Create test for virtual environment (microsoft#6007)

* Create test for virtual environment

* Figure out why python path test is failing

* Eliminate quotes on venv_path

* Actually set the python path

* Try just printing path on windows

* Print a different variable

* Try other echo patterns

* user powershell commands to append

* Fix prettier

.github/workflows/validation.yml

@@ -2,6 +2,7 @@ name: 'Validation'
 
 env:
   NODE_VERSION: '16' # Shipped with VS Code.
+  PYTHON_VERSION: 3.11
 
 on:
   push:
@@ -107,6 +108,48 @@ jobs:
         run: npm test
         working-directory: packages/pyright-internal
 
+      # Install python so we can create a VENV for tests
+      - name: Use Python ${{env.PYTHON_VERSION}}
+        uses: actions/setup-python@v4
+        id: install_python
+        with:
+          python-version: ${{env.PYTHON_VERSION}}
+
+      - name: Create Venv
+        run: |
+          ${{ steps.install_python.outputs.python-path }} -m venv .venv
+
+      - name: Activate and install pytest (linux)
+        if: runner.os != 'Windows'
+        run: |
+          source .venv/bin/activate
+          python -m pip install pytest
+          python -c "import sys;print('python_venv_path=' + sys.executable)" >> $GITHUB_ENV
+
+      - name: Activate and install pytest (windows)
+        if: runner.os == 'Windows'
+        run: |
+          .venv\scripts\activate
+          python -m pip install pytest
+          python -c "import sys;print('python_venv_path=' + sys.executable)" | Out-File -FilePath $env:GITHUB_ENV -Append
+
+      - name: Echo python_venv_path
+        run: |
+          echo python_venv_path=${{env.python_venv_path}}
+
+      - name: Run import tests with venv
+        env:
+          CI_IMPORT_TEST_VENVPATH: '../../'
+          CI_IMPORT_TEST_VENV: '.venv'
+        run: npm run test:imports
+        working-directory: packages/pyright-internal
+
+      - name: Run import tests with pythonpath
+        env:
+          CI_IMPORT_TEST_PYTHONPATH: ${{env.python_venv_path}}
+        run: npm run test:imports
+        working-directory: packages/pyright-internal
+
   build:
     runs-on: ubuntu-latest
     name: Build

.gitignore

@@ -122,4 +122,7 @@ junit.xml
 
 # OS files
 .DS_Store
-Thumbs.db
+Thumbs.db
+
+# Potential venv
+.venv

packages/pyright-internal/package.json

@@ -12,7 +12,8 @@
         "build": "tsc",
         "clean": "shx rm -rf ./dist ./out",
         "test": "jest --forceExit",
-        "test:coverage": "jest --forceExit --reporters=jest-junit --reporters=default --coverage --coverageReporters=cobertura --coverageReporters=html --coverageReporters=json"
+        "test:coverage": "jest --forceExit --reporters=jest-junit --reporters=default --coverage --coverageReporters=cobertura --coverageReporters=html --coverageReporters=json",
+        "test:imports": "jest importResolver.test --forceExit --runInBand"
     },
     "dependencies": {
         "@iarna/toml": "2.2.5",