add tests for Documentation Live Preview

assets/test/documentation-live-preview/Package.swift

@@ -0,0 +1,20 @@
+// swift-tools-version: 6.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "documentation-live-preview",
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "Library",
+            targets: ["Library"]),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "Library"),
+    ]
+)

assets/test/documentation-live-preview/Sources/Library/Library.docc/GettingStarted.md

@@ -0,0 +1,3 @@
+# Getting Started
+
+This is the getting started page.

assets/test/documentation-live-preview/Sources/Library/Library.docc/Tutorial.tutorial

@@ -0,0 +1,5 @@
+@Tutorial(time: 30) {
+    @Intro(title: "Library") {
+        Library Tutorial
+    }
+}

assets/test/documentation-live-preview/Sources/Library/Library.docc/TutorialOverview.tutorial

@@ -0,0 +1,5 @@
+@Tutorials(name: "SlothCreator") {
+    @Intro(title: "Meet Library") {
+        Library Tutorial Overview
+    }
+}

assets/test/documentation-live-preview/Sources/Library/Library.swift

@@ -0,0 +1,16 @@
+// The Swift Programming Language
+// https://docs.swift.org/swift-book
+
+/// The entry point for this arbitrary library.
+///
+/// Used for testing the Documentation Live Preview.
+public struct EntryPoint {
+    /// The name of this EntryPoint
+    public let name: String
+
+    /// Creates a new EntryPoint
+    /// - Parameter name: the name of this entry point
+    public init(name: String) {
+        self.name = name
+    }
+}

assets/test/documentation-live-preview/UnsupportedFile.txt

@@ -0,0 +1 @@
+Used to test Live Preview with an unsupported file.

src/documentation/DocumentationPreviewEditor.ts

@@ -98,6 +98,7 @@ export class DocumentationPreviewEditor implements vscode.Disposable {
     private activeTextEditor?: vscode.TextEditor;
     private activeTextEditorSelection?: vscode.Selection;
     private subscriptions: vscode.Disposable[] = [];
+    private isDisposed: boolean = false;
 
     private disposeEmitter = new vscode.EventEmitter<void>();
     private renderEmitter = new vscode.EventEmitter<void>();
@@ -133,13 +134,17 @@ export class DocumentationPreviewEditor implements vscode.Disposable {
     }
 
     dispose() {
+        this.isDisposed = true;
         this.subscriptions.forEach(subscription => subscription.dispose());
         this.subscriptions = [];
         this.webviewPanel.dispose();
         this.disposeEmitter.fire();
     }
 
     private postMessage(message: WebviewMessage) {
+        if (this.isDisposed) {
+            return;
+        }
         if (message.type === "update-content") {
             this.updateContentEmitter.fire(message.content);
         }

test/integration-tests/documentation/DocumentationLivePreview.test.ts

@@ -0,0 +1,225 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the VS Code Swift open source project
+//
+// Copyright (c) 2024 the VS Code Swift project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of VS Code Swift project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import * as vscode from "vscode";
+import * as path from "path";
+import contextKeys from "../../../src/contextKeys";
+import { expect } from "chai";
+import { activateExtensionForSuite, folderInRootWorkspace } from "../utilities/testutilities";
+import { waitForNoRunningTasks } from "../../utilities/tasks";
+import { testAssetUri } from "../../fixtures";
+import { FolderContext } from "../../../src/FolderContext";
+import { WorkspaceContext } from "../../../src/WorkspaceContext";
+import { Commands } from "../../../src/commands";
+import { Workbench } from "../../../src/utilities/commands";
+import {
+    RenderNodeContent,
+    WebviewContent,
+} from "../../../src/documentation/webview/WebviewMessage";
+import { PreviewEditorConstant } from "../../../src/documentation/DocumentationPreviewEditor";
+
+suite("Documentation Live Preview", function () {
+    // Tests are short, but rely on SourceKit-LSP: give 30 seconds for each one
+    this.timeout(30 * 1000);
+
+    let folderContext: FolderContext;
+    let workspaceContext: WorkspaceContext;
+
+    activateExtensionForSuite({
+        async setup(ctx) {
+            workspaceContext = ctx;
+            await waitForNoRunningTasks();
+            folderContext = await folderInRootWorkspace("documentation-live-preview", ctx);
+            await ctx.focusFolder(folderContext);
+        },
+    });
+
+    setup(function () {
+        if (!contextKeys.supportsDocumentationLivePreview) {
+            this.skip();
+        }
+    });
+
+    teardown(async function () {
+        await vscode.commands.executeCommand(Workbench.ACTION_CLOSEALLEDITORS);
+    });
+
+    test("renders documentation for an opened Swift file", async function () {
+        const { webviewContent } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.swift",
+            position: new vscode.Position(0, 0),
+        });
+        expect(renderNodeString(webviewContent)).to.include(
+            "The entry point for this arbitrary library."
+        );
+    });
+
+    test("renders documentation when moving the cursor within an opened Swift file", async function () {
+        const { textEditor } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.swift",
+            position: new vscode.Position(0, 0),
+        });
+        // Move the cursor to the comment above EntryPoint.name
+        let webviewContent = await moveCursor(workspaceContext, {
+            textEditor,
+            position: new vscode.Position(7, 12),
+        });
+        expect(renderNodeString(webviewContent)).to.include("The name of this EntryPoint");
+        // Move the cursor to the comment above EntryPoint.init(name:)
+        webviewContent = await moveCursor(workspaceContext, {
+            textEditor,
+            position: new vscode.Position(10, 18),
+        });
+        expect(renderNodeString(webviewContent)).to.include("Creates a new EntryPoint");
+    });
+
+    test("renders documentation when editing an opened Swift file", async function () {
+        const { textEditor } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.swift",
+            position: new vscode.Position(0, 0),
+        });
+        // Edit the comment above EntryPoint
+        const webviewContent = await editDocument(workspaceContext, textEditor, editBuilder => {
+            editBuilder.replace(new vscode.Selection(3, 29, 3, 38), "absolutely amazing");
+        });
+        expect(renderNodeString(webviewContent)).to.include(
+            "The entry point for this absolutely amazing library."
+        );
+    });
+
+    test("renders documentation for an opened Markdown article", async function () {
+        const { webviewContent } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.docc/GettingStarted.md",
+            position: new vscode.Position(0, 0),
+        });
+        expect(renderNodeString(webviewContent)).to.include("This is the getting started page.");
+    });
+
+    test("renders documentation for an opened tutorial overview", async function () {
+        const { webviewContent } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.docc/TutorialOverview.tutorial",
+            position: new vscode.Position(0, 0),
+        });
+        expect(renderNodeString(webviewContent)).to.include("Library Tutorial Overview");
+    });
+
+    test("renders documentation for an opened tutorial", async function () {
+        const { webviewContent } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "Sources/Library/Library.docc/Tutorial.tutorial",
+            position: new vscode.Position(0, 0),
+        });
+        expect(renderNodeString(webviewContent)).to.include("Library Tutorial");
+    });
+
+    test("displays an error for an unsupported active document", async function () {
+        const { webviewContent } = await launchLivePreviewEditor(workspaceContext, {
+            filePath: "UnsupportedFile.txt",
+            position: new vscode.Position(0, 0),
+        });
+        expect(webviewContent).to.have.property("type").that.equals("error");
+        expect(webviewContent)
+            .to.have.property("errorMessage")
+            .that.equals(PreviewEditorConstant.UNSUPPORTED_EDITOR_ERROR_MESSAGE);
+    });
+});
+
+async function launchLivePreviewEditor(
+    workspaceContext: WorkspaceContext,
+    options: {
+        filePath: string;
+        position: vscode.Position;
+    }
+): Promise<{ textEditor: vscode.TextEditor; webviewContent: WebviewContent }> {
+    if (findTab(PreviewEditorConstant.VIEW_TYPE, PreviewEditorConstant.TITLE)) {
+        throw new Error("The live preview editor cannot be launched twice in a single test");
+    }
+    const contentUpdatePromise = waitForNextContentUpdate(workspaceContext);
+    const renderedPromise = waitForNextRender(workspaceContext);
+    // Open up the test file before launching live preview
+    const fileUri = testAssetUri(path.join("documentation-live-preview", options.filePath));
+    const selection = new vscode.Selection(options.position, options.position);
+    const textEditor = await vscode.window.showTextDocument(fileUri, { selection: selection });
+    // Launch the documentation preview and wait for it to render
+    expect(await vscode.commands.executeCommand(Commands.PREVIEW_DOCUMENTATION)).to.be.true;
+    const [webviewContent] = await Promise.all([contentUpdatePromise, renderedPromise]);
+    return { textEditor, webviewContent };
+}
+
+async function editDocument(
+    workspaceContext: WorkspaceContext,
+    textEditor: vscode.TextEditor,
+    callback: (editBuilder: vscode.TextEditorEdit) => void
+): Promise<WebviewContent> {
+    const contentUpdatePromise = waitForNextContentUpdate(workspaceContext);
+    const renderedPromise = waitForNextRender(workspaceContext);
+    await expect(textEditor.edit(callback)).to.eventually.be.true;
+    const [webviewContent] = await Promise.all([contentUpdatePromise, renderedPromise]);
+    return webviewContent;
+}
+
+async function moveCursor(
+    workspaceContext: WorkspaceContext,
+    options: {
+        textEditor: vscode.TextEditor;
+        position: vscode.Position;
+    }
+): Promise<WebviewContent> {
+    const contentUpdatePromise = waitForNextContentUpdate(workspaceContext);
+    const renderedPromise = waitForNextRender(workspaceContext);
+    options.textEditor.selection = new vscode.Selection(options.position, options.position);
+    const [webviewContent] = await Promise.all([contentUpdatePromise, renderedPromise]);
+    return webviewContent;
+}
+
+function renderNodeString(webviewContent: WebviewContent): string {
+    expect(webviewContent).to.have.property("type").that.equals("render-node");
+    return JSON.stringify((webviewContent as RenderNodeContent).renderNode);
+}
+
+function waitForNextContentUpdate(context: WorkspaceContext): Promise<WebviewContent> {
+    return new Promise<WebviewContent>(resolve => {
+        const disposable = context.documentation.onPreviewDidUpdateContent(
+            (content: WebviewContent) => {
+                resolve(content);
+                disposable.dispose();
+            }
+        );
+    });
+}
+
+function waitForNextRender(context: WorkspaceContext): Promise<boolean> {
+    return new Promise<boolean>(resolve => {
+        const disposable = context.documentation.onPreviewDidRenderContent(() => {
+            resolve(true);
+            disposable.dispose();
+        });
+    });
+}
+
+function findTab(viewType: string, title: string): vscode.Tab | undefined {
+    for (const group of vscode.window.tabGroups.all) {
+        for (const tab of group.tabs) {
+            // Check if the tab is of type TabInputWebview and matches the viewType and title
+            if (
+                tab.input instanceof vscode.TabInputWebview &&
+                tab.input.viewType.includes(viewType) &&
+                tab.label === title
+            ) {
+                // We are not checking if tab is active, so return true as long as the if clause is true
+                return tab;
+            }
+        }
+    }
+    return undefined;
+}