Remove tests which do not add value

spec/serializers/analytics_build_serializer_spec.rb

@@ -10,10 +10,6 @@ describe AnalyticsBuildSerializer do
   let(:resource) { create(:ci_build) }
 
   context 'when there is a single object provided' do
-    it 'it generates payload for single object' do
-      expect(json).to be_an_instance_of Hash
-    end
-
     it 'contains important elements of analyticsBuild' do
       expect(json)
         .to include(:name, :branch, :short_sha, :date, :total_time, :url, :author)

spec/serializers/analytics_issue_serializer_spec.rb

@@ -22,10 +22,6 @@ describe AnalyticsIssueSerializer do
   end
 
   context 'when there is a single object provided' do
-    it 'it generates payload for single object' do
-      expect(json).to be_an_instance_of Hash
-    end
-
     it 'contains important elements of the issue' do
       expect(json).to include(:title, :iid, :created_at, :total_time, :url, :author)
     end

spec/serializers/analytics_merge_request_serializer_spec.rb

@@ -23,10 +23,6 @@ describe AnalyticsMergeRequestSerializer do
   end
 
   context 'when there is a single object provided' do
-    it 'it generates payload for single object' do
-      expect(json).to be_an_instance_of Hash
-    end
-
     it 'contains important elements of the merge request' do
       expect(json).to include(:title, :iid, :created_at, :total_time, :url, :author, :state)
     end