Add specs for API::Helpers::GraphqlHelpers

spec/lib/api/helpers/graphql_helpers_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::Helpers::GraphqlHelpers do
+  describe 'run_graphql!' do
+    let(:query) { '{ metadata { version } }' }
+
+    let(:graphql_helper) do
+      Class.new do
+        include API::Helpers::GraphqlHelpers
+      end.new
+    end
+
+    context 'when transform function is provided' do
+      let(:result) { { 'data' => { 'metadata' => { 'version' => '1.0.0' } } } }
+
+      before do
+        allow(GitlabSchema).to receive(:execute).and_return(result)
+      end
+
+      it 'returns the expected result' do
+        expect(
+          graphql_helper.run_graphql!(
+            query: query,
+            transform: ->(result) { result.dig('data', 'metadata') }
+          )
+        ).to eq({ 'version' => '1.0.0' })
+      end
+    end
+
+    context 'when a transform function is not provided' do
+      let(:result) { double('result') }
+
+      before do
+        allow(GitlabSchema).to receive(:execute).and_return(result)
+      end
+
+      it 'returns the expected result' do
+        expect(graphql_helper.run_graphql!(query: query)).to eq(result)
+      end
+    end
+  end
+end