1 files changed, 45 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/mutations/branches/create_spec.rb b/spec/requests/api/graphql/mutations/branches/create_spec.rb
new file mode 100644
index 00000000000..b3c378ec2bc
--- /dev/null
+++ b/spec/requests/api/graphql/mutations/branches/create_spec.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Creation of a new branch' do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let_it_be(:project) { create(:project, :public, :empty_repo) }
+  let(:input) { { project_path: project.full_path, name: new_branch, ref: ref } }
+  let(:new_branch) { 'new_branch' }
+  let(:ref) { 'master' }
+
+  let(:mutation) { graphql_mutation(:create_branch, input) }
+  let(:mutation_response) { graphql_mutation_response(:create_branch) }
+
+  context 'the user is not allowed to create a branch' do
+    it_behaves_like 'a mutation that returns top-level errors',
+      errors: ['The resource that you are attempting to access does not exist or you don\'t have permission to perform this action']
+  end
+
+  context 'when user has permissions to create a branch' do
+    before do
+      project.add_developer(current_user)
+    end
+
+    it 'creates a new branch' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response['branch']).to include(
+        'name' => new_branch,
+        'commit' => a_hash_including('id')
+      )
+    end
+
+    context 'when ref is not correct' do
+      let(:new_branch) { 'another_branch' }
+      let(:ref) { 'unknown' }
+
+      it_behaves_like 'a mutation that returns errors in the response',
+                      errors: ['Invalid reference name: unknown']
+    end
+  end
+end