Rework the loading of GNATtest tests into VS Code

* Make test loading lazy for efficiency on large test bases
* Listen to changes of gnattest.xml and refresh the test tree

Author: eliericha

integration/vscode/ada/src/ExtensionState.ts

@@ -8,6 +8,7 @@ import { initializeTesting } from './gnattest';
 import { GprTaskProvider } from './gprTaskProvider';
 import { TERMINAL_ENV_SETTING_NAME } from './helpers';
 import { registerTaskProviders } from './taskProviders';
+import { initializeTesting } from './gnattest';
 
 /**
  * This class encapsulates all state that should be maintained throughout the
@@ -32,6 +33,8 @@ export class ExtensionState {
     private registeredTaskProviders: Disposable[];
 
     public readonly codelensProvider = new AdaCodeLensProvider();
+    public readonly testController: vscode.TestController;
+    public readonly testData: Map<vscode.TestItem, object> = new Map();
 
     /**
      * The following fields are caches for ALS requests
@@ -68,6 +71,7 @@ export class ExtensionState {
         const result = initializeDebugging(this.context);
         this.initialDebugConfigProvider = result.providerInitial;
         this.dynamicDebugConfigProvider = result.providerDynamic;
+        this.testController = initializeTesting(context);
     }
 
     public start = async () => {

integration/vscode/ada/src/extension.ts

@@ -26,7 +26,6 @@ import { ExtensionState } from './ExtensionState';
 import { ALSClientFeatures } from './alsClientFeatures';
 import { alsCommandExecutor } from './alsExecuteCommand';
 import { registerCommands } from './commands';
-import { initializeTestView } from './gnattest';
 import {
     TERMINAL_ENV_SETTING_NAME,
     assertSupportedEnvironments,
@@ -161,8 +160,6 @@ async function activateExtension(context: vscode.ExtensionContext) {
 
     await vscode.commands.executeCommand('setContext', ADA_CONTEXT, true);
 
-    await initializeTestView(context, adaExtState);
-
     /**
      * This can display a dialog to the User so don't wait on the result.
      */