1 files changed, 47 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/milestone_spec.rb b/spec/requests/api/graphql/milestone_spec.rb
new file mode 100644
index 00000000000..59de116fa2b
--- /dev/null
+++ b/spec/requests/api/graphql/milestone_spec.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Querying a Milestone' do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let_it_be(:project) { create(:project) }
+  let_it_be(:milestone) { create(:milestone, project: project) }
+
+  let(:query) do
+    graphql_query_for('milestone', { id: milestone.to_global_id.to_s }, 'title')
+  end
+
+  subject { graphql_data['milestone'] }
+
+  before do
+    post_graphql(query, current_user: current_user)
+  end
+
+  context 'when the user has access to the milestone' do
+    before_all do
+      project.add_guest(current_user)
+    end
+
+    it_behaves_like 'a working graphql query'
+
+    it { is_expected.to include('title' => milestone.name) }
+  end
+
+  context 'when the user does not have access to the milestone' do
+    it_behaves_like 'a working graphql query'
+
+    it { is_expected.to be_nil }
+  end
+
+  context 'when ID argument is missing' do
+    let(:query) do
+      graphql_query_for('milestone', {}, 'title')
+    end
+
+    it 'raises an exception' do
+      expect(graphql_errors).to include(a_hash_including('message' => "Field 'milestone' is missing required arguments: id"))
+    end
+  end
+end