Properly disable WebMock and fix spec

Closes #4528

features/steps/group_hooks.rb

@@ -41,14 +41,12 @@ class Spinach::Features::GroupHooks < Spinach::FeatureSteps
   end
 
   step 'I click test hook button' do
-    WebMock.enable!
     stub_request(:post, @hook.url).to_return(status: 200)
     click_link 'Test'
-    WebMock.disable!
   end
 
   step 'I click test hook button with invalid URL' do
-    stub_request(:post, @hook.url).to_raise(SocketError)
+    stub_request(:post, @hook.url).to_raise(SocketError.new('Failed to open'))
     click_link 'Test'
   end
 

features/support/env.rb

@@ -21,7 +21,8 @@ end
 
 Dir["#{Rails.root}/features/steps/shared/*.rb"].each { |file| require file }
 
-WebMock.allow_net_connect!
+WebMock.enable!
+WebMock.disable_net_connect!(allow_localhost: true)
 
 Spinach.hooks.before_run do
   include RSpec::Mocks::ExampleMethods