diff --git a/tests/RelationsTest.php b/tests/RelationsTest.php
index 39edbb030..4372f6b7d 100644
--- a/tests/RelationsTest.php
+++ b/tests/RelationsTest.php
@@ -12,6 +12,7 @@ public function tearDown()
         Item::truncate();
         Role::truncate();
         Client::truncate();
+        Group::truncate();
     }
 
     public function testHasMany()
@@ -126,16 +127,22 @@ public function testEasyRelation()
         $this->assertEquals('admin', $role->type);
     }
 
-    public function testHasManyAndBelongsTo()
+    public function testBelongsToMany()
     {
         $user = User::create(array('name' => 'John Doe'));
 
+        // Add 2 clients
         $user->clients()->save(new Client(array('name' => 'Pork Pies Ltd.')));
         $user->clients()->create(array('name' => 'Buffet Bar Inc.'));
 
+        // Refetch
         $user = User::with('clients')->find($user->_id);
         $client = Client::with('users')->first();
 
+        // Check for relation attributes
+        $this->assertTrue(array_key_exists('user_ids', $client->getAttributes()));
+        $this->assertTrue(array_key_exists('client_ids', $user->getAttributes()));
+
         $clients = $client->getRelation('users');
         $users = $user->getRelation('clients');
 
@@ -194,7 +201,7 @@ public function testHasManyAndBelongsTo()
         $this->assertCount(1, $client->users);
     }
 
-    public function testHasManyAndBelongsToAttachesExistingModels()
+    public function testBelongsToManyAttachesExistingModels()
     {
         $user = User::create(array('name' => 'John Doe', 'client_ids' => array('1234523')));
 
@@ -222,12 +229,34 @@ public function testHasManyAndBelongsToAttachesExistingModels()
         // Add more clients
         $user->clients()->sync($moreClients);
 
+        // Refetch
         $user = User::with('clients')->find($user->_id);
 
         // Assert there are now still 2 client objects in the relationship
         $this->assertCount(2, $user->clients);
-		// Assert that the new relationships name start with synced
-		$this->assertStringStartsWith('synced', $user->clients[0]->name);
-		$this->assertStringStartsWith('synced', $user->clients[1]->name);
+
+        // Assert that the new relationships name start with synced
+        $this->assertStringStartsWith('synced', $user->clients[0]->name);
+        $this->assertStringStartsWith('synced', $user->clients[1]->name);
+    }
+
+    public function testBelongsToManyCustom()
+    {
+        $user = User::create(array('name' => 'John Doe'));
+        $group = $user->groups()->create(array('name' => 'Admins'));
+
+        // Refetch
+        $user = User::find($user->_id);
+        $group = Group::find($group->_id);
+
+        // Check for custom relation attributes
+        $this->assertTrue(array_key_exists('users', $group->getAttributes()));
+        $this->assertTrue(array_key_exists('groups', $user->getAttributes()));
+
+        // Assert they are attached
+        $this->assertTrue(in_array($group->_id, $user->groups));
+        $this->assertTrue(in_array($user->_id, $group->users));
+        $this->assertEquals($group->_id, $user->groups()->first()->_id);
+        $this->assertEquals($user->_id, $group->users()->first()->_id);
     }
 }
diff --git a/tests/models/Client.php b/tests/models/Client.php
index de55ceab6..2660e00b7 100644
--- a/tests/models/Client.php
+++ b/tests/models/Client.php
@@ -6,9 +6,9 @@ class Client extends Eloquent {
 	protected $collection = 'clients';
 
 	protected static $unguarded = true;
-	
+
 	public function users()
 	{
 		return $this->belongsToMany('User');
 	}
-}
\ No newline at end of file
+}
diff --git a/tests/models/Group.php b/tests/models/Group.php
new file mode 100644
index 000000000..5332948d3
--- /dev/null
+++ b/tests/models/Group.php
@@ -0,0 +1,14 @@
+<?php
+use Jenssegers\Mongodb\Model as Eloquent;
+
+class Group extends Eloquent {
+
+	protected $collection = 'groups';
+
+	protected static $unguarded = true;
+
+	public function users()
+	{
+		return $this->belongsToMany('User', 'test_collection', 'groups', 'users');
+	}
+}
diff --git a/tests/models/User.php b/tests/models/User.php
index 652d48f51..5a8d352fe 100644
--- a/tests/models/User.php
+++ b/tests/models/User.php
@@ -8,9 +8,9 @@
 class User extends Eloquent implements UserInterface, RemindableInterface {
 
 	protected $collection = 'users';
-	
+
 	protected $dates = array('birthday');
-	
+
 	protected static $unguarded = true;
 
 	public function books()
@@ -27,12 +27,17 @@ public function role()
     {
         return $this->hasOne('Role');
     }
-	
+
 	public function clients()
 	{
 		return $this->belongsToMany('Client');
 	}
 
+    public function groups()
+    {
+        return $this->belongsToMany('Group', 'test_collection', 'users', 'groups');
+    }
+
     /**
      * Get the unique identifier for the user.
      *
@@ -62,4 +67,4 @@ public function getReminderEmail()
     {
         return $this->email;
     }
-}
\ No newline at end of file
+}