sped up some tests

spec/concerns/submission_scoring_spec.rb

@@ -9,7 +9,7 @@ describe SubmissionScoring do
   let(:submission) { FactoryGirl.create(:submission, cause: 'submit') }
   before(:each) { controller.instance_variable_set(:@current_user, FactoryGirl.create(:external_user)) }
 
-  describe '#score_submission', docker: true do
+  describe '#score_submission' do
     let(:score_submission) { Proc.new { controller.score_submission(submission) } }
     before(:each) { score_submission.call }
 
@@ -23,7 +23,7 @@ describe SubmissionScoring do
 
     it 'executes the teacher-defined test cases' do
       submission.collect_files.select(&:teacher_defined_test?).each do |file|
-        expect_any_instance_of(DockerClient).to receive(:execute_test_command).with(submission, file.name_with_extension).and_call_original
+        expect_any_instance_of(DockerClient).to receive(:execute_test_command).with(submission, file.name_with_extension).and_return({})
       end
       score_submission.call
     end