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.

pulumi-tests/lib/assert_nonempty.py

@@ -0,0 +1,32 @@
+"""Non-empty output validation for pulumi-vsphere stack results."""
+
+from __future__ import annotations
+
+from typing import Any
+
+
+def _is_empty(value: Any) -> bool:
+    if value is None:
+        return True
+    if isinstance(value, str) and not value.strip():
+        return True
+    if isinstance(value, (list, dict, tuple, set)) and len(value) == 0:
+        return True
+    return False
+
+
+def assert_nonempty(outputs: dict[str, Any], *, required: list[str] | None = None) -> list[str]:
+    """Return list of error messages for empty/missing outputs."""
+
+    errors: list[str] = []
+    keys = required if required is not None else list(outputs)
+    if not keys:
+        errors.append("no outputs exported")
+        return errors
+    for key in keys:
+        if key not in outputs:
+            errors.append(f"missing output: {key}")
+            continue
+        if _is_empty(outputs[key]):
+            errors.append(f"empty output: {key}={outputs[key]!r}")
+    return errors