diff --git a/spec/acceptance/formatter_spec.rb b/spec/acceptance/formatter_spec.rb
index 1457b96b..79982831 100644
--- a/spec/acceptance/formatter_spec.rb
+++ b/spec/acceptance/formatter_spec.rb
@@ -23,13 +23,16 @@
             }
 
             GemIsolator.isolate(gems: [%w(rspec ~>3.4)]) do |env, isolation|
+              env = env.merge(guard_env)
               system("pwd")
-              system("ls -l bundle")
-              system("gem env")
-              system("gem contents rspec")
+              system(env, "ls -l bundle/ruby/2.3.0/gems")
+              system(env, "gem env")
+              system(env, "gem contents rspec-core")
+              system(env, "which rspec")
+              system(env, "ls -l #{env['PATH'].split(':').first}")
               STDERR.puts cmd.inspect
               STDERR.puts env.inspect
-              result = isolation.system(env.merge(guard_env), cmd)
+              result = isolation.system(env, cmd)
               expect(result).to eq(true)
             end
           end