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diff --git a/packages/meshbay-node/tests/test_packaging_win.py b/packages/meshbay-node/tests/test_packaging_win.py
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+++ b/packages/meshbay-node/tests/test_packaging_win.py
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+"""
+The Windows installer (W4): a single per-user NSIS package carrying the Electron
+client and the frozen node daemon.
+
+Like test_packaging_units.py this reads the config rather than building anything
+— there is no electron-builder or PyInstaller run here. Weak evidence, and the
+right kind for the defects it guards against: a per-machine flag that would make
+the installer demand admin, a build step wired to the wrong file, the 150 MB
+node-runtime artifact slipping into git, the autostart seam between the NSIS
+uninstaller and meshbay_node.platform drifting apart.
+"""
+
+import json
+import re
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parents[3]
+CLIENT = ROOT / "packages" / "meshbay-client"
+PKG_JSON = CLIENT / "package.json"
+WIN = ROOT / "packaging" / "win"
+NSH = CLIENT / "build" / "installer.nsh"
+
+pytestmark = pytest.mark.skipif(
+    not PKG_JSON.exists() or not WIN.exists(),
+    reason="Windows packaging not present")
+
+
+def _pkg() -> dict:
+    return json.loads(PKG_JSON.read_text(encoding="utf-8"))
+
+
+# ── electron-builder: Windows target ────────────────────────────────────────
+
+def test_the_windows_target_is_nsis_with_the_committed_icon():
+    win = _pkg()["build"]["win"]
+    assert win["target"] == "nsis"
+    icon = CLIENT / win["icon"]
+    assert icon.suffix == ".ico" and icon.exists(), f"{icon} is missing"
+
+
+def test_the_installer_is_per_user_and_never_asks_for_admin():
+    """
+    A logon-triggered scheduled task needs elevation (that is why W3 uses the
+    Startup folder), and the whole desktop design is no-admin. perMachine or
+    allowElevation here would undo that at install time.
+    """
+    nsis = _pkg()["build"]["nsis"]
+    assert nsis["oneClick"] is False
+    assert nsis["perMachine"] is False
+    assert nsis["allowElevation"] is False
+    assert nsis["allowToChangeInstallationDirectory"] is True
+
+
+def test_the_node_runtime_is_carried_as_an_extraresource():
+    """
+    PyInstaller output lands in packages/meshbay-client/node-runtime/ and rides
+    into the package under resources/node-runtime/. src/main.js:findNodeBinary
+    resolves exactly that path (process.resourcesPath / node-runtime /
+    meshbay-node.exe), so the two names must agree.
+    """
+    extra = _pkg()["build"]["win"]["extraResources"]
+    entry = next((e for e in extra if e.get("to") == "node-runtime"), None)
+    assert entry, "no extraResources entry mapping to node-runtime"
+    assert entry["from"] == "node-runtime"
+
+    main_js = (CLIENT / "src" / "main.js").read_text(encoding="utf-8")
+    assert "'node-runtime', 'meshbay-node.exe'" in main_js, (
+        "findNodeBinary no longer looks for the bundled daemon where "
+        "extraResources puts it")
+
+
+def test_dist_win_delegates_to_the_build_script():
+    """`dist` (Linux) delegates to build-client.sh; `dist:win` is its
+    counterpart and must not be a second inline electron-builder invocation."""
+    scripts = _pkg()["scripts"]
+    assert "dist:win" in scripts
+    assert "build-win.ps1" in scripts["dist:win"]
+    # `dist` stays Linux-only and unchanged (test_desktop_shell.py guards it too).
+    assert "win" not in scripts["dist"].lower()
+
+
+# ── the build scripts exist and point at real files ────────────────────────
+
+@pytest.mark.parametrize("name", [
+    "build-win.ps1",
+    "build-node-runtime.ps1",
+    "meshbay-node.spec",
+    "node-entry.py",
+    "README.md",
+])
+def test_packaging_win_ships_its_scripts(name):
+    assert (WIN / name).exists(), f"packaging/win/{name} is missing"
+
+
+def test_the_pyinstaller_entry_point_is_the_daemon_main():
+    src = (WIN / "node-entry.py").read_text(encoding="utf-8")
+    assert "from meshbay_node.daemon import main" in src
+    assert "main()" in src
+
+
+def test_the_spec_pulls_in_the_awkward_dependencies_whole():
+    """
+    The C/Rust-extension and dynamic-import packages are the ones PyInstaller's
+    static pass drops. If someone trims collect_all to shrink the build, the
+    frozen daemon fails at runtime, not at build time.
+    """
+    spec = (WIN / "meshbay-node.spec").read_text(encoding="utf-8")
+    for pkg in ("aiortc", "av", "aioquic", "pydantic_core", "uvicorn",
+                "watchdog", "guessit", "blake3", "meshbay_node", "meshbay_common"):
+        assert re.search(rf'["\']{re.escape(pkg)}["\']', spec), (
+            f"{pkg} dropped from the PyInstaller spec's collect list")
+
+
+# ── the artifact never gets committed ──────────────────────────────────────
+
+def test_the_node_runtime_output_is_gitignored():
+    """It is ~150 MB of frozen Python. The `ui/` fork guard in
+    test_desktop_shell.py exists for the same reason."""
+    gitignore = (ROOT / ".gitignore").read_text(encoding="utf-8")
+    assert "packages/meshbay-client/node-runtime/" in gitignore
+
+
+# ── the NSIS ↔ platform.py autostart seam ─────────────────────────────────
+
+def test_the_uninstaller_clears_the_autostart_launcher():
+    """
+    W3's `meshbay-node autostart install` drops a .vbs in the Startup folder
+    (meshbay_node.platform._startup_vbs). After an uninstall it would point
+    wscript at a deleted binary every sign-in, so customUnInstall must delete
+    it — and at the path platform.py actually uses.
+    """
+    from meshbay_node import platform as plat
+
+    nsh = NSH.read_text(encoding="utf-8")
+    assert "!macro customUnInstall" in nsh
+    assert "taskkill /IM meshbay-node.exe /F" in nsh
+
+    # The tail platform.py builds, made NSIS-relative ($APPDATA == %APPDATA%).
+    tail = plat._startup_vbs()
+    parts = tail.parts
+    i = parts.index("Microsoft")
+    rel = "\\".join(parts[i:])                       # Microsoft\...\Startup\MeshBay Node.vbs
+    assert rel in nsh, (
+        f"customUnInstall does not delete {rel!r} — the W3 autostart path "
+        "changed and installer.nsh was not updated")
+
+
+def test_customInstall_stops_a_running_daemon_before_overwriting_it():
+    nsh = NSH.read_text(encoding="utf-8")
+    body = nsh.split("!macro customInstall", 1)[1].split("!macroend", 1)[0]
+    assert "taskkill /IM meshbay-node.exe /F" in body