form mailer

test/mailers/form_mailer_test.rb

@@ -0,0 +1,12 @@
+require "test_helper"
+
+class FormMailerTest < ActionMailer::TestCase
+  test "received" do
+    mail = FormMailer.received
+    assert_equal "Received", mail.subject
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["from@example.com"], mail.from
+    assert_match "Hi", mail.body.encoded
+  end
+
+end

test/mailers/previews/form_mailer_preview.rb

@@ -0,0 +1,9 @@
+# Preview all emails at http://localhost:3000/rails/mailers/form_mailer
+class FormMailerPreview < ActionMailer::Preview
+
+  # Preview this email at http://localhost:3000/rails/mailers/form_mailer/received
+  def received
+    FormMailer.received
+  end
+
+end