test(cli): add snap test for shell environment detection

Author: nekomoyi

packages/cli/snap-tests-global/command-env-use-shells/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "command-env-use-shells",
+  "version": "1.0.0",
+  "private": true
+}

packages/cli/snap-tests-global/command-env-use-shells/snap.txt

@@ -0,0 +1,39 @@
+> VP_SHELL=bash vp env use 20.18.0 --no-install # should detect bash and output posix export
+export VP_NODE_VERSION=20.18.0
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=zsh vp env use 20.18.0 --no-install # should detect zsh and output posix export
+export VP_NODE_VERSION=20.18.0
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=fish vp env use 20.18.0 --no-install # should detect fish and output fish export
+set -gx VP_NODE_VERSION <semver>
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=nu vp env use 20.18.0 --no-install # should detect nushell and output nushell export
+$env.VP_NODE_VERSION = "20.18.0"
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=pwsh vp env use 20.18.0 --no-install # should detect powershell and output powershell export
+$env:VP_NODE_VERSION = "20.18.0"
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=cmd vp env use 20.18.0 --no-install # should detect cmd and output cmd export
+set VP_NODE_VERSION=20.18.0
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=BASH vp env use 20.18.0 --no-install # should detect case-insensitive bash
+export VP_NODE_VERSION=20.18.0
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=FISH vp env use 20.18.0 --no-install # should detect case-insensitive fish
+set -gx VP_NODE_VERSION <semver>
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=POWERSHELL vp env use 20.18.0 --no-install # should detect case-insensitive powershell
+$env:VP_NODE_VERSION = "20.18.0"
+Using Node.js v<semver> (resolved from <semver>)
+
+> VP_SHELL=invalid vp env use 20.18.0 --no-install # should fallback to platform default
+export VP_NODE_VERSION=20.18.0
+Using Node.js v<semver> (resolved from <semver>)

packages/cli/snap-tests-global/command-env-use-shells/steps.json

@@ -0,0 +1,18 @@
+{
+  "env": {
+    "VP_ENV_USE_EVAL_ENABLE": "1"
+  },
+  "ignoredPlatforms": ["win32"],
+  "commands": [
+    "VP_SHELL=bash vp env use 20.18.0 --no-install # should detect bash and output posix export",
+    "VP_SHELL=zsh vp env use 20.18.0 --no-install # should detect zsh and output posix export",
+    "VP_SHELL=fish vp env use 20.18.0 --no-install # should detect fish and output fish export",
+    "VP_SHELL=nu vp env use 20.18.0 --no-install # should detect nushell and output nushell export",
+    "VP_SHELL=pwsh vp env use 20.18.0 --no-install # should detect powershell and output powershell export",
+    "VP_SHELL=cmd vp env use 20.18.0 --no-install # should detect cmd and output cmd export",
+    "VP_SHELL=BASH vp env use 20.18.0 --no-install # should detect case-insensitive bash",
+    "VP_SHELL=FISH vp env use 20.18.0 --no-install # should detect case-insensitive fish",
+    "VP_SHELL=POWERSHELL vp env use 20.18.0 --no-install # should detect case-insensitive powershell",
+    "VP_SHELL=invalid vp env use 20.18.0 --no-install # should fallback to platform default"
+  ]
+}