1 files changed, 51 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/mutations/merge_requests/create_spec.rb b/spec/requests/api/graphql/mutations/merge_requests/create_spec.rb
new file mode 100644
index 00000000000..5c63f655f1d
--- /dev/null
+++ b/spec/requests/api/graphql/mutations/merge_requests/create_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Creation of a new merge request' do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let(:project) { create(:project, :public, :repository) }
+  let(:input) do
+    {
+      project_path: project.full_path,
+      title: title,
+      source_branch: source_branch,
+      target_branch: target_branch
+    }
+  end
+  let(:title) { 'MergeRequest' }
+  let(:source_branch) { 'new_branch' }
+  let(:target_branch) { 'master' }
+
+  let(:mutation) { graphql_mutation(:merge_request_create, input) }
+  let(:mutation_response) { graphql_mutation_response(:merge_request_create) }
+
+  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 merge request' do
+    before do
+      project.add_developer(current_user)
+    end
+
+    it 'creates a new merge request' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response['mergeRequest']).to include(
+        'title' => title
+      )
+    end
+
+    context 'when source branch is equal to the target branch' do
+      let(:source_branch) { target_branch }
+
+      it_behaves_like 'a mutation that returns errors in the response',
+        errors: ['Branch conflict You can\'t use same project/branch for source and target']
+    end
+  end
+end