extension/src/goTest: disable when exp-vscode-go is installed

Adds 'experimental features' to preview versions. The first experimental
feature: when exp-vscode-go is installed, disable goTest (the test
explorer implementation). Adds a setting to disable this behavior
Notifies the user the first time goTest is disabled for this reason.

Modifies goTest to support being unloaded or reloaded based on
configuration changes.

Change-Id: I7a4b2188b5038f9f6b5841ed47a5b27307e24ef1
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/613695
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>
kokoro-CI: kokoro <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Hongxiang Jiang <[email protected]>
Auto-Submit: Hyang-Ah Hana Kim <[email protected]>

CHANGELOG.md

@@ -19,6 +19,10 @@ to use the go1.21 or newer when installing tools. ([Issue 3411](https://github.c
 * Extension build target is set to `es2022`. ([Issue 3540](https://github.com/golang/vscode-go/issues/3540))
 * The extension release workflow is migrated to the Go project's [Relui](https://pkg.go.dev/golang.org/x/build/cmd/relui#section-readme). ([Issue 3500](https://github.com/golang/vscode-go/issues/3500))
 
+### Testing
+
+A new extension, [Go Companion](https://marketplace.visualstudio.com/items?itemName=ethan-reesor.exp-vscode-go), has been released with experimental support for gopls-based test discovery. If Go Companion is installed, pre-release versions of this extension will automatically disable its test explorer in favor of Go Companion's implementation. See [experiments](./docs/experiments.md#test-explorer) for details on Go Companion's features and for disabling the automatic switchover.
+
 ## v0.42.1
 
 Date: 9 Sep, 2024

docs/experiments.md

@@ -0,0 +1,31 @@
+# Experiments
+
+Pre-release versions of [vscode-go][vscode-go] include experimental features.
+These features may be individually enabled or disabled via the setting
+`go.experiments`.
+
+[vscode-go]: https://github.com/golang/vscode-go/blob/master/README.md#pre-release-versions
+
+## Test explorer
+
+[Go Companion][exp-vscode-go] includes an experimental test explorer
+implementation based on `gopls`'s test discovery. This requires gopls v0.17.0 or
+newer. If Go Companion is present and vscode-go is a pre-release version,
+vscode-go will prefer Go Companion's test explorer, disabling its own, unless
+the experiment is set to `off`. The experimental test explorer provides more
+robust test discovery by using gopls, including static discovery of _some_
+subtests. It also implements:
+
+- Ignore tests within files excluded by `files.exclude` or
+  `goExp.testExplorer.exclude`.
+- Disable automatic discovery of tests by setting `goExp.testExplorer.discovery`
+  to "off".
+- Control how tests are displayed with `goExp.testExplorer.showFiles`,
+  `goExp.testExplorer.nestPackages`, and `goExp.testExplorer.nestSubtests`.
+- Debugging a test updates its status in the test explorer.
+- Support for continuous runs.
+- Support for code coverage.
+- Code lenses (hidden by default) that are integrated with the test explorer.
+- Integrated viewer for pprof profiles.
+
+[exp-vscode-go]: https://marketplace.visualstudio.com/items?itemName=ethan-reesor.exp-vscode-go

docs/settings.md

@@ -218,6 +218,19 @@ Default:
 	"runtest" :	true,
 }
 ```
+### `go.experiments`
+
+Disable experimental features. These features are only available in the pre-release version.
+| Properties | Description |
+| --- | --- |
+| `testExplorer` | Prefer the experimental test explorer <br/> Default: `true` |
+
+Default:
+```
+{
+	"testExplorer" :	true,
+}
+```
 ### `go.formatFlags`
 
 Flags to pass to format tool (e.g. ["-s"]). Not applicable when using the language server.

extension/package.json

@@ -1477,6 +1477,20 @@
           "description": "Open the test output terminal when a test run is started.",
           "scope": "window"
         },
+        "go.experiments": {
+          "type": "object",
+          "default": {
+            "testExplorer": true
+          },
+          "description": "Disable experimental features. These features are only available in the pre-release version.",
+          "properties": {
+            "testExplorer": {
+              "type": "boolean",
+              "default": true,
+              "description": "Prefer the experimental test explorer"
+            }
+          }
+        },
         "go.generateTestsFlags": {
           "type": "array",
           "items": {

extension/src/experimental.ts

@@ -0,0 +1,77 @@
+/*---------------------------------------------------------
+ * Copyright 2024 The Go Authors. All rights reserved.
+ * Licensed under the MIT License. See LICENSE in the project root for license information.
+ *--------------------------------------------------------*/
+
+import { EventEmitter, ExtensionContext, ExtensionMode, extensions, workspace } from 'vscode';
+import { extensionInfo } from './config';
+
+type Settings = {
+	testExplorer: boolean;
+};
+
+class Experiments {
+	#didChange = new EventEmitter<Experiments>();
+
+	// Default to disabled
+	#testExplorer = false;
+
+	activate(ctx: ExtensionContext) {
+		// Cleanup the event emitter when the extension is unloaded
+		ctx.subscriptions.push(this.#didChange);
+
+		// Don't enable any experiments in a production release
+		if (ctx.extensionMode === ExtensionMode.Production && !extensionInfo.isPreview) {
+			return;
+		}
+
+		// Check on boot
+		this.#maybeEnableExperiments();
+
+		// Check when an extension is installed or uninstalled
+		ctx.subscriptions.push(extensions.onDidChange(() => this.#maybeEnableExperiments()));
+
+		// Check when the configuration changes
+		ctx.subscriptions.push(
+			workspace.onDidChangeConfiguration((e) => {
+				if (e.affectsConfiguration('go.experiments')) {
+					this.#maybeEnableExperiments();
+				}
+			})
+		);
+	}
+
+	/**
+	 * Checks whether experiments should be enabled or disabled. If the
+	 * enable/disable state of an experiment changes, an {@link onDidChange}
+	 * event is issued.
+	 */
+	#maybeEnableExperiments() {
+		const settings = workspace.getConfiguration('go').get<Settings>('experiments');
+
+		// Check if the test explorer experiment should be activated
+		const goExp = extensions.getExtension('ethan-reesor.exp-vscode-go');
+		const testExplorer = settings?.testExplorer !== false && !!goExp;
+		if (testExplorer !== this.#testExplorer) {
+			this.#testExplorer = testExplorer;
+			this.#didChange.fire(this);
+		}
+	}
+
+	/**
+	 * onDidChange issues an event whenever the enable/disable status of an
+	 * experiment changes. This can happen due to configuration changes or
+	 * companion extensions being loaded or unloaded.
+	 */
+	readonly onDidChange = this.#didChange.event;
+
+	/**
+	 * If true, this extension's test explorer is disabled in favor of Go
+	 * Companion's test explorer.
+	 */
+	get testExplorer() {
+		return this.#testExplorer;
+	}
+}
+
+export const experiments = new Experiments();

extension/src/goMain.ts

@@ -65,14 +65,15 @@ import { getFormatTool } from './language/legacy/goFormat';
 import { resetSurveyConfigs, showSurveyConfig } from './goSurvey';
 import { ExtensionAPI } from './export';
 import extensionAPI from './extensionAPI';
-import { GoTestExplorer, isVscodeTestingAPIAvailable } from './goTest/explore';
+import { GoTestExplorer } from './goTest/explore';
 import { killRunningPprof } from './goTest/profile';
 import { GoExplorerProvider } from './goExplorer';
 import { GoExtensionContext } from './context';
 import * as commands from './commands';
 import { toggleVulncheckCommandFactory } from './goVulncheck';
 import { GoTaskProvider } from './goTaskProvider';
 import { setTelemetryEnvVars, telemetryReporter } from './goTelemetry';
+import { experiments } from './experimental';
 
 const goCtx: GoExtensionContext = {};
 
@@ -147,6 +148,9 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<ExtensionA
 	GoRunTestCodeLensProvider.activate(ctx, goCtx);
 	GoDebugConfigurationProvider.activate(ctx, goCtx);
 	GoDebugFactory.activate(ctx, goCtx);
+	experiments.activate(ctx);
+	GoTestExplorer.setup(ctx, goCtx);
+	GoExplorerProvider.setup(ctx);
 
 	goCtx.buildDiagnosticCollection = vscode.languages.createDiagnosticCollection('go');
 	ctx.subscriptions.push(goCtx.buildDiagnosticCollection);
@@ -185,12 +189,6 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<ExtensionA
 	registerCommand('go.tools.install', commands.installTools);
 	registerCommand('go.browse.packages', browsePackages);
 
-	if (isVscodeTestingAPIAvailable && cfg.get<boolean>('testExplorer.enable')) {
-		GoTestExplorer.setup(ctx, goCtx);
-	}
-
-	GoExplorerProvider.setup(ctx);
-
 	registerCommand('go.test.generate.package', goGenerateTests.generateTestCurrentPackage);
 	registerCommand('go.test.generate.file', goGenerateTests.generateTestCurrentFile);
 	registerCommand('go.test.generate.function', goGenerateTests.generateTestCurrentFunction);
@@ -332,15 +330,6 @@ function addOnDidChangeConfigListeners(ctx: vscode.ExtensionContext) {
 					// TODO: actively maintain our own disposables instead of keeping pushing to ctx.subscription.
 				}
 			}
-			if (e.affectsConfiguration('go.testExplorer.enable')) {
-				const msg =
-					'Go test explorer has been enabled or disabled. For this change to take effect, the window must be reloaded.';
-				vscode.window.showInformationMessage(msg, 'Reload').then((selected) => {
-					if (selected === 'Reload') {
-						vscode.commands.executeCommand('workbench.action.reloadWindow');
-					}
-				});
-			}
 		})
 	);
 }