improve electron tests (avoid errors in github workflows) (#2977)

Fix electron tests failing sometimes in github workflow.

CHANGELOG.md

@@ -51,6 +51,7 @@ Special thanks to: @rejas, @sdetweil, @MagMar94
 - Possibility to change FontAwesome class in calendar, so icons like `fab fa-facebook-square` works.
 - Fix cors problems with newsfeed articles (as far as possible), allow disabling cors per feed with option `useCorsProxy: false` (#2840)
 - Tests not waiting for the application to start and stop before starting the next test
+- Fix electron tests failing sometimes in github workflow
 - Fixed gap in clock module when displayed on the left side with displayType=digital
 
 ## [2.21.0] - 2022-10-01

tests/electron/helpers/global-setup.js

@@ -10,19 +10,22 @@ exports.startApplication = async (configFilename, systemDate = null, electronPar
 	process.env.TZ = "GMT";
 	jest.retryTimes(3);
 	global.electronApp = await electron.launch({ args: electronParams });
-	expect(global.electronApp);
 
-	if ((await global.electronApp.windows().length) === 1) {
-		global.page = await global.electronApp.firstWindow();
-		if (systemDate) {
-			await global.page.evaluate((systemDate) => {
-				Date.now = () => {
-					return new Date(systemDate);
-				};
-			}, systemDate);
+	await global.electronApp.firstWindow();
+
+	for (const win of global.electronApp.windows()) {
+		const title = await win.title();
+		expect(["MagicMirror²", "DevTools"]).toContain(title);
+		if (title === "MagicMirror²") {
+			global.page = win;
+			if (systemDate) {
+				await global.page.evaluate((systemDate) => {
+					Date.now = () => {
+						return new Date(systemDate);
+					};
+				}, systemDate);
+			}
 		}
-		expect(await global.page.title()).toBe("MagicMirror²");
-		expect(await global.page.isVisible("body")).toBe(true);
 	}
 };