add NotebookDocument.save().

extensions/vscode-api-tests/src/singlefolder-tests/notebook.document.test.ts

@@ -293,4 +293,37 @@ suite('Notebook Document', function () {
 			assert.deepStrictEqual(data.cells[0].outputs, [thirdOutput]);
 		}
 	});
+
+	test('document save API', async function () {
+		const uri = await utils.createRandomFile(undefined, undefined, '.nbdtest');
+		const notebook = await vscode.notebook.openNotebookDocument(uri);
+
+		assert.strictEqual(notebook.uri.toString(), uri.toString());
+		assert.strictEqual(notebook.isDirty, false);
+		assert.strictEqual(notebook.isUntitled, false);
+		assert.strictEqual(notebook.cells.length, 1);
+		assert.strictEqual(notebook.viewType, 'notebook.nbdtest');
+
+		const edit = new vscode.WorkspaceEdit();
+		edit.replaceNotebookCells(notebook.uri, 0, 0, [{
+			cellKind: vscode.NotebookCellKind.Markdown,
+			language: 'markdown',
+			metadata: undefined,
+			outputs: [],
+			source: 'new_markdown'
+		}, {
+			cellKind: vscode.NotebookCellKind.Code,
+			language: 'fooLang',
+			metadata: undefined,
+			outputs: [],
+			source: 'new_code'
+		}]);
+
+		const success = await vscode.workspace.applyEdit(edit);
+		assert.strictEqual(success, true);
+		assert.strictEqual(notebook.isDirty, true);
+
+		await notebook.save();
+		assert.strictEqual(notebook.isDirty, false);
+	});
 });