public function testDelete()
{
$this->connection->deleteSubscription(Argument::withEntry('foo', 'bar'))->willReturn(null)->shouldBeCalledTimes(1);
$subscription = new Subscription($this->connection->reveal(), 'subscription-name', 'topic-name', 'project-id');
$res = $subscription->delete(['foo' => 'bar']);
$this->assertNull($res);
}