fix: Add config and capability for test explorer

crates/rust-analyzer/src/config.rs

@@ -1146,6 +1146,10 @@ impl Config {
         self.experimental("colorDiagnosticOutput")
     }
 
+    pub fn test_explorer(&self) -> bool {
+        self.experimental("testExplorer")
+    }
+
     pub fn publish_diagnostics(&self) -> bool {
         self.data.diagnostics_enable
     }

crates/rust-analyzer/src/main_loop.rs

@@ -386,10 +386,11 @@ impl GlobalState {
                 }
             }
 
-            let update_diagnostics = (!was_quiescent || state_changed || memdocs_added_or_removed)
-                && self.config.publish_diagnostics();
-            if update_diagnostics {
+            let things_changed = !was_quiescent || state_changed || memdocs_added_or_removed;
+            if things_changed && self.config.publish_diagnostics() {
                 self.update_diagnostics();
+            }
+            if things_changed && self.config.test_explorer() {
                 self.update_tests();
             }
         }

docs/dev/lsp-extensions.md

@@ -387,6 +387,11 @@ rust-analyzer supports only one `kind`, `"cargo"`. The `args` for `"cargo"` look
 
 ## Test explorer
 
+**Experimental Client Capability:** `{ "testExplorer": boolean }`
+
+If this capability is set, the `experimental/discoveredTests` notification will be sent from the
+server to the client.
+
 **Method:** `experimental/discoverTest`
 
 **Request:** `DiscoverTestParams`

editors/code/package.json

@@ -510,6 +510,11 @@
                     "default": true,
                     "type": "boolean"
                 },
+                "rust-analyzer.testExplorer": {
+                    "markdownDescription": "Whether to show the test explorer.",
+                    "default": false,
+                    "type": "boolean"
+                },
                 "$generated-start": {},
                 "rust-analyzer.assist.emitMustUse": {
                     "markdownDescription": "Whether to insert #[must_use] when generating `as_` methods\nfor enum variants.",

editors/code/src/client.ts

@@ -372,13 +372,18 @@ export async function createClient(
     );
 
     // To turn on all proposed features use: client.registerProposedFeatures();
-    client.registerFeature(new ExperimentalFeatures());
+    client.registerFeature(new ExperimentalFeatures(config));
     client.registerFeature(new OverrideFeatures());
 
     return client;
 }
 
 class ExperimentalFeatures implements lc.StaticFeature {
+    private readonly testExplorer: boolean;
+
+    constructor(config: Config) {
+        this.testExplorer = config.testExplorer || false;
+    }
     getState(): lc.FeatureState {
         return { kind: "static" };
     }
@@ -391,6 +396,7 @@ class ExperimentalFeatures implements lc.StaticFeature {
             colorDiagnosticOutput: true,
             openServerLogs: true,
             localDocs: true,
+            testExplorer: this.testExplorer,
             commands: {
                 commands: [
                     "rust-analyzer.runSingle",

editors/code/src/config.ts

@@ -266,6 +266,10 @@ export class Config {
         return this.get<string | undefined>("cargoRunner");
     }
 
+    get testExplorer() {
+        return this.get<boolean | undefined>("testExplorer");
+    }
+
     get runnablesExtraEnv() {
         const item = this.get<any>("runnables.extraEnv") ?? this.get<any>("runnableEnv");
         if (!item) return item;

editors/code/src/ctx.ts

@@ -75,7 +75,7 @@ export class Ctx implements RustAnalyzerExtensionApi {
     private _client: lc.LanguageClient | undefined;
     private _serverPath: string | undefined;
     private traceOutputChannel: vscode.OutputChannel | undefined;
-    private testController: vscode.TestController;
+    private testController: vscode.TestController | undefined;
     private outputChannel: vscode.OutputChannel | undefined;
     private clientSubscriptions: Disposable[];
     private state: PersistentState;
@@ -104,18 +104,20 @@ export class Ctx implements RustAnalyzerExtensionApi {
         workspace: Workspace,
     ) {
         extCtx.subscriptions.push(this);
+        this.config = new Config(extCtx);
         this.statusBar = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left);
-        this.testController = vscode.tests.createTestController(
-            "rustAnalyzerTestController",
-            "Rust Analyzer test controller",
-        );
+        if (this.config.testExplorer) {
+            this.testController = vscode.tests.createTestController(
+                "rustAnalyzerTestController",
+                "Rust Analyzer test controller",
+            );
+        }
         this.workspace = workspace;
         this.clientSubscriptions = [];
         this.commandDisposables = [];
         this.commandFactories = commandFactories;
         this.unlinkedFiles = [];
         this.state = new PersistentState(extCtx.globalState);
-        this.config = new Config(extCtx);
 
         this.updateCommands("disable");
         this.setServerStatus({
@@ -126,7 +128,7 @@ export class Ctx implements RustAnalyzerExtensionApi {
     dispose() {
         this.config.dispose();
         this.statusBar.dispose();
-        this.testController.dispose();
+        this.testController?.dispose();
         void this.disposeClient();
         this.commandDisposables.forEach((disposable) => disposable.dispose());
     }
@@ -271,7 +273,9 @@ export class Ctx implements RustAnalyzerExtensionApi {
         await client.start();
         this.updateCommands();
 
-        prepareTestExplorer(this, this.testController, client);
+        if (this.testController) {
+            prepareTestExplorer(this, this.testController, client);
+        }
         if (this.config.showDependenciesExplorer) {
             this.prepareTreeDependenciesView(client);
         }