improve the unit test logic to hopefully prevent git diff errors

.github/workflows/CI_build.yml

@@ -20,27 +20,27 @@ jobs:
   validate:
     runs-on: windows-latest
     steps:
-    - name: Checkout repo
+    - name: 🚚 Checkout repo
       uses: actions/checkout@v6
 
-    - name: Set up Python 3.13
+    - name: 📡 Set up Python 3.13
       uses: actions/setup-python@v6
       with:
         python-version: '3.13' # Uses the latest patch version of the given
 
-    - name: Install python modules
+    - name: 📡 Install python modules
       working-directory: .
       run: python -m pip install -r requirements.txt
 
-    - name: Validate folders of XML types (UDLs, autoCompletion, functionList)
+    - name: 🏃 Validate folders of XML types (UDLs, autoCompletion, functionList)
       working-directory: .
       run: python .validators\validator_xml.py
 
-    - name: Validate json and rebuild udl-list.md
+    - name: 🏃 Validate json and rebuild udl-list.md
       working-directory: .
       run: python .validators\validator_json.py
 
-    - name: Generate autoCompletion for all UDLs that don't already have one, and revalidate (primary repo + branch only)
+    - name: 🔨 Generate autoCompletion for all UDLs that don't already have one, and revalidate (primary repo + branch only)
       working-directory: .
       if: ${{ contains('push workflow_dispatch', github.event_name) && github.ref == 'refs/heads/master' && github.repository == 'notepad-plus-plus/userDefinedLanguages' }}
       run: |
@@ -50,32 +50,39 @@ jobs:
         # since AC may have been added to JSON, need to revalidate JSON and re-generate md
         python .validators\validator_json.py
 
-    - name: Update repo with automated changes for the UDL list and autoCompletions
+    - name: 🎉 Update repo with automated changes for the UDL list and autoCompletions
       uses: stefanzweifel/git-auto-commit-action@v7
       if: contains('push workflow_dispatch', github.event_name)
       with:
         commit_message: Automatically re-build udl-list.md and add new autoCompletions
 
   unitTest:
+    name: FunctionList Unit Tests
     runs-on: windows-latest
     needs: validate
     steps:
-    - name: Checkout repo
+    - name: 🚚 Checkout repo
       uses: actions/checkout@v6
       with:
         fetch-depth: 0
 
-    - name: Check for Changes in functionList Files
+    - name: 🔍 Check for Changes in functionList Files
       id: get_changes
       working-directory: .
       run: |
         # start assuming no changed FL files
         $any_changed = $false
         #
+        # validate event IDs before passing them to git diff:
+        git rev-parse --quiet --verify "${{ github.event.before }}^{commit}" >$null 2>&1
+        $invalid1 = $LASTEXITCODE -ne 0
+        git rev-parse --quiet --verify "${{ github.event.after  }}^{commit}" >$null 2>&1
+        $invalid2 = $LASTEXITCODE -ne 0
         # grab the changes
         if("${{ github.event_name }}" -eq "workflow_dispatch" -or
             "${{ github.event.before }}" -eq "0000000000000000000000000000000000000000" -or
-            "${{ github.event.after }}" -eq "0000000000000000000000000000000000000000") {
+            "${{ github.event.after }}" -eq "0000000000000000000000000000000000000000" -or
+            $invalid1 -or $invalid2 ) {
           #Write-Output "non-push or invalid object: use HEAD~1..HEAD, which isn't as specific, but better than nothing"
           $changed_files = @( git diff --name-only HEAD~1..HEAD )
         } else {
@@ -97,12 +104,13 @@ jobs:
           echo "is_fl_changed=True" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
         }
 
-    - name: Install Notepad++
+    - name: 🦎 Install Notepad++
       if: ${{ steps.get_changes.outputs.is_fl_changed }}
       uses: crazy-max/ghaction-chocolatey@v3
       with:
         args: install -y notepadplusplus
-    - name: Run FunctionList Unit Tests
+
+    - name: 🏃 Run FunctionList Unit Tests
       if: ${{ steps.get_changes.outputs.is_fl_changed }}
       working-directory: .\Test
       run: |