Write first test case for calling simple mailer method with deliver_later

Author: Joel Lubrano

spec/rspec/rails/matchers/have_enqueued_mail_spec.rb

@@ -0,0 +1,26 @@
+require "spec_helper"
+require "rspec/rails/feature_check"
+
+if RSpec::Rails::FeatureCheck.has_active_job?
+  require "action_mailer"
+  require "rspec/rails/matchers/have_enqueued_mail"
+
+  class TestMailer < ActionMailer::Base
+    def test_email; end
+    def email_with_args(arg1, arg2); end
+  end
+end
+
+RSpec.describe "HaveEnqueuedMail matchers", skip: !RSpec::Rails::FeatureCheck.has_active_job? do
+  before do
+    ActiveJob::Base.queue_adapter = :test
+  end
+
+  describe "have_enqueued_mail" do
+    it "passes when a mailer method is called with deliver_later" do
+      expect {
+        TestMailer.test_email.deliver_later
+      }.to have_enqueued_mail(TestMailer, :test_email)
+    end
+  end
+end