Added test for making sure all JSON files are valid JSON

Author: o-l-a-v

.github/workflows/ci-test.yml

@@ -2,19 +2,19 @@ name: CI Tests
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ main ]
+    branches: [main]
   merge_group:
-    types: [ checks_requested ]
+    types: [checks_requested]
 
 jobs:
   ci:
     name: node
     strategy:
       matrix:
-        os: [ windows-latest, macos-latest, ubuntu-latest ]
+        os: [windows-latest, macos-latest, ubuntu-latest]
     runs-on: ${{ matrix.os }}
     env:
       DOTNET_NOLOGO: true
@@ -33,6 +33,10 @@ jobs:
         with:
           path: vscode-powershell
 
+      - name: Make sure JSON files are valid
+        shell: pwsh
+        run: ./vscode-powershell/tools/testValidJson.ps1
+
       - name: Install dotnet
         uses: actions/setup-dotnet@v4
         with:

tools/testValidJson.ps1

@@ -0,0 +1,46 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+<#
+    .SYNOPSIS
+        Get all JSON files recursively and test if they are valid by trying to import them.
+
+    .EXAMPLE
+        & $psEditor.GetEditorContext().CurrentFile.Path -WorkingDir '.\'
+#>
+
+# Input and expected output
+[OutputType([System.Void])]
+Param(
+    [Parameter()]
+    [ValidateScript({[System.IO.Directory]::Exists($_)})]
+    [string] $WorkingDir = '.\'
+)
+
+# PowerShell preferences
+$ErrorActionPreference = 'Stop'
+
+# Try to import all JSON files in the repo
+$TestValidJson = [PSCustomObject[]](
+    [System.IO.Directory]::GetFiles($WorkingDir,'*.json',[System.IO.SearchOption]::AllDirectories).ForEach{
+        [PSCustomObject]@{
+            'Path'        = [string] $_
+            'IsValidJson' = [bool]$(
+                Try {
+                    $null = ConvertFrom-Json -InputObject (Get-Content -Raw -Path $_) -AsHashtable
+                    $?
+                }
+                Catch {
+                    $false
+                }
+            )
+        }
+    }
+)
+
+# Output results
+$TestValidJson | Format-Table
+
+# Throw if errors were found
+if ($TestValidJson.Where{-not $_.'IsValidJson'}.'Count' -gt 0) {
+    Throw ('Found {0} non-valid JSON file(s).' -f $TestValidJson.Where{-not $_.'IsValidJson'}.'Count')
+}