Silence Grape warnings

test/grape_test.rb

@@ -1,5 +1,7 @@
 require 'test_helper'
-require 'grape'
+TestHelper.silence_warnings do
+  require 'grape'
+end
 require 'grape/active_model_serializers'
 require 'kaminari'
 require 'kaminari/hooks'
@@ -53,7 +55,15 @@ def self.collection
 
     class GrapeTest < Grape::API
       format :json
-      include Grape::ActiveModelSerializers
+      TestHelper.silence_warnings do
+        include Grape::ActiveModelSerializers
+      end
+
+      def self.resources(*)
+        TestHelper.silence_warnings do
+          super
+        end
+      end
 
       resources :grape do
         get '/render' do
@@ -93,6 +103,14 @@ def app
       Grape::Middleware::Globals.new(GrapeTest.new)
     end
 
+    extend Minitest::Assertions
+    def self.run_one_method(*)
+      _, stderr = capture_io do
+        super
+      end
+      fail Minitest::Assertion, stderr if stderr !~ /grape/
+    end
+
     def test_formatter_returns_json
       get '/grape/render'
 

test/test_helper.rb

@@ -40,6 +40,18 @@ def serialization_options(options)
 require 'minitest/autorun'
 Minitest.backtrace_filter = Minitest::BacktraceFilter.new
 
+module TestHelper
+  module_function
+
+  def silence_warnings
+    original_verbose = $VERBOSE
+    $VERBOSE = nil
+    yield
+  ensure
+    $VERBOSE = original_verbose
+  end
+end
+
 require 'support/rails_app'
 
 # require "rails/test_help"