1 files changed, 59 insertions, 0 deletions
diff --git a/spec/services/packages/update_tags_service_spec.rb b/spec/services/packages/update_tags_service_spec.rb
new file mode 100644
index 00000000000..4a122d1c718
--- /dev/null
+++ b/spec/services/packages/update_tags_service_spec.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Packages::UpdateTagsService do
+  let_it_be(:package, reload: true) { create(:nuget_package) }
+
+  let(:tags) { %w(test-tag tag1 tag2 tag3) }
+  let(:service) { described_class.new(package, tags) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    RSpec.shared_examples 'updating tags' do |tags_count|
+      it 'updates a tag' do
+        expect { subject }.to change { Packages::Tag.count }.by(tags_count)
+        expect(package.reload.tags.map(&:name)).to contain_exactly(*tags)
+      end
+    end
+
+    it_behaves_like 'updating tags', 4
+
+    context 'with an existing tag' do
+      before do
+        create(:packages_tag, package: package2, name: 'test-tag')
+      end
+
+      context 'on the same package' do
+        let_it_be(:package2) { package }
+
+        it_behaves_like 'updating tags', 3
+
+        context 'with different name' do
+          before do
+            create(:packages_tag, package: package2, name: 'to_be_destroyed')
+          end
+
+          it_behaves_like 'updating tags', 2
+        end
+      end
+
+      context 'on a different package' do
+        let_it_be(:package2) { create(:nuget_package) }
+
+        it_behaves_like 'updating tags', 4
+      end
+    end
+
+    context 'with empty tags' do
+      let(:tags) { [] }
+
+      it 'is a no op' do
+        expect(package).not_to receive(:tags)
+        expect(::Gitlab::Database).not_to receive(:bulk_insert)
+
+        subject
+      end
+    end
+  end
+end