diff --git a/package-lock.json b/package-lock.json
index ddda5fd9b6..40622d80e2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -49,7 +49,7 @@
         "yarn": "^1.22.4"
       },
       "engines": {
-        "vscode": "^1.59.0"
+        "vscode": "^1.58.0"
       }
     },
     "node_modules/@babel/code-frame": {
diff --git a/package.json b/package.json
index ca8de271bb..8437377105 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,7 @@
     "yarn": "^1.22.4"
   },
   "engines": {
-    "vscode": "^1.59.0"
+    "vscode": "^1.58.0"
   },
   "activationEvents": [
     "workspaceContains:**/*.go",
@@ -1290,7 +1290,10 @@
         },
         "go.testExplorerPackages": {
           "type": "string",
-          "enum": ["flat", "nested"],
+          "enum": [
+            "flat",
+            "nested"
+          ],
           "default": "flat",
           "description": "Control whether packages are presented flat or nested",
           "scope": "resource"
diff --git a/src/goMain.ts b/src/goMain.ts
index 351d625cf0..5f7d26d46f 100644
--- a/src/goMain.ts
+++ b/src/goMain.ts
@@ -114,7 +114,7 @@ import { getFormatTool } from './goFormat';
 import { resetSurveyConfig, showSurveyConfig, timeMinute } from './goSurvey';
 import { ExtensionAPI } from './export';
 import extensionAPI from './extensionAPI';
-import { TestExplorer } from './goTestExplorer';
+import { isVscodeTestingAPIAvailable, TestExplorer } from './goTestExplorer';
 
 export let buildDiagnosticCollection: vscode.DiagnosticCollection;
 export let lintDiagnosticCollection: vscode.DiagnosticCollection;
@@ -336,13 +336,15 @@ If you would like additional configuration for diagnostics from gopls, please se
 		})
 	);
 
-	const testExplorer = TestExplorer.setup(ctx);
+	if (isVscodeTestingAPIAvailable) {
+		const testExplorer = TestExplorer.setup(ctx);
 
-	ctx.subscriptions.push(
-		vscode.commands.registerCommand('go.test.refresh', (args) => {
-			if (args) testExplorer.resolve(args);
-		})
-	);
+		ctx.subscriptions.push(
+			vscode.commands.registerCommand('go.test.refresh', (args) => {
+				if (args) testExplorer.resolve(args);
+			})
+		);
+	}
 
 	ctx.subscriptions.push(
 		vscode.commands.registerCommand('go.subtest.cursor', (args) => {
diff --git a/src/goTestExplorer.ts b/src/goTestExplorer.ts
index b18fc7d205..89ed23b0c0 100644
--- a/src/goTestExplorer.ts
+++ b/src/goTestExplorer.ts
@@ -36,6 +36,15 @@ import { getGoConfig } from './config';
 import { getTestFlags, goTest, GoTestOutput } from './testUtils';
 import { outputChannel } from './goStatus';
 
+// Set true only if the vscode is the recent version that has the workspace trust API AND
+// if the security.workspace.trust is enabled. Change of this configuration requires restart
+// of VSCode, so we don't need to set up the configuration change listener.
+// TODO(hyangah): remove this and Configuration & WrappedConfiguration when we update
+// our extension to require 2021 June VSCode engine.
+export const isVscodeTestingAPIAvailable =
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	'object' === typeof (vscode as any).tests && 'function' === typeof vscode.tests.createTestController;
+
 // eslint-disable-next-line @typescript-eslint/no-namespace
 export namespace TestExplorer {
 	// exported for tests
@@ -86,6 +95,8 @@ async function doSafe<T>(context: string, p: Thenable<T> | (() => T | Thenable<T
 
 export class TestExplorer {
 	static setup(context: ExtensionContext): TestExplorer {
+		if (!isVscodeTestingAPIAvailable) throw new Error('VSCode Testing API is unavailable');
+
 		const ctrl = vscode.tests.createTestController('go', 'Go');
 		const getSym = new GoDocumentSymbolProvider().provideDocumentSymbols;
 		const inst = new this(ctrl, workspace, getSym);