Fix typo in spec. Add a test for the case of when trace is stored in database

spec/lib/gitlab/background_migration/archive_legacy_traces_spec.rb

@@ -16,7 +16,7 @@ describe Gitlab::BackgroundMigration::ArchiveLegacyTraces, :migration, schema: 2
 
   context 'when trace file exsits at the right place' do
     before do
-      create_legacy_trace(@build, 'aiueo')
+      create_legacy_trace(@build, 'trace in file')
     end
 
     it 'correctly archive legacy traces' do
@@ -27,15 +27,33 @@ describe Gitlab::BackgroundMigration::ArchiveLegacyTraces, :migration, schema: 2
 
       expect(job_artifacts.count).to eq(1)
       expect(File.exist?(legacy_trace_path(@build))).to be_falsy
-      expect(File.read(archived_trace_path(job_artifacts.first))).to eq('aiueo')
+      expect(File.read(archived_trace_path(job_artifacts.first))).to eq('trace in file')
     end
   end
 
   context 'when trace file does not exsits at the right place' do
-    it 'does not raise errors and create job artifact row' do
-      described_class.new.perform(1, 1)
+    it 'does not raise errors nor create job artifact' do
+      expect { described_class.new.perform(1, 1) }.not_to raise_error
 
       expect(job_artifacts.count).to eq(0)
     end
   end
+
+  context 'when trace data exsits in database' do
+    before do
+      create_legacy_trace_in_db(@build, 'trace in db')
+    end
+
+    it 'correctly archive legacy traces' do
+      expect(job_artifacts.count).to eq(0)
+      expect(@build.read_attribute(:trace)).not_to be_empty
+
+      described_class.new.perform(1, 1)
+
+      @build.reload
+      expect(job_artifacts.count).to eq(1)
+      expect(@build.read_attribute(:trace)).to be_nil
+      expect(File.read(archived_trace_path(job_artifacts.first))).to eq('trace in db')
+    end
+  end
 end

spec/support/trace/trace_helpers.rb

@@ -3,6 +3,10 @@ module TraceHelpers
     File.open(legacy_trace_path(build), 'wb') { |stream| stream.write(content) }
   end
 
+  def create_legacy_trace_in_db(build, content)
+    build.update_column(:trace, content)
+  end
+
   def legacy_trace_path(build)
     legacy_trace_dir = File.join(Settings.gitlab_ci.builds_path,
       build.created_at.utc.strftime("%Y_%m"),