Make fixtures/commit.rb deterministic

spec/javascripts/fixtures/commit.rb

@@ -16,6 +16,7 @@ describe Projects::CommitController, '(JavaScript fixtures)', type: :controller
   before do
     project.add_maintainer(user)
     sign_in(user)
+    allow(SecureRandom).to receive(:hex).and_return('securerandomhex:thereisnospoon')
   end
 
   it 'commit/show.html.raw' do |example|