public async Task SubscribeAsync_SendsSubscribeCommandWithGivenTopic(string topic)
{
await _subscriber.SubscribeAsync <Event>(topic, x => { });
_fixture.MockConnectionMultiplexer.Verify(x => x.GetSubscriber(It.IsAny <object>()), Times.Once);
_fixture.MockSubscriber.Verify(x => x.SubscribeAsync(topic, It.IsAny <Action <RedisChannel, RedisValue> >(), It.IsAny <CommandFlags>()), Times.Once);
}