Update tests-windows.yml

pipelines/Windows/tests-windows.yml

@@ -21,6 +21,7 @@ steps:
       version: '$(dotnetVersion)'
 
   - task: ExtractFiles@1
+    displayName: 'Extract SwiftShader drivers'
     inputs:
       archiveFilePatterns: 'tests/TestDrivers/Windows/*.zip'
       destinationFolder: 'tests/TestDrivers/Windows/'
@@ -31,7 +32,16 @@ steps:
     displayName: "Set SwiftShader ICD env variable"
     inputs:
       targetType: 'inline'
-      script: 'echo "##vso[task.setvariable variable=VK_ICD_FILENAMES;]\tests\TestDrivers\Windows\vk_swiftshader_icd.json"'
+      script: 'echo "##vso[task.setvariable variable=VK_ICD_FILENAMES;]$(Build.SourcesDirectory)\tests\TestDrivers\Windows\vk_swiftshader_icd.json"'
+
+  - task: Bash@3
+    displayName: "Show SwiftShader ICD env variable"
+    inputs:
+      targetType: 'inline'
+      script: |
+        echo "SwiftShader ICD env variable set to: $VK_ICD_FILENAMES"
+        echo "Contents of directory:"
+        ls $(Build.SourcesDirectory)/tests/TestDrivers/Windows/
 
   - task: CmdLine@2
     displayName: 'Download WASI SDK'