Resolve Pip Related Errors (Azure#12157)

* update build-test invocation to set virtualenv prior to invoking setup_execute_tests

Author: scbedd

eng/ci_tools.txt

@@ -1,6 +1,7 @@
 # requirements leveraged by ci tools
 setuptools==44.1.0; python_version == '2.7'
 setuptools==45.1.0; python_version >= '3.5'
+virtualenv==20.0.24
 wheel==0.34.2 
 Jinja2==2.11.1
 packaging==20.4
@@ -32,4 +33,3 @@ pytest-cov==2.8.1
 ./tools/azure-sdk-tools
 
 
-

eng/pipelines/templates/steps/build-test.yml

@@ -26,27 +26,27 @@ steps:
   - template: /eng/common/pipelines/templates/steps/verify-agent-os.yml
 
   - script: |
-      python -m pip install pip == 20.1
-      pip install -r eng/ci_tools.txt
-      pip --version
+      python -m pip install -r eng/ci_tools.txt
+      mkdir $(Build.SourcesDirectory)/env
+      python -m virtualenv $(Build.SourcesDirectory)/env 
     displayName: 'Prep Environment'
 
   - ${{ parameters.BeforeTestSteps }}
 
-  - task: PythonScript@0
-    displayName: 'Run Tests'
-    inputs:
-      scriptPath: 'scripts/devops_tasks/setup_execute_tests.py'
-      arguments: >-
-        "${{ parameters.BuildTargetingString }}"
-        ${{ parameters.AdditionalTestArgs }}
-        ${{ parameters.CoverageArg }}
-        --mark_arg="${{ parameters.TestMarkArgument }}"
-        --service="${{ parameters.ServiceDirectory }}"
-        --toxenv="${{ parameters.ToxTestEnv }}"
-        --injected-packages="${{ parameters.InjectedPackages }}"
-        ${{ parameters.ToxEnvParallel }}
+  - pwsh: |
+      $env:Path = "$(Build.SourcesDirectory)/env;" + $env:Path
+      python -m pip install pip==20.1
+      python -m pip install -r eng/ci_tools.txt
+      python -m pip --version
+
+      $env:PYTHON_HOME = ""
+      $env:VIRTUAL_ENV = "$(Build.SourcesDirectory)/env"
+
+      Write-Host 'python ./scripts/devops_tasks/setup_execute_tests.py "${{ parameters.BuildTargetingString }}" ${{ parameters.AdditionalTestArgs }} ${{ parameters.CoverageArg }} --mark_arg="${{ parameters.TestMarkArgument }}" --service="${{ parameters.ServiceDirectory }}" --toxenv="${{ parameters.ToxTestEnv }}" --injected-packages="${{ parameters.InjectedPackages }}" ${{ parameters.ToxEnvParallel }}"'
+      python ./scripts/devops_tasks/setup_execute_tests.py "${{ parameters.BuildTargetingString }}" ${{ parameters.AdditionalTestArgs }} ${{ parameters.CoverageArg }} --mark_arg="${{ parameters.TestMarkArgument }}" --service="${{ parameters.ServiceDirectory }}" --toxenv="${{ parameters.ToxTestEnv }}" --injected-packages="${{ parameters.InjectedPackages }}" ${{ parameters.ToxEnvParallel }}
+      
     env: ${{ parameters.EnvVars }}
+    displayName: 'Run Tests'
 
   - ${{ parameters.AfterTestSteps }}