1 files changed, 73 insertions, 0 deletions
diff --git a/spec/graphql/mutations/projects/star_spec.rb b/spec/graphql/mutations/projects/star_spec.rb
new file mode 100644
index 00000000000..6b1811dcd39
--- /dev/null
+++ b/spec/graphql/mutations/projects/star_spec.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Mutations::Projects::Star, feature_category: :groups_and_projects do
+  describe '#resolve' do
+    let_it_be(:user, freeze: true) { create(:user) }
+
+    subject(:mutation) do
+      described_class
+        .new(object: nil, context: { current_user: user }, field: nil)
+        .resolve(project_id: project.to_global_id, starred: starred)
+    end
+
+    context 'when the user has read access to the project' do
+      let_it_be_with_reload(:project) { create(:project, :public) }
+
+      context 'and the project is not starred' do
+        context 'and the user stars the project' do
+          let(:starred) { true }
+
+          it 'stars the project for the current user' do
+            expect(mutation).to include(count: 1)
+            expect(project.reset.starrers).to include(user)
+          end
+        end
+
+        context 'and the user unstars the project' do
+          let(:starred) { false }
+
+          it 'does not raise an error or change the number of stars' do
+            expect(mutation).to include(count: 0)
+            expect(project.reset.starrers).not_to include(user)
+          end
+        end
+      end
+
+      context 'and the project is starred' do
+        before do
+          user.toggle_star(project)
+        end
+
+        context 'and the user stars the project' do
+          let(:starred) { true }
+
+          it 'does not raise an error or change the number of stars' do
+            expect(mutation).to include(count: 1)
+            expect(project.reset.starrers).to include(user)
+          end
+        end
+
+        context 'and the user unstars the project' do
+          let(:starred) { false }
+
+          it 'unstars the project for the current user' do
+            expect(mutation).to include(count: 0)
+            expect(project.reset.starrers).not_to include(user)
+          end
+        end
+      end
+    end
+
+    context 'when the user does not have read access to the project' do
+      let_it_be(:project, freeze: true) { create(:project, :private) }
+      let(:starred) { true }
+
+      it 'raises an error' do
+        expect { mutation }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+        expect(project.starrers).not_to include(user)
+      end
+    end
+  end
+end