Fix CI specs

app/uploaders/object_store_uploader.rb

 require 'fog/aws'
 require 'carrierwave/storage/fog'
 
-class ObjectStoreUploader < GitlabUploader
+class ObjectStoreUploader < CarrierWave::Uploader::Base
   before :store, :set_default_local_store
   before :store, :verify_license!
 
@@ -29,6 +29,14 @@ class ObjectStoreUploader < GitlabUploader
     @field = field
   end
 
+  def file_storage?
+    storage.is_a?(CarrierWave::Storage::File)
+  end
+
+  def file_cache_storage?
+    cache_storage.is_a?(CarrierWave::Storage::File)
+  end
+
   def object_store
     subject.public_send(:"#{field}_store")
   end
@@ -112,6 +120,10 @@ class ObjectStoreUploader < GitlabUploader
     raise 'Object Storage feature is missing' unless subject.project.feature_available?(:object_storage)
   end
 
+  def exists?
+    file.try(:exists?)
+  end
+
   private
 
   def set_default_local_store(new_file)

spec/uploaders/object_store_uploader_spec.rb

@@ -22,6 +22,42 @@ describe ObjectStoreUploader do
     end
   end
 
+  describe '#file_storage?' do
+    context 'when file storage is used' do
+      before do
+        uploader_class.storage(:file)
+      end
+
+      it { is_expected.to be_file_storage }
+    end
+
+    context 'when is remote storage' do
+      before do
+        uploader_class.storage(:fog)
+      end
+
+      it { is_expected.not_to be_file_storage }
+    end
+  end
+
+  describe '#file_cache_storage?' do
+    context 'when file storage is used' do
+      before do
+        uploader_class.cache_storage(:file)
+      end
+
+      it { is_expected.to be_file_cache_storage }
+    end
+
+    context 'when is remote storage' do
+      before do
+        uploader_class.cache_storage(:fog)
+      end
+
+      it { is_expected.not_to be_file_cache_storage }
+    end
+  end
+
   context 'when using ArtifactsUploader' do
     let(:job) { create(:ci_build, :artifacts, artifacts_file_store: store) }
     let(:uploader) { job.artifacts_file }