1 files changed, 105 insertions, 0 deletions
diff --git a/spec/finders/design_management/designs_finder_spec.rb b/spec/finders/design_management/designs_finder_spec.rb
new file mode 100644
index 00000000000..04bd0ad0a45
--- /dev/null
+++ b/spec/finders/design_management/designs_finder_spec.rb
@@ -0,0 +1,105 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe DesignManagement::DesignsFinder do
+  include DesignManagementTestHelpers
+
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project, :private) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let_it_be(:design1) { create(:design, :with_file, issue: issue, versions_count: 1) }
+  let_it_be(:design2) { create(:design, :with_file, issue: issue, versions_count: 1) }
+  let_it_be(:design3) { create(:design, :with_file, issue: issue, versions_count: 1) }
+  let(:params) { {} }
+
+  subject(:designs) { described_class.new(issue, user, params).execute }
+
+  describe '#execute' do
+    context 'when user can not read designs of an issue' do
+      it 'returns no results' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when user can read designs of an issue' do
+      before do
+        project.add_developer(user)
+      end
+
+      context 'when design management feature is disabled' do
+        it 'returns no results' do
+          is_expected.to be_empty
+        end
+      end
+
+      context 'when design management feature is enabled' do
+        before do
+          enable_design_management
+        end
+
+        it 'returns the designs' do
+          is_expected.to contain_exactly(design1, design2, design3)
+        end
+
+        context 'when argument is the ids of designs' do
+          let(:params) { { ids: [design1.id] } }
+
+          it { is_expected.to eq([design1]) }
+        end
+
+        context 'when argument is the filenames of designs' do
+          let(:params) { { filenames: [design2.filename] } }
+
+          it { is_expected.to eq([design2]) }
+        end
+
+        context 'when passed empty array' do
+          context 'for filenames' do
+            let(:params) { { filenames: [] } }
+
+            it { is_expected.to be_empty }
+          end
+
+          context "for ids" do
+            let(:params) { { ids: [] } }
+
+            it { is_expected.to be_empty }
+          end
+        end
+
+        describe 'returning designs that existed at a particular given version' do
+          let(:all_versions) { issue.design_collection.versions.ordered }
+          let(:first_version) { all_versions.last }
+          let(:second_version) { all_versions.second }
+
+          context 'when argument is the first version' do
+            let(:params) { { visible_at_version: first_version } }
+
+            it { is_expected.to eq([design1]) }
+          end
+
+          context 'when arguments are version and id' do
+            context 'when id is absent at version' do
+              let(:params) { { visible_at_version: first_version, ids: [design2.id] } }
+
+              it { is_expected.to eq([]) }
+            end
+
+            context 'when id is present at version' do
+              let(:params) { { visible_at_version: second_version, ids: [design2.id] } }
+
+              it { is_expected.to eq([design2]) }
+            end
+          end
+
+          context 'when argument is the second version' do
+            let(:params) { { visible_at_version: second_version } }
+
+            it { is_expected.to contain_exactly(design1, design2) }
+          end
+        end
+      end
+    end
+  end
+end