test: exit after app.relaunch is called (#28016)

spec-main/api-app-spec.ts

@@ -295,9 +295,9 @@ describe('app module', () => {
       const child = cp.spawn(process.execPath, [appPath]);
       child.stdout.on('data', (c) => console.log(c.toString()));
       child.stderr.on('data', (c) => console.log(c.toString()));
-      child.on('exit', (code) => {
+      child.on('exit', (code, signal) => {
         if (code !== 0) {
-          done(`Process exited with code ${code}`);
+          console.log(`Process exited with code "${code}" signal "${signal}"`);
         }
       });
     });

spec-main/extensions-spec.ts

@@ -152,13 +152,15 @@ describe('chrome extensions', () => {
     const [, loadedExtension] = await loadedPromise;
     const [, readyExtension] = await emittedOnce(customSession, 'extension-ready');
 
-    expect(loadedExtension).to.deep.equal(extension);
-    expect(readyExtension).to.deep.equal(extension);
+    // Compare JSON string to print more information if failed.
+    const expected = JSON.stringify(extension);
+    expect(JSON.stringify(loadedExtension)).to.equal(expected);
+    expect(JSON.stringify(readyExtension)).to.equal(expected);
 
     const unloadedPromise = emittedOnce(customSession, 'extension-unloaded');
     await customSession.removeExtension(extension.id);
     const [, unloadedExtension] = await unloadedPromise;
-    expect(unloadedExtension).to.deep.equal(extension);
+    expect(JSON.stringify(unloadedExtension)).to.equal(expected);
   });
 
   it('lists loaded extensions in getAllExtensions', async () => {

spec/fixtures/api/relaunch/main.js

@@ -14,10 +14,9 @@ app.whenReady().then(() => {
     client.end(String(lastArg === '--second'));
   });
   client.once('end', () => {
+    if (lastArg !== '--second') {
+      app.relaunch({ args: process.argv.slice(1).concat('--second') });
+    }
     app.exit(0);
   });
-
-  if (lastArg !== '--second') {
-    app.relaunch({ args: process.argv.slice(1).concat('--second') });
-  }
 });