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Test Info:

add_task(async function parent_to_remote() {
await BrowserTestUtils.withNewTab("about:mozilla", async browser => {
let originalBC = browser.browsingContext;
BrowserTestUtils.startLoadingURIString(browser, "https://example.com/");
await BrowserTestUtils.browserLoaded(browser);
let newBC = browser.browsingContext;
isnot(originalBC.id, newBC.id, "Should have replaced the BrowsingContext");
});
});
add_task(async function remote_to_parent() {
await BrowserTestUtils.withNewTab("https://example.com/", async browser => {
let originalBC = browser.browsingContext;
BrowserTestUtils.startLoadingURIString(browser, "about:mozilla");
await BrowserTestUtils.browserLoaded(browser);
let newBC = browser.browsingContext;
isnot(originalBC.id, newBC.id, "Should have replaced the BrowsingContext");
});
});