Smoke tests: Add a comma at the end while adding a setting

test/smoke/src/areas/preferences/preferences.test.ts

@@ -20,10 +20,7 @@ describe('Preferences', () => {
 		await app.screenCapturer.capture('line numbers');
 		assert.ok(!!lineNumbers.length, 'Line numbers are not present in the editor before disabling them.');
 
-		await app.workbench.settingsEditor.openUserSettings();
-		await app.workbench.settingsEditor.focusEditableSettings();
-		await app.client.keys(`"editor.lineNumbers": "off"`);
-		await app.workbench.saveOpenedFile();
+		await app.workbench.settingsEditor.addUserSetting('editor.lineNumbers', '"off"');
 
 		await app.workbench.selectTab('app.js');
 		lineNumbers = await app.client.waitForElements('.line-numbers', result => !result || result.length === 0);

test/smoke/src/areas/preferences/settings.ts

@@ -30,9 +30,8 @@ export class SettingsEditor {
 	async addUserSetting(setting: string, value: string): Promise<void> {
 		await this.openUserSettings();
 
-		// await this.spectron.wait(1);
 		await this.focusEditableSettings();
-		await this.spectron.client.keys(`"${setting}": ${value}`);
+		await this.spectron.client.keys(`"${setting}": ${value},`);
 		await this.spectron.workbench.saveOpenedFile();
 	}
 }
\ No newline at end of file