gitlab-ce/doc/development/testing_guide/testing_rake_tasks.md

Testing Rake tasks

To make testing Rake tasks a little easier, there is a helper that can be included in lieu of the standard Spec helper. Instead of require 'spec_helper', use require 'rake_helper'. The helper includes spec_helper for you, and configures a few other things to make testing Rake tasks easier.

At a minimum, requiring the Rake helper will redirect stdout, include the runtime task helpers, and include the RakeHelpers Spec support module.

The RakeHelpers module exposes a run_rake_task(<task>) method to make executing tasks simple. See spec/support/helpers/rake_helpers.rb for all available methods.

Example:

require 'rake_helper'

describe 'gitlab:shell rake tasks' do
  before do
    Rake.application.rake_require 'tasks/gitlab/shell'

    stub_warn_user_is_not_gitlab
  end

 describe 'install task' do
    it 'invokes create_hooks task' do
      expect(Rake::Task['gitlab:shell:create_hooks']).to receive(:invoke)

      run_rake_task('gitlab:shell:install')
    end
  end
end

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