio
+async def test_load_snapshot_uses_bundled_revision() -> None:
+    from app.web import contract_catalog
+
+    contract_catalog._SNAPSHOT_CACHE.clear()
+    root = Path("contracts")
+    snapshot = await contract_catalog.load_snapshot(9, root)
+    assert snapshot.source_version == "9.2.3"