How to use the pyppeteer.browser.Browser function in pyppeteer

async def test_async_browser_session():
    session = AsyncHTMLSession()
    browser = await session.browser
    assert isinstance(browser, Browser)
    await session.close()

def test_browser_session():
    """ Test browser instaces is created and properly close when session is closed.
        Note: session.close method need to be tested together with browser creation,
            since no doing that will left the browser running. """
    session = HTMLSession()
    assert isinstance(session.browser, Browser)
    assert hasattr(session, "loop") == True
    session.close()
    # assert count_chromium_process() == 0

async def _targetInfoChanged(self, event: Dict) -> None:
        target = self._targets.get(event['targetInfo']['targetId'])
        if not target:
            raise BrowserError('target should exist before targetInfoChanged')
        previousURL = target.url
        wasInitialized = target._isInitialized
        target._targetInfoChanged(event['targetInfo'])
        if wasInitialized and previousURL != target.url:
            self.emit(Browser.Events.TargetChanged, target)
            target.browserContext.emit(BrowserContext.Events.TargetChanged, target)  # noqa: E501

async def create(connection: Connection, contextIds: List[str],
                     ignoreHTTPSErrors: bool, defaultViewport: Optional[Dict],
                     process: Optional[Popen] = None,
                     closeCallback: Callable[[], Awaitable[None]] = None,
                     **kwargs: Any) -> 'Browser':
        """Create browser object."""
        browser = Browser(connection, contextIds, ignoreHTTPSErrors,
                          defaultViewport, process, closeCallback)
        await connection.send('Target.setDiscoverTargets', {'discover': True})
        return browser

def __init__(self, settings: Settings):
        self._browser: Optional[Browser] = None
        self._launch_options = settings.getdict('PYPPETEER_LAUNCH') or {}