Fix "retrieve notification key" query

Before, we were sending the wrong parameters to the "retrieve
notification key" endpoint. By submitting invalid arguments, we were
causing every request to fail. We fixed the query for the "retrieve
notification key" endpoint.

Author: purinkle

lib/fcm.rb

@@ -89,11 +89,7 @@ def remove_registration_ids(key_name, project_id, notification_key, registration
   alias remove remove_registration_ids
 
   def recover_notification_key(key_name, project_id)
-    params = {
-      query: {
-        notification_key_name: key_name
-      }
-    }
+    params = {notification_key_name: key_name}
 
     extra_headers = {
       'project_id' => project_id

spec/fcm_spec.rb

@@ -472,6 +472,25 @@
     end # remove context
   end
 
+  describe "#recover_notification_key" do
+    it "sends a 'retrieve notification key' request" do
+      uri = "#{FCM::GROUP_NOTIFICATION_BASE_URI}/gcm/notification"
+      endpoint = stub_request(:get, uri).with(
+        headers: {
+          'Content-Type' => 'application/json',
+          'Authorization' => "key=TEST_SERVER_KEY",
+          'project_id' => "TEST_PROJECT_ID"
+        },
+        query: {notification_key_name: "TEST_KEY_NAME"}
+      )
+      client = FCM.new("TEST_SERVER_KEY")
+
+      client.recover_notification_key("TEST_KEY_NAME", "TEST_PROJECT_ID")
+
+      expect(endpoint).to have_been_requested
+    end
+  end
+
   describe 'subscribing to a topic' do
     # TODO
   end