start on news mailer

test/mailers/news_mailer_test.rb

@@ -0,0 +1,28 @@
+require "test_helper"
+
+class NewsMailerTest < ActionMailer::TestCase
+  test "letter" do
+    mail = NewsMailer.letter
+    assert_equal "Letter", mail.subject
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["from@example.com"], mail.from
+    assert_match "Hi", mail.body.encoded
+  end
+
+  test "subscribed" do
+    mail = NewsMailer.subscribed
+    assert_equal "Subscribed", mail.subject
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["from@example.com"], mail.from
+    assert_match "Hi", mail.body.encoded
+  end
+
+  test "unsubscribed" do
+    mail = NewsMailer.unsubscribed
+    assert_equal "Unsubscribed", 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

@@ -3,7 +3,7 @@ class FormMailerPreview < ActionMailer::Preview
 
   # Preview this email at http://localhost:3000/rails/mailers/form_mailer/received
   def received
-    FormMailer.received
+    FormMailer.received name: "Me" , email: "You"
   end
 
 end

test/mailers/previews/news_mailer_preview.rb

@@ -0,0 +1,7 @@
+class NewsMailerPreview < ActionMailer::Preview
+
+  def letter
+    NewsMailer.letter
+  end
+
+end