test(env): add snap test for vp env off/on mode switching

Verifies the full system-first mode lifecycle with assertions:
- `assert-managed` passes in managed mode (uses engines.node 20.18.0)
- `vp env off` switches to system-first mode
- `assert-not-managed` passes (version is NOT 20.18.0)
- `vp env on` restores managed mode
- `assert-managed` passes again (back to 20.18.0)

Author: fengmk2

packages/cli/snap-tests-global/command-env-off-on/package.json

@@ -6,6 +6,7 @@
     "node": "20.18.0"
   },
   "scripts": {
-    "check-node": "node -e \"console.log(process.version)\""
+    "assert-managed": "node src/assert-managed.mjs",
+    "assert-not-managed": "node src/assert-not-managed.mjs"
   }
 }

packages/cli/snap-tests-global/command-env-off-on/snap.txt

@@ -1,8 +1,8 @@
-> vp run check-node # Managed mode: should use project's engines.node (20.18.0)
+> vp run assert-managed # Managed mode: should use project's engines.node 20.18.0
 VITE+ - The Unified Toolchain for the Web
 
-$ node -e "console.log(process.version)" ⊘ cache disabled
-v<semver>
+$ node src/assert-managed.mjs ⊘ cache disabled
+OK: v<semver>
 
 
 > vp env off # Switch to system-first mode
@@ -14,11 +14,11 @@ All vp commands and shims will now prefer system Node.js, falling back to manage
 
 Run `vp env on` to always use Vite+ managed Node.js.
 
-> vp run check-node # System-first mode: should use system Node.js, not project's 20.18.0
+> vp run assert-not-managed # System-first mode: must NOT use 20.18.0
 VITE+ - The Unified Toolchain for the Web
 
-$ node -e "console.log(process.version)" ⊘ cache disabled
-v<semver>
+$ node src/assert-not-managed.mjs ⊘ cache disabled
+OK: v<semver>
 
 
 > vp env on # Switch back to managed mode
@@ -30,9 +30,9 @@ All vp commands and shims will now always use Vite+ managed Node.js.
 
 Run `vp env off` to prefer system Node.js instead.
 
-> vp run check-node # Managed mode restored: should use project's engines.node again
+> vp run assert-managed # Managed mode restored: should use 20.18.0 again
 VITE+ - The Unified Toolchain for the Web
 
-$ node -e "console.log(process.version)" ⊘ cache disabled
-v<semver>
+$ node src/assert-managed.mjs ⊘ cache disabled
+OK: v<semver>
 

packages/cli/snap-tests-global/command-env-off-on/src/assert-managed.mjs

@@ -0,0 +1,6 @@
+// Assert we ARE using the managed Node.js (v20.18.0 from engines.node)
+if (process.version !== 'v20.18.0') {
+  console.error(`Expected managed Node.js v20.18.0, got ${process.version}`);
+  process.exit(1);
+}
+console.log(`OK: ${process.version}`);

packages/cli/snap-tests-global/command-env-off-on/src/assert-not-managed.mjs

@@ -0,0 +1,6 @@
+// Assert we are NOT using the managed Node.js (v20.18.0 from engines.node)
+if (process.version === 'v20.18.0') {
+  console.error(`Expected system Node.js, got managed v20.18.0`);
+  process.exit(1);
+}
+console.log(`OK: ${process.version}`);

packages/cli/snap-tests-global/command-env-off-on/steps.json

@@ -2,11 +2,11 @@
   "serial": true,
   "ignoredPlatforms": ["win32"],
   "commands": [
-    "vp run check-node # Managed mode: should use project's engines.node (20.18.0)",
+    "vp run assert-managed # Managed mode: should use project's engines.node 20.18.0",
     "vp env off # Switch to system-first mode",
-    "vp run check-node # System-first mode: should use system Node.js, not project's 20.18.0",
+    "vp run assert-not-managed # System-first mode: must NOT use 20.18.0",
     "vp env on # Switch back to managed mode",
-    "vp run check-node # Managed mode restored: should use project's engines.node again"
+    "vp run assert-managed # Managed mode restored: should use 20.18.0 again"
   ],
   "after": ["vp env on"]
 }