fix my 'fix' + failing unit tests

Author: matthewgoslett

src/GoogleCloudPubSubAdapter.php

@@ -190,7 +190,7 @@ protected function getSubscriptionForChannel($channel)
     {
         $topic = $this->getTopicForChannel($channel);
         $clientIdentifier = $this->clientIdentifier ? $this->clientIdentifier : 'default';
-        $clientIdentifier .= '.' . $topic;
+        $clientIdentifier .= '.' . $channel;
         $subscription = $topic->subscription($clientIdentifier);
         if ($this->autoCreateSubscriptions && !$subscription->exists()) {
             $subscription->create();

tests/GoogleCloudPubSubAdapterTest.php

@@ -172,7 +172,7 @@ public function testSubscribeWhenSubscriptionMustBeCreated()
             ->andReturn(true);
         $topic->shouldNotHaveReceived('create');
         $topic->shouldReceive('subscription')
-            ->with('default')
+            ->with('default.channel_name')
             ->once()
             ->andReturn($subscription);
 
@@ -247,7 +247,7 @@ public function testSubscribeWhenSubscriptionExists()
             ->andReturn(true);
         $topic->shouldNotHaveReceived('create');
         $topic->shouldReceive('subscription')
-            ->with('default')
+            ->with('default.channel_name')
             ->once()
             ->andReturn($subscription);
 
@@ -320,7 +320,7 @@ public function testSubscribeWhenAutoTopicCreationIsDisabled()
             ->andReturn(true);
         $topic->shouldNotHaveReceived('create');
         $topic->shouldReceive('subscription')
-            ->with('default')
+            ->with('default.channel_name')
             ->once()
             ->andReturn($subscription);