diff --git a/changelogs/unreleased/add-unicode-trace-feature-test.yml b/changelogs/unreleased/add-unicode-trace-feature-test.yml
new file mode 100644
index 00000000000..90c6a9afefc
--- /dev/null
+++ b/changelogs/unreleased/add-unicode-trace-feature-test.yml
@@ -0,0 +1,4 @@
+---
+title: Add a feature test for Unicode trace
+merge_request: 10736
+author: dosuken123
diff --git a/spec/controllers/projects/builds_controller_spec.rb b/spec/controllers/projects/builds_controller_spec.rb
index 3ce23c17cdc..f41503fd34e 100644
--- a/spec/controllers/projects/builds_controller_spec.rb
+++ b/spec/controllers/projects/builds_controller_spec.rb
@@ -144,6 +144,8 @@ describe Projects::BuildsController do
 
       it 'returns a trace' do
         expect(response).to have_http_status(:ok)
+        expect(json_response['id']).to eq build.id
+        expect(json_response['status']).to eq build.status
         expect(json_response['html']).to eq('BUILD TRACE')
       end
     end
@@ -153,10 +155,23 @@ describe Projects::BuildsController do
 
       it 'returns no traces' do
         expect(response).to have_http_status(:ok)
+        expect(json_response['id']).to eq build.id
+        expect(json_response['status']).to eq build.status
         expect(json_response['html']).to be_nil
       end
     end
 
+    context 'when build has a trace with ANSI sequence and Unicode' do
+      let(:build) { create(:ci_build, :unicode_trace, pipeline: pipeline) }
+
+      it 'returns a trace with Unicode' do
+        expect(response).to have_http_status(:ok)
+        expect(json_response['id']).to eq build.id
+        expect(json_response['status']).to eq build.status
+        expect(json_response['html']).to include("ヾ(´༎ຶД༎ຶ`)ﾉ")
+      end
+    end
+
     def get_trace
       get :trace, namespace_id: project.namespace,
                   project_id: project,
@@ -185,48 +200,6 @@ describe Projects::BuildsController do
     end
   end
 
-  describe 'GET trace.json' do
-    let(:pipeline) { create(:ci_pipeline, project: project) }
-    let(:build) { create(:ci_build, pipeline: pipeline) }
-    let(:user) { create(:user) }
-
-    context 'when user is logged in as developer' do
-      before do
-        project.add_developer(user)
-        sign_in(user)
-
-        get_trace
-      end
-
-      it 'traces build log' do
-        expect(response).to have_http_status(:ok)
-        expect(json_response['id']).to eq build.id
-        expect(json_response['status']).to eq build.status
-      end
-    end
-
-    context 'when user is logged in as non member' do
-      before do
-        sign_in(user)
-
-        get_trace
-      end
-
-      it 'traces build log' do
-        expect(response).to have_http_status(:ok)
-        expect(json_response['id']).to eq build.id
-        expect(json_response['status']).to eq build.status
-      end
-    end
-
-    def get_trace
-      get :trace, namespace_id: project.namespace,
-                  project_id: project,
-                  id: build.id,
-                  format: :json
-    end
-  end
-
   describe 'POST retry' do
     before do
       project.add_developer(user)
diff --git a/spec/factories/ci/builds.rb b/spec/factories/ci/builds.rb
index 78ddd8d5584..f5e99fdf00b 100644
--- a/spec/factories/ci/builds.rb
+++ b/spec/factories/ci/builds.rb
@@ -128,6 +128,16 @@ FactoryGirl.define do
       end
     end
 
+    trait :unicode_trace do
+      after(:create) do |build, evaluator|
+        trace = File.binread(
+          File.expand_path(
+            Rails.root.join('spec/fixtures/trace/ansi-sequence-and-unicode')))
+
+        build.trace.set(trace)
+      end
+    end
+
     trait :erased do
       erased_at Time.now
       erased_by factory: :user