[BUG] Disconnect\Reconnect not working in firefox[when using jest-playwright-preset]

[aishwaryadhage]

Context:

• Playwright Version: [1.0.2]
• Operating System: [Windows]
• Node version: [10.16.0]
• Browser: [Firefox]

Code Snippet

import { HTMLConstants } from "../Constants/HTMLConstants";
import { PageController } from "../Utils/PageController";
import { FeatureController} from "../Utils/FeatureController";
import { TestConfiguration} from "../Utils/TestConfiguration";
import { Utility } from "../Utils/Utility";
import { Frame } from "playwright";

const testSuite = "VRT for reconnect scenario";
describe(testSuite, () => {
    let iframeLCW: Frame;
    beforeAll(async () => {
        await page.goto(TestConfiguration.GetTestUrl());
iframeLCW = await PageController.GetIframe(page);
        await iframeLCW.waitForSelector(HTMLConstants.ChatButtonId);
        await iframeLCW.click(HTMLConstants.ChatButtonId);
    });

    afterAll(async () => {
        await page.close();
    });

    const spec1 = "it has disconnected baner";
    it(spec1, async () => {
        await iframeLCW.waitForSelector(HTMLConstants.SystemWelcomMessageSelector);
        await page.context().setOffline(true);
        await iframeLCW.waitForSelector(HTMLConstants.DisconnectedBannerSelector);
        const image = await page.screenshot();
        expect(image).toMatchImageSnapshot({
            customSnapshotIdentifier: Utility.SnapshotPath(testSuite, spec1)
        });
    });

    const spec2 = "it has reconnect banner";
    it(spec2, async () => {
        await page.context().setOffline(false);
        await iframeLCW.waitForSelector(HTMLConstants.ReconnectedBanerSelector);
        const image = await page.screenshot();
        expect(image).toMatchImageSnapshot({
            customSnapshotIdentifier: Utility.SnapshotPath(testSuite, spec2)
        });
    });
});

Describe the bug
This test is using jest-playwright-preset, this code makes use of iframe. In iframe if there is a reconnect disconnect scenario, a banner for the same shows up. When using firefox, the disconnect\reconnect banners do not appear. This works fine for chromium. We are facing this issue only for firefox.
Also, on firefox browsers, turning offline\online manualy works fine and shows the banners.

Please let me know if further details are required.

[aslushnikov]

@aishwaryadhage do I understand correctly that the online/offline status you set with page.context().setOffline() method is not propagated into the Iframe you're automating?