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import pandas as pd


def test_get_channel_with_multi_recipients() -> None:
    """
    Test the _get_channel function to ensure it will return a string
    with recipients separated by commas without interstitial spacing
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent
    from superset.reports.notifications.slack import SlackNotification

    content = NotificationContent(
        name="test alert",
        header_data={
            "notification_format": "PNG",
            "notification_type": "Alert",
            "owners": [1],
            "notification_source": None,
            "chart_id": None,
            "dashboard_id": None,
        },
        embedded_data=pd.DataFrame(
            {
                "A": [1, 2, 3],
                "B": [4, 5, 6],
                "C": ["111", "222", '<a href="http://www.example.com">333</a>'],
            }
        ),
        description='<p>This is <a href="#">a test</a> alert</p><br />',
    )
    slack_notification = SlackNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.SLACK,
            recipient_config_json='{"target": "some_channel; second_channel, third_channel"}',
        ),
        content=content,
    )

    result = slack_notification._get_channel()

    assert result == "some_channel,second_channel,third_channel"