Fix incorrect render in JUnit merge UI with null or blank name value

Previously test cases in merges with no name associated would not
render a clickable link. This change makes sure that if no field is
present, `(No name)` will render to provide a clickable link to inspect
the test.

Changelog: fixed
Authored-by: Bob Whitmer <rjwhitmercc@gmail.com>
Signed-off-by: Rémy Coutable <remy@rymai.me>

app/serializers/test_case_entity.rb

@@ -4,7 +4,7 @@ class TestCaseEntity < Grape::Entity
   include API::Helpers::RelatedResourcesHelpers
 
   expose :status
-  expose :name
+  expose :name, default: "(No name)"
   expose :classname
   expose :file
   expose :execution_time

spec/serializers/test_case_entity_spec.rb

@@ -41,6 +41,18 @@ RSpec.describe TestCaseEntity do
       end
     end
 
+    context 'when no test name is entered' do
+      let(:test_case) { build(:report_test_case, name: "") }
+
+      it 'contains correct test case details' do
+        expect(subject[:status]).to eq('success')
+        expect(subject[:name]).to eq('(No name)')
+        expect(subject[:classname]).to eq('trace')
+        expect(subject[:file]).to eq('spec/trace_spec.rb')
+        expect(subject[:execution_time]).to eq(1.23)
+      end
+    end
+
     context 'when attachment is present' do
       let(:test_case) { build(:report_test_case, :failed_with_attachment, job: job) }