Add basic integration tests for .deepnote file handling (GRN-4766)

- Created minimal .deepnote test fixture with init notebook and main notebook
- Implemented integration tests for:
  - Loading .deepnote files and verifying metadata
  - Kernel startup for .deepnote files
  - Basic code block execution with output validation
  - Multiple code block execution
  - Cell output validation

Tests follow existing patterns from executionService.vscode.test.ts

Co-Authored-By: Filip Pyrek <PyrekFilip@gmail.com>

Author: devin-ai-integration[bot]

src/test/datascience/notebook/deepnote.vscode.test.ts

@@ -0,0 +1,168 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+/* eslint-disable @typescript-eslint/no-require-imports, @typescript-eslint/no-var-requires */
+import { assert } from 'chai';
+import * as path from '../../../platform/vscode-path/path';
+import { Uri, workspace } from 'vscode';
+import { IDisposable } from '../../../platform/common/types';
+import { captureScreenShot, IExtensionTestApi } from '../../common.node';
+import { EXTENSION_ROOT_DIR_FOR_TESTS, initialize } from '../../initialize.node';
+import {
+    closeNotebooksAndCleanUpAfterTests,
+    startJupyterServer,
+    waitForExecutionCompletedSuccessfully,
+    getCellOutputs,
+    getDefaultKernelConnection
+} from './helper.node';
+import { IKernel, IKernelProvider, INotebookKernelExecution } from '../../../kernels/types';
+import { createKernelController, TestNotebookDocument } from './executionHelper';
+import { logger } from '../../../platform/logging';
+import { IDeepnoteNotebookManager } from '../../../notebooks/types';
+
+/* eslint-disable @typescript-eslint/no-explicit-any, no-invalid-this */
+suite('Deepnote Integration Tests @kernelCore', function () {
+    let api: IExtensionTestApi;
+    const disposables: IDisposable[] = [];
+    const deepnoteFilePath = Uri.file(
+        path.join(EXTENSION_ROOT_DIR_FOR_TESTS, 'src', 'test', 'datascience', 'notebook', 'test.deepnote')
+    );
+    this.timeout(120_000);
+    let notebook: TestNotebookDocument;
+    let kernel: IKernel;
+    let kernelExecution: INotebookKernelExecution;
+
+    suiteSetup(async function () {
+        logger.info('Suite Setup VS Code Notebook - Deepnote Integration');
+        this.timeout(120_000);
+        try {
+            api = await initialize();
+            logger.debug('Before starting Jupyter');
+            await startJupyterServer();
+            logger.debug('After starting Jupyter');
+
+            notebook = new TestNotebookDocument(deepnoteFilePath);
+
+            const kernelProvider = api.serviceContainer.get<IKernelProvider>(IKernelProvider);
+            logger.debug('Before creating kernel connection');
+            const metadata = await getDefaultKernelConnection();
+            logger.debug('After creating kernel connection');
+
+            const controller = createKernelController();
+            kernel = kernelProvider.getOrCreate(notebook, { metadata, resourceUri: notebook.uri, controller });
+            logger.debug('Before starting kernel');
+            await kernel.start();
+            logger.debug('After starting kernel');
+            kernelExecution = kernelProvider.getKernelExecution(kernel);
+            logger.info('Suite Setup (completed)');
+        } catch (e) {
+            logger.error('Suite Setup (failed) - Deepnote Integration', e);
+            await captureScreenShot('deepnote-suite');
+            throw e;
+        }
+    });
+
+    setup(function () {
+        notebook.cells.length = 0;
+        logger.info(`Start Test (completed) ${this.currentTest?.title}`);
+    });
+
+    teardown(async function () {
+        if (this.currentTest?.isFailed()) {
+            await captureScreenShot(this);
+        }
+        logger.info(`Ended Test (completed) ${this.currentTest?.title}`);
+    });
+
+    suiteTeardown(() => closeNotebooksAndCleanUpAfterTests(disposables));
+
+    test('Load .deepnote file', async function () {
+        logger.debug('Test: Load .deepnote file - starting');
+
+        const notebookManager = api.serviceContainer.get<IDeepnoteNotebookManager>(IDeepnoteNotebookManager);
+
+        notebookManager.selectNotebookForProject('test-project-id', 'main-notebook-id');
+
+        const nbDocument = await workspace.openNotebookDocument(deepnoteFilePath);
+
+        logger.debug(`Opened notebook with type: ${nbDocument.notebookType}, cells: ${nbDocument.cellCount}`);
+
+        assert.equal(nbDocument.notebookType, 'deepnote', 'Notebook type should be deepnote');
+        assert.isTrue(nbDocument.cellCount > 0, 'Notebook should have cells');
+
+        assert.equal(nbDocument.metadata?.deepnoteProjectId, 'test-project-id', 'Project ID should match');
+        assert.equal(nbDocument.metadata?.deepnoteNotebookId, 'main-notebook-id', 'Notebook ID should match');
+
+        logger.debug('Test: Load .deepnote file - completed');
+    });
+
+    test('Kernel starts for .deepnote file', async function () {
+        logger.debug('Test: Kernel starts for .deepnote file - starting');
+
+        assert.isOk(kernel, 'Kernel should exist');
+        assert.isOk(kernel.session, 'Kernel session should exist');
+
+        logger.debug('Test: Kernel starts for .deepnote file - completed');
+    });
+
+    test('Execute code block', async function () {
+        logger.debug('Test: Execute code block - starting');
+
+        const cell = await notebook.appendCodeCell('print("Hello World")');
+
+        await Promise.all([kernelExecution.executeCell(cell), waitForExecutionCompletedSuccessfully(cell)]);
+
+        assert.isAtLeast(cell.executionSummary?.executionOrder || 0, 1, 'Cell should have execution order');
+        assert.isTrue(cell.executionSummary?.success, 'Cell execution should succeed');
+        assert.isAtLeast(cell.outputs.length, 1, 'Cell should have output');
+
+        const output = getCellOutputs(cell);
+        assert.include(output, 'Hello World', 'Output should contain "Hello World"');
+
+        logger.debug('Test: Execute code block - completed');
+    });
+
+    test('Execute multiple code blocks', async function () {
+        logger.debug('Test: Execute multiple code blocks - starting');
+
+        const cell1 = await notebook.appendCodeCell('x = 42');
+        const cell2 = await notebook.appendCodeCell('print(f"The answer is {x}")');
+
+        await Promise.all([
+            kernelExecution.executeCell(cell1),
+            waitForExecutionCompletedSuccessfully(cell1),
+            kernelExecution.executeCell(cell2),
+            waitForExecutionCompletedSuccessfully(cell2)
+        ]);
+
+        assert.isAtLeast(cell1.executionSummary?.executionOrder || 0, 1, 'First cell should have execution order');
+        assert.isTrue(cell1.executionSummary?.success, 'First cell execution should succeed');
+
+        assert.isAtLeast(cell2.executionSummary?.executionOrder || 0, 1, 'Second cell should have execution order');
+        assert.isTrue(cell2.executionSummary?.success, 'Second cell execution should succeed');
+        assert.isAtLeast(cell2.outputs.length, 1, 'Second cell should have output');
+
+        const output = getCellOutputs(cell2);
+        assert.include(output, 'The answer is 42', 'Output should contain "The answer is 42"');
+
+        logger.debug('Test: Execute multiple code blocks - completed');
+    });
+
+    test('Verify cell output validation', async function () {
+        logger.debug('Test: Verify cell output validation - starting');
+
+        const cell = await notebook.appendCodeCell('for i in range(3):\n    print(f"Line {i}")');
+
+        await Promise.all([kernelExecution.executeCell(cell), waitForExecutionCompletedSuccessfully(cell)]);
+
+        assert.isTrue(cell.executionSummary?.success, 'Cell execution should succeed');
+        assert.isAtLeast(cell.outputs.length, 1, 'Cell should have output');
+
+        const output = getCellOutputs(cell);
+        assert.include(output, 'Line 0', 'Output should contain "Line 0"');
+        assert.include(output, 'Line 1', 'Output should contain "Line 1"');
+        assert.include(output, 'Line 2', 'Output should contain "Line 2"');
+
+        logger.debug('Test: Verify cell output validation - completed');
+    });
+});

src/test/datascience/notebook/test.deepnote

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+metadata:
+  createdAt: '2025-01-01T00:00:00.000Z'
+  modifiedAt: '2025-01-01T00:00:00.000Z'
+project:
+  id: test-project-id
+  name: Test Project
+  initNotebookId: init-notebook-id
+  notebooks:
+    - id: init-notebook-id
+      name: Init Notebook
+      blocks:
+        - id: init-block-1
+          type: code
+          content: |
+            # This is the init notebook
+            import sys
+            print("Init notebook executed")
+          sortingKey: '0001'
+    - id: main-notebook-id
+      name: Main Notebook
+      blocks:
+        - id: block-1
+          type: code
+          content: |
+            print("Hello World")
+          sortingKey: '0001'
+        - id: block-2
+          type: code
+          content: |
+            x = 42
+            print(f"The answer is {x}")
+          sortingKey: '0002'
+        - id: block-3
+          type: markdown
+          content: |
+            # Test Markdown
+            This is a test markdown block.
+          sortingKey: '0003'
+version: '1.0'