diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
index 31b471570a1..3949c1d1727 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
@@ -5,7 +5,7 @@
 
 import * as assert from 'assert';
 import * as vscode from 'vscode';
-import { createRandomFile, deleteFile, closeAllEditors, pathEquals, rndName, disposeAll, testFs, delay, withLogDisabled } from '../utils';
+import { createRandomFile, deleteFile, closeAllEditors, pathEquals, rndName, disposeAll, testFs, delay, withLogDisabled, revertAllDirty } from '../utils';
 import { join, posix, basename } from 'path';
 import * as fs from 'fs';
 import { TestFS } from '../memfs';
@@ -288,7 +288,7 @@ suite('vscode API - workspace', () => {
 		const file = await createRandomFile();
 		let disposables: vscode.Disposable[] = [];
 
-		await vscode.workspace.saveAll();
+		await revertAllDirty(); // needed for a clean state for `onDidSaveTextDocument` (#102365)
 
 		let pendingAsserts: Function[] = [];
 		let onDidOpenTextDocument = false;
@@ -330,6 +330,8 @@ suite('vscode API - workspace', () => {
 		let disposables: vscode.Disposable[] = [];
 		let pendingAsserts: Function[] = [];
 
+		await revertAllDirty(); // needed for a clean state for `onDidSaveTextDocument` (#102365)
+
 		let onDidSaveTextDocument = false;
 		disposables.push(vscode.workspace.onDidSaveTextDocument(e => {
 			pendingAsserts.push(() => assertEqualPath(e.uri.fsPath, file.fsPath));
diff --git a/extensions/vscode-api-tests/src/utils.ts b/extensions/vscode-api-tests/src/utils.ts
index 3c34028feb4..e6a002aad2c 100644
--- a/extensions/vscode-api-tests/src/utils.ts
+++ b/extensions/vscode-api-tests/src/utils.ts
@@ -48,6 +48,10 @@ export function closeAllEditors(): Thenable<any> {
 	return vscode.commands.executeCommand('workbench.action.closeAllEditors');
 }
 
+export async function revertAllDirty(): Promise<void> {
+	return vscode.commands.executeCommand('_workbench.revertAllDirty');
+}
+
 export function disposeAll(disposables: vscode.Disposable[]) {
 	vscode.Disposable.from(...disposables).dispose();
 }
diff --git a/src/vs/workbench/api/browser/mainThreadEditors.ts b/src/vs/workbench/api/browser/mainThreadEditors.ts
index c6fdc10d334..157d9502816 100644
--- a/src/vs/workbench/api/browser/mainThreadEditors.ts
+++ b/src/vs/workbench/api/browser/mainThreadEditors.ts
@@ -27,6 +27,8 @@ import { IEditorGroupsService } from 'vs/workbench/services/editor/common/editor
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IQuickInputService } from 'vs/platform/quickinput/common/quickInput';
 import { openEditorWith } from 'vs/workbench/services/editor/common/editorOpenWith';
+import { IEnvironmentService } from 'vs/platform/environment/common/environment';
+import { IWorkingCopyService } from 'vs/workbench/services/workingCopy/common/workingCopyService';
 
 export class MainThreadTextEditors implements MainThreadTextEditorsShape {
 
@@ -331,3 +333,15 @@ CommandsRegistry.registerCommand('_workbench.diff', function (accessor: Services
 
 	return editorService.openEditor({ leftResource, rightResource, label, description, options }, viewColumnToEditorGroup(editorGroupService, position)).then(() => undefined);
 });
+
+CommandsRegistry.registerCommand('_workbench.revertAllDirty', (accessor: ServicesAccessor) => {
+	const environmentService = accessor.get(IEnvironmentService);
+	if (!environmentService.extensionTestsLocationURI) {
+		throw new Error('Command is only available when running extension tests.');
+	}
+
+	const workingCopyService = accessor.get(IWorkingCopyService);
+	for (const workingCopy of workingCopyService.dirtyWorkingCopies) {
+		workingCopy.revert({ soft: true });
+	}
+});