fix unreliable test

src/vs/workbench/services/configuration/test/node/configurationService.test.ts

@@ -188,6 +188,8 @@ suite('WorkspaceConfigurationService - Node', () => {
 	test('global change triggers event', (done: () => void) => {
 		createWorkspace((workspaceDir, globalSettingsFile, cleanUp) => {
 			return createService(workspaceDir, globalSettingsFile).then(service => {
+				fs.writeFileSync(globalSettingsFile, '{ "testworkbench.editor.icons": false }');
+				service.reloadConfiguration().then(() => {
 					service.onDidUpdateConfiguration(event => {
 						const config = service.getConfiguration<{ testworkbench: { editor: { icons: boolean } } }>();
 						assert.equal(config.testworkbench.editor.icons, true);
@@ -202,6 +204,7 @@ suite('WorkspaceConfigurationService - Node', () => {
 				});
 			});
 		});
+	});
 
 	test('workspace change triggers event', (done: () => void) => {
 		createWorkspace((workspaceDir, globalSettingsFile, cleanUp) => {