Add CheckGCPProjectBillingService

app/services/check_gcp_project_billing_service.rb

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

spec/services/check_gcp_project_billing_service_spec.rb

+require 'spec_helper'
+
+describe CheckGCPProjectBillingService do
+  let(:service) { described_class.new }
+
+  describe '#execute' do
+    before do
+      expect_any_instance_of(GoogleApi::CloudPlatform::Client)
+        .to receive(:projects_list).and_return([double(name: 'project_name')])
+
+      expect_any_instance_of(GoogleApi::CloudPlatform::Client)
+        .to receive_message_chain(:projects_get_billing_info, :billingEnabled)
+        .and_return(project_billing_enabled)
+    end
+
+    subject { service.execute('bogustoken') }
+
+    context 'google account has a billing enabled gcp project' do
+      let(:project_billing_enabled) { true }
+
+      it { is_expected.to eq(true) }
+    end
+
+    context 'google account does not have a billing enabled gcp project' do
+      let(:project_billing_enabled) { false }
+
+      it { is_expected.to eq(false) }
+    end
+  end
+end