RSpec.describe ApplicationMailer, type: :mailer do describe 'dealing with invalid emails' do let(:dossier) { create(:dossier, procedure: create(:simple_procedure)) } subject { DossierMailer.with(dossier:).notify_new_draft } describe 'invalid emails are not sent' do before do allow_any_instance_of(DossierMailer) .to receive(:notify_new_draft) .and_raise(smtp_error) end context 'when the server handles invalid emails with Net::SMTPSyntaxError' do let(:smtp_error) { Net::SMTPSyntaxError.new } it { expect(subject.message).to be_an_instance_of(ActionMailer::Base::NullMail) } end context 'when the server handles invalid emails with Net::SMTPServerBusy' do let(:smtp_error) { Net::SMTPServerBusy.new('400 unexpected recipients: want atleast 1, got 0') } it { expect(subject.message).to be_an_instance_of(ActionMailer::Base::NullMail) } end end describe 'valid emails are sent' do it { expect(subject.message).not_to be_an_instance_of(ActionMailer::Base::NullMail) } end end end