add envFile's pythonpath before running tests (microsoft#22269)

fixes microsoft#22231

---------

Co-authored-by: Karthik Nadig <kanadig@microsoft.com>

Author: eleanorjboyd

src/client/testing/testController/common/server.ts

@@ -182,7 +182,8 @@ export class PythonTestServer implements ITestServer, Disposable {
         const { uuid } = options;
         const isDiscovery = (testIds === undefined || testIds.length === 0) && runTestIdPort === undefined;
         const mutableEnv = { ...env };
-        const pythonPathParts: string[] = process.env.PYTHONPATH?.split(path.delimiter) ?? [];
+        // get python path from mutable env, it contains process.env as well
+        const pythonPathParts: string[] = mutableEnv.PYTHONPATH?.split(path.delimiter) ?? [];
         const pythonPathCommand = [options.cwd, ...pythonPathParts].join(path.delimiter);
         mutableEnv.PYTHONPATH = pythonPathCommand;
         mutableEnv.TEST_UUID = uuid.toString();

src/client/testing/testController/pytest/pytestDiscoveryAdapter.ts

@@ -73,7 +73,8 @@ export class PytestTestDiscoveryAdapter implements ITestDiscoveryAdapter {
         const mutableEnv = {
             ...(await this.envVarsService?.getEnvironmentVariables(uri)),
         };
-        const pythonPathParts: string[] = process.env.PYTHONPATH?.split(path.delimiter) ?? [];
+        // get python path from mutable env, it contains process.env as well
+        const pythonPathParts: string[] = mutableEnv.PYTHONPATH?.split(path.delimiter) ?? [];
         const pythonPathCommand = [fullPluginPath, ...pythonPathParts].join(path.delimiter);
         mutableEnv.PYTHONPATH = pythonPathCommand;
         mutableEnv.TEST_UUID = uuid.toString();

src/client/testing/testController/pytest/pytestExecutionAdapter.ts

@@ -109,8 +109,11 @@ export class PytestTestExecutionAdapter implements ITestExecutionAdapter {
         const { pytestArgs } = settings.testing;
         const cwd = settings.testing.cwd && settings.testing.cwd.length > 0 ? settings.testing.cwd : uri.fsPath;
         // get and edit env vars
-        const mutableEnv = { ...(await this.envVarsService?.getEnvironmentVariables(uri)) };
-        const pythonPathParts: string[] = process.env.PYTHONPATH?.split(path.delimiter) ?? [];
+        const mutableEnv = {
+            ...(await this.envVarsService?.getEnvironmentVariables(uri)),
+        };
+        // get python path from mutable env, it contains process.env as well
+        const pythonPathParts: string[] = mutableEnv.PYTHONPATH?.split(path.delimiter) ?? [];
         const pythonPathCommand = [fullPluginPath, ...pythonPathParts].join(path.delimiter);
         mutableEnv.PYTHONPATH = pythonPathCommand;
         mutableEnv.TEST_UUID = uuid.toString();