Fix typos and add a small spec

spec/models/ci/build_spec.rb

@@ -130,7 +130,7 @@ describe Ci::Build do
     context 'when build does not have live trace' do
       let!(:build) { create(:ci_build, :success, :trace_artifact) }
 
-      it 'selects the build' do
+      it 'does not select the build' do
         is_expected.to be_empty
       end
     end

spec/support/shared_examples/ci_trace_shared_examples.rb

@@ -246,12 +246,14 @@ shared_examples_for 'common trace features' do
           expect(build.job_artifacts_trace).to be_exist
         end
 
-        context 'when anothe process had already been archiving', :clean_gitlab_redis_shared_state do
+        context 'when another process has already been archiving', :clean_gitlab_redis_shared_state do
           before do
             Gitlab::ExclusiveLease.new("trace:archive:#{trace.job.id}", timeout: 1.hour).try_obtain
           end
 
-          it 'prevents to archive concurently' do
+          it 'blocks concurrent archiving' do
+            expect(Rails.logger).to receive(:error).with('Cannot obtain an exclusive lease. There must be another instance already in execution.')
+
             subject
 
             build.reload