Python Environments Project Support for Unittest Execution

src/client/testing/common/debugLauncher.ts

@@ -177,7 +177,7 @@ export class DebugLauncher implements ITestDebugLauncher {
             include: false,
         });
 
-        DebugLauncher.applyDefaults(debugConfig!, workspaceFolder, configSettings);
+        DebugLauncher.applyDefaults(debugConfig!, workspaceFolder, configSettings, options.cwd);
 
         return this.convertConfigToArgs(debugConfig!, workspaceFolder, options);
     }
@@ -224,14 +224,17 @@ export class DebugLauncher implements ITestDebugLauncher {
         cfg: LaunchRequestArguments,
         workspaceFolder: WorkspaceFolder,
         configSettings: IPythonSettings,
+        optionsCwd?: string,
     ) {
         // cfg.pythonPath is handled by LaunchConfigurationResolver.
 
         if (!cfg.console) {
             cfg.console = 'internalConsole';
         }
         if (!cfg.cwd) {
-            cfg.cwd = configSettings.testing.cwd || workspaceFolder.uri.fsPath;
+            // For project-based testing, use the project's cwd (optionsCwd) if provided.
+            // Otherwise fall back to settings.testing.cwd or the workspace folder.
+            cfg.cwd = optionsCwd || configSettings.testing.cwd || workspaceFolder.uri.fsPath;
         }
         if (!cfg.env) {
             cfg.env = {};

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

@@ -5,7 +5,7 @@ import { CancellationToken, TestController, Uri, MarkdownString } from 'vscode';
 import * as util from 'util';
 import { DiscoveredTestPayload } from './types';
 import { TestProvider } from '../../types';
-import { traceError } from '../../../logging';
+import { traceError, traceWarn } from '../../../logging';
 import { Testing } from '../../../common/utils/localize';
 import { createErrorTestItem } from './testItemUtilities';
 import { buildErrorNodeOptions, populateTestTree } from './utils';
@@ -93,6 +93,28 @@ export class TestDiscoveryHandler {
 
         traceError(testingErrorConst, 'for workspace: ', workspacePath, '\r\n', error?.join('\r\n\r\n') ?? '');
 
+        // For unittest in project-based mode, check if the error might be caused by nested project imports
+        // This helps users understand that import errors from nested projects can be safely ignored
+        // if those tests are covered by a different project with the correct environment.
+        if (testProvider === 'unittest' && projectId) {
+            const errorText = error?.join(' ') ?? '';
+            const isImportError =
+                errorText.includes('ModuleNotFoundError') ||
+                errorText.includes('ImportError') ||
+                errorText.includes('No module named');
+
+            if (isImportError) {
+                const warningMessage =
+                    '--- ' +
+                    `[test-by-project] Import error during unittest discovery for project at ${workspacePath}. ` +
+                    'This may be caused by test files in nested project directories that require different dependencies. ' +
+                    'If these tests are discovered successfully by their own project (with the correct Python environment), ' +
+                    'this error can be safely ignored. To avoid this, consider excluding nested project paths from parent project discovery. ' +
+                    '---';
+                traceWarn(warningMessage);
+            }
+        }
+
         const errorNodeId = projectId
             ? `${projectId}${PROJECT_ID_SEPARATOR}DiscoveryError:${workspacePath}`
             : `DiscoveryError:${workspacePath}`;

src/client/testing/testController/controller.ts

@@ -794,7 +794,7 @@ export class PythonTestController implements ITestController, IExtensionSingleAc
         }
 
         // Check if we're in project-based mode and should use project-specific execution
-        if (this.projectRegistry.hasProjects(workspace.uri) && settings.testing.pytestEnabled) {
+        if (this.projectRegistry.hasProjects(workspace.uri)) {
             const projects = this.projectRegistry.getProjectsArray(workspace.uri);
             await executeTestsForProjects(projects, testItems, runInstance, request, token, {
                 projectRegistry: this.projectRegistry,

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

@@ -109,7 +109,7 @@ export class PytestTestDiscoveryAdapter implements ITestDiscoveryAdapter {
             // Execute using environment extension if available
             if (useEnvExtension()) {
                 traceInfo(`Using environment extension for pytest discovery in workspace ${uri.fsPath}`);
-                const pythonEnv = await getEnvironment(uri);
+                const pythonEnv = project?.pythonEnvironment ?? (await getEnvironment(uri));
                 if (!pythonEnv) {
                     traceError(
                         `Python environment not found for workspace ${uri.fsPath}. Cannot proceed with test discovery.`,

src/client/testing/testController/unittest/testDiscoveryAdapter.ts

@@ -94,7 +94,7 @@ export class UnittestTestDiscoveryAdapter implements ITestDiscoveryAdapter {
             // Execute using environment extension if available
             if (useEnvExtension()) {
                 traceInfo(`Using environment extension for unittest discovery in workspace ${uri.fsPath}`);
-                const pythonEnv = await getEnvironment(uri);
+                const pythonEnv = project?.pythonEnvironment ?? (await getEnvironment(uri));
                 if (!pythonEnv) {
                     traceError(
                         `Python environment not found for workspace ${uri.fsPath}. Cannot proceed with test discovery.`,

src/client/testing/testController/unittest/testExecutionAdapter.ts

@@ -48,18 +48,9 @@ export class UnittestTestExecutionAdapter implements ITestExecutionAdapter {
         runInstance: TestRun,
         executionFactory: IPythonExecutionFactory,
         debugLauncher?: ITestDebugLauncher,
-        interpreter?: PythonEnvironment,
+        _interpreter?: PythonEnvironment,
         project?: ProjectAdapter,
     ): Promise<void> {
-        // Note: project parameter is currently unused for unittest.
-        // Project-based unittest execution will be implemented in a future PR.
-        console.log(
-            'interpreter, project parameters are currently unused in UnittestTestExecutionAdapter, they will be used in a future implementation of project-based unittest execution.:',
-            {
-                interpreter,
-                project,
-            },
-        );
         // deferredTillServerClose awaits named pipe server close
         const deferredTillServerClose: Deferred<void> = utils.createTestingDeferred();
 
@@ -189,6 +180,8 @@ export class UnittestTestExecutionAdapter implements ITestExecutionAdapter {
                     testProvider: UNITTEST_PROVIDER,
                     runTestIdsPort: testIdsFileName,
                     pytestPort: resultNamedPipeName, // change this from pytest
+                    // Pass project for project-based debugging (Python path and session name derived from this)
+                    project: project?.pythonProject,
                 };
                 const sessionOptions: DebugSessionOptions = {
                     testRun: runInstance,
@@ -207,7 +200,7 @@ export class UnittestTestExecutionAdapter implements ITestExecutionAdapter {
                     sessionOptions,
                 );
             } else if (useEnvExtension()) {
-                const pythonEnv = await getEnvironment(uri);
+                const pythonEnv = project?.pythonEnvironment ?? (await getEnvironment(uri));
                 if (pythonEnv) {
                     traceInfo(`Running unittest with arguments: ${args.join(' ')} for workspace ${uri.fsPath} \r\n`);
                     const deferredTillExecClose = createDeferred();

src/test/testing/testController/unittest/testExecutionAdapter.unit.test.ts

@@ -23,6 +23,7 @@ import { traceInfo } from '../../../../client/logging';
 import { UnittestTestExecutionAdapter } from '../../../../client/testing/testController/unittest/testExecutionAdapter';
 import * as extapi from '../../../../client/envExt/api.internal';
 import { ProjectAdapter } from '../../../../client/testing/testController/common/projectAdapter';
+import { createMockProjectAdapter } from '../testMocks';
 
 suite('Unittest test execution adapter', () => {
     let configService: IConfigurationService;
@@ -434,4 +435,147 @@ suite('Unittest test execution adapter', () => {
             typeMoq.Times.once(),
         );
     });
+
+    test('Debug mode with project should pass project.pythonProject to debug launcher', async () => {
+        const deferred3 = createDeferred();
+        utilsWriteTestIdsFileStub.callsFake(() => Promise.resolve('testIdPipe-mockName'));
+
+        debugLauncher
+            .setup((dl) => dl.launchDebugger(typeMoq.It.isAny(), typeMoq.It.isAny(), typeMoq.It.isAny()))
+            .returns(async (_opts, callback) => {
+                traceInfo('stubs launch debugger');
+                if (typeof callback === 'function') {
+                    deferred3.resolve();
+                    callback();
+                }
+            });
+
+        const testRun = typeMoq.Mock.ofType<TestRun>();
+        testRun
+            .setup((t) => t.token)
+            .returns(
+                () =>
+                    ({
+                        onCancellationRequested: () => undefined,
+                    } as any),
+            );
+
+        const projectPath = path.join('/', 'workspace', 'myproject');
+        const mockProject = createMockProjectAdapter({
+            projectPath,
+            projectName: 'myproject (Python 3.11)',
+            pythonPath: '/custom/python/path',
+            testProvider: 'unittest',
+        });
+
+        const uri = Uri.file(myTestPath);
+        adapter = new UnittestTestExecutionAdapter(configService);
+        adapter.runTests(
+            uri,
+            [],
+            TestRunProfileKind.Debug,
+            testRun.object,
+            execFactory.object,
+            debugLauncher.object,
+            undefined,
+            mockProject,
+        );
+
+        await deferred3.promise;
+
+        debugLauncher.verify(
+            (x) =>
+                x.launchDebugger(
+                    typeMoq.It.is<LaunchOptions>((launchOptions) => {
+                        // Project should be passed for project-based debugging
+                        assert.ok(launchOptions.project, 'project should be defined');
+                        assert.equal(launchOptions.project?.name, 'myproject (Python 3.11)');
+                        assert.equal(launchOptions.project?.uri.fsPath, projectPath);
+                        return true;
+                    }),
+                    typeMoq.It.isAny(),
+                    typeMoq.It.isAny(),
+                ),
+            typeMoq.Times.once(),
+        );
+    });
+
+    test('useEnvExtension mode with project should use project pythonEnvironment', async () => {
+        // Enable the useEnvExtension path
+        useEnvExtensionStub.returns(true);
+
+        utilsWriteTestIdsFileStub.callsFake(() => Promise.resolve('testIdPipe-mockName'));
+
+        // Store the deferredTillServerClose so we can resolve it
+        let serverCloseDeferred: Deferred<void> | undefined;
+        utilsStartRunResultNamedPipeStub.callsFake((_callback: unknown, deferred: Deferred<void>, _token: unknown) => {
+            serverCloseDeferred = deferred;
+            return Promise.resolve('runResultPipe-mockName');
+        });
+
+        const projectPath = path.join('/', 'workspace', 'myproject');
+        const mockProject = createMockProjectAdapter({
+            projectPath,
+            projectName: 'myproject (Python 3.11)',
+            pythonPath: '/custom/python/path',
+            testProvider: 'unittest',
+        });
+
+        // Stub runInBackground to capture which environment was used
+        const runInBackgroundStub = sinon.stub(extapi, 'runInBackground');
+        const exitCallbacks: ((code: number, signal: string | null) => void)[] = [];
+        // Promise that resolves when the production code registers its onExit handler
+        const onExitRegistered = createDeferred<void>();
+        const mockProc2 = {
+            stdout: { on: sinon.stub() },
+            stderr: { on: sinon.stub() },
+            onExit: (cb: (code: number, signal: string | null) => void) => {
+                exitCallbacks.push(cb);
+                onExitRegistered.resolve();
+            },
+            kill: sinon.stub(),
+        };
+        runInBackgroundStub.callsFake(() => Promise.resolve(mockProc2 as any));
+
+        const testRun = typeMoq.Mock.ofType<TestRun>();
+        testRun
+            .setup((t) => t.token)
+            .returns(
+                () =>
+                    ({
+                        onCancellationRequested: () => undefined,
+                    } as any),
+            );
+
+        const uri = Uri.file(myTestPath);
+        adapter = new UnittestTestExecutionAdapter(configService);
+        const runPromise = adapter.runTests(
+            uri,
+            [],
+            TestRunProfileKind.Run,
+            testRun.object,
+            execFactory.object,
+            debugLauncher.object,
+            undefined,
+            mockProject,
+        );
+
+        // Wait for production code to register its onExit handler
+        await onExitRegistered.promise;
+
+        // Simulate process exit to complete the test
+        exitCallbacks.forEach((cb) => cb(0, null));
+
+        // Resolve the server close deferred to allow the runTests to complete
+        serverCloseDeferred?.resolve();
+
+        await runPromise;
+
+        // Verify runInBackground was called with the project's Python environment
+        sinon.assert.calledOnce(runInBackgroundStub);
+        const envArg = runInBackgroundStub.firstCall.args[0];
+        // The environment should be the project's pythonEnvironment
+        assert.ok(envArg, 'runInBackground should be called with an environment');
+        assert.equal(envArg.execInfo?.run?.executable, '/custom/python/path');
+    });
 });