RSpec.describe AppMailer, type: :mailer do

  before(:all) do
    Archive::Zip.archive(
      "tmp/app.zip",
      "README.md")
  end

  after(:all) do
    FileUtils.rm "tmp/app.zip"
  end

  let(:mail) do
    AppMailer.send_email(zip_path)
  end

  it 'assings the attachment file' do
    attachment = mail.attachments[0]
    expect(attachment).to be_a_kind_of(Mail::Part)
    expect(attachment.content_type).to be_start_with('application/zip')
    expect(attachment.filename).to eq "app.zip"
  end
end