diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 4ef65fa146e42bfe2269b601755d9d11d6f9520b..edd273928b202c242131417092ce20c8b1c6101b 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -14102,7 +14102,7 @@ declare module 'vscode' {
 		 * Associated tag for the profile. If this is set, only {@link TestItem}
 		 * instances with the same tag will be eligible to execute in this profile.
 		 */
-		tag?: TestTag;
+		tag: TestTag | undefined;
 
 		/**
 		 * If this method is present, a configuration gear will be present in the
@@ -14110,7 +14110,7 @@ declare module 'vscode' {
 		 * you can take other editor actions, such as showing a quick pick or
 		 * opening a configuration file.
 		 */
-		configureHandler?: () => void;
+		configureHandler: (() => void) | undefined;
 
 		/**
 		 * Handler called to start a test run. When invoked, the function should call
@@ -14259,7 +14259,7 @@ declare module 'vscode' {
 		 * The process of running tests should resolve the children of any test
 		 * items who have not yet been resolved.
 		 */
-		readonly include?: TestItem[];
+		readonly include: TestItem[] | undefined;
 
 		/**
 		 * An array of tests the user has marked as excluded from the test included
@@ -14268,14 +14268,14 @@ declare module 'vscode' {
 		 * May be omitted if no exclusions were requested. Test controllers should
 		 * not run excluded tests or any children of excluded tests.
 		 */
-		readonly exclude?: TestItem[];
+		readonly exclude: TestItem[] | undefined;
 
 		/**
 		 * The profile used for this request. This will always be defined
 		 * for requests issued from the editor UI, though extensions may
 		 * programmatically create requests not associated with any profile.
 		 */
-		readonly profile?: TestRunProfile;
+		readonly profile: TestRunProfile | undefined;
 
 		/**
 		 * @param tests Array of specific tests to run, or undefined to run all tests
@@ -14294,7 +14294,7 @@ declare module 'vscode' {
 		 * disambiguate multiple sets of results in a test run. It is useful if
 		 * tests are run across multiple platforms, for example.
 		 */
-		readonly name?: string;
+		readonly name: string | undefined;
 
 		/**
 		 * A cancellation token which will be triggered when the test run is
@@ -14434,7 +14434,7 @@ declare module 'vscode' {
 		/**
 		 * URI this `TestItem` is associated with. May be a file or directory.
 		 */
-		readonly uri?: Uri;
+		readonly uri: Uri | undefined;
 
 		/**
 		 * The children of this test item. For a test suite, this may contain the
@@ -14447,7 +14447,7 @@ declare module 'vscode' {
 		 * top-level items in the {@link TestController.items} and for items that
 		 * aren't yet included in another item's {@link children}.
 		 */
-		readonly parent?: TestItem;
+		readonly parent: TestItem | undefined;
 
 		/**
 		 * Tags associated with this test item. May be used in combination with
@@ -14489,7 +14489,7 @@ declare module 'vscode' {
 		 *
 		 * This is only meaningful if the `uri` points to a file.
 		 */
-		range?: Range;
+		range: Range | undefined;
 
 		/**
 		 * Optional error encountered while loading the test.
@@ -14497,7 +14497,7 @@ declare module 'vscode' {
 		 * Note that this is not a test result and should only be used to represent errors in
 		 * test discovery, such as syntax errors.
 		 */
-		error?: string | MarkdownString;
+		error: string | MarkdownString | undefined;
 	}
 
 	/**
diff --git a/src/vs/workbench/api/common/extHostTypeConverters.ts b/src/vs/workbench/api/common/extHostTypeConverters.ts
index 1b32b078f3208f6ce6df371fae9258dfb1da631a..8e366e8de4bf1dc54f817cee04cca3b4b623fa07 100644
--- a/src/vs/workbench/api/common/extHostTypeConverters.ts
+++ b/src/vs/workbench/api/common/extHostTypeConverters.ts
@@ -1728,6 +1728,8 @@ export namespace TestItem {
 
 	export function toPlain(item: ITestItem): Omit<vscode.TestItem, 'children' | 'invalidate' | 'discoverChildren'> {
 		return {
+			parent: undefined,
+			error: undefined,
 			id: TestId.fromString(item.extId).localId,
 			label: item.label,
 			uri: URI.revive(item.uri),
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index c81922e38ea3a3eef38ef64cef3de81a7b53c600..fc80501f22cb770a73d5f5c2f6129229976f4b5d 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -3328,9 +3328,9 @@ export enum TestRunProfileKind {
 @es5ClassCompat
 export class TestRunRequest implements vscode.TestRunRequest {
 	constructor(
-		public readonly include?: vscode.TestItem[],
-		public readonly exclude?: vscode.TestItem[] | undefined,
-		public readonly profile?: vscode.TestRunProfile,
+		public readonly include: vscode.TestItem[] | undefined = undefined,
+		public readonly exclude: vscode.TestItem[] | undefined = undefined,
+		public readonly profile: vscode.TestRunProfile | undefined = undefined,
 	) { }
 }
 
diff --git a/src/vs/workbench/test/browser/api/extHostTesting.test.ts b/src/vs/workbench/test/browser/api/extHostTesting.test.ts
index 486c2537128a0087ac9a6a04f51e76ee8788fc1c..7a5398a7eefb6daa4fce51e54fcb2728ac0c9486 100644
--- a/src/vs/workbench/test/browser/api/extHostTesting.test.ts
+++ b/src/vs/workbench/test/browser/api/extHostTesting.test.ts
@@ -7,16 +7,16 @@ import * as assert from 'assert';
 import { VSBuffer } from 'vs/base/common/buffer';
 import { CancellationTokenSource } from 'vs/base/common/cancellation';
 import { Iterable } from 'vs/base/common/iterator';
+import { URI } from 'vs/base/common/uri';
 import { mockObject, MockObject } from 'vs/base/test/common/mock';
 import { MainThreadTestingShape } from 'vs/workbench/api/common/extHost.protocol';
 import { TestRunCoordinator, TestRunDto, TestRunProfileImpl } from 'vs/workbench/api/common/extHostTesting';
 import * as convert from 'vs/workbench/api/common/extHostTypeConverters';
-import { TestMessage, TestResultState, TestRunProfileKind, TestTag, Location, Position, Range } from 'vs/workbench/api/common/extHostTypes';
+import { Location, Position, Range, TestMessage, TestResultState, TestRunProfileKind, TestRunRequest as TestRunRequestImpl, TestTag } from 'vs/workbench/api/common/extHostTypes';
 import { TestDiffOpType, TestItemExpandState, TestMessageType } from 'vs/workbench/contrib/testing/common/testCollection';
 import { TestId } from 'vs/workbench/contrib/testing/common/testId';
 import { TestItemImpl, testStubs } from 'vs/workbench/contrib/testing/common/testStubs';
 import { TestSingleUseCollection } from 'vs/workbench/contrib/testing/test/common/ownedTestCollection';
-import { URI } from 'vs/base/common/uri';
 import type { TestItem, TestRunRequest } from 'vscode';
 
 const simplify = (item: TestItem) => ({
@@ -654,7 +654,7 @@ suite('ExtHost Testing', () => {
 			const childB = new TestItemImpl('ctrlId', 'id-child', 'child', undefined);
 			testB!.children.replace([childB]);
 
-			const task1 = c.createTestRun('ctrl', single, {}, 'hello world', false);
+			const task1 = c.createTestRun('ctrl', single, new TestRunRequestImpl(), 'hello world', false);
 			const tracker = Iterable.first(c.trackers)!;
 
 			task1.passed(childA);