[Subscription] Cancel google subscription(#386)

Author: imdhemy

src/Subscription.php

@@ -202,4 +202,12 @@ public function get(): SubscriptionPurchase
 
         return $this->googleGetResponse;
     }
+
+    /**
+     * @throws GuzzleException
+     */
+    public function cancel(): EmptyResponse
+    {
+        return $this->createSubscription()->cancel();
+    }
 }

tests/Facades/SubscriptionTest.php

@@ -116,4 +116,18 @@ public function test_it_handles_the_21007_error_from_the_app_store()
 
         $this->assertTrue($response->getStatus()->isValid());
     }
+
+    /** @test */
+    public function cancel_google_subscription(): void
+    {
+        $this->expectNotToPerformAssertions();
+
+        $client = GoogleClientFactory::mock(new Response());
+
+        Subscription::googlePlay($client)
+            ->packageName('com.twigano.fashion')
+            ->id($this->itemId)
+            ->token($this->token)
+            ->cancel();
+    }
 }