# 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
