Move non-IO like objects check outside of array in spec

Author: cacheflow

spec/fcm_spec.rb

@@ -68,13 +68,20 @@
     end
 
     it 'raises an error when passed a non IO-like object' do
-      [
-        FCM.new(nil, '', {}),
-        FCM.new({}, '', {}),
-        FCM.new(json_credentials, '', {})
-      ].each do |fcm|
-        expect { fcm.__send__(:json_key) }.to raise_error(creds_error)
-      end
+      expect do 
+        FCM.new(nil, '', {}).__send__(:json_key)
+      end.to raise_error(creds_error, 'credentials must be' \
+      ' an IO-like object or path. You passed nil.')
+      
+      expect do 
+        FCM.new(json_credentials, '', {}).__send__(:json_key) 
+      end.to raise_error(creds_error, 'credentials must be' \
+      ' an IO-like object or path. You passed a String.')
+      
+      expect do 
+        FCM.new({}, '', {}).__send__(:json_key)
+      end.to raise_error(creds_error, 'credentials must be' \
+      ' an IO-like object or path. You passed a Hash.')
     end
 
     it 'raises an error when passed a non-existent credentials file path' do