Properly CamelCase service name

app/services/check_gcp_project_billing_service.rb

-class CheckGCPProjectBillingService
+class CheckGcpProjectBillingService
   def execute(token)
     client = GoogleApi::CloudPlatform::Client.new(token, nil)
     client.projects_list.any? do |project|

spec/lib/google_api/cloud_platform/client_spec.rb

@@ -62,8 +62,8 @@ describe GoogleApi::CloudPlatform::Client do
     it { is_expected.to eq(projects) }
   end
 
-  def projects_get_billing_info
-    subject { client.projects_get_billing_info }
+  describe '#projects_get_billing_info' do
+    subject { client.projects_get_billing_info('project') }
     let(:billing_info) { double }
 
     before do

spec/services/check_gcp_project_billing_service_spec.rb

 require 'spec_helper'
 
-describe CheckGCPProjectBillingService do
+describe CheckGcpProjectBillingService do
   let(:service) { described_class.new }
 
   describe '#execute' do