def METHOD_NAME(region_name):
    """
    Verify that instance types exist in all exposed Availability Zones
    https://github.com/getmoto/moto/issues/5494
    """
    client = boto3.client("ec2", region_name=region_name)
    zones = client.describe_availability_zones()["AvailabilityZones"]
    zone_names = [z["ZoneName"] for z in zones]
    for zone in zone_names:
        offerings = client.describe_instance_type_offerings(
            LocationType="availability-zone",
            Filters=[{"Name": "location", "Values": [zone]}],
        )["InstanceTypeOfferings"]
        assert len(offerings) > 0