rails--rails/actionmailer/test/base_test.rb

# frozen_string_literal: true

require "abstract_unit"
require "set"

require "action_dispatch"
require "active_support/time"

require "mailers/base_mailer"
require "mailers/proc_mailer"
require "mailers/asset_mailer"

class BaseTest < ActiveSupport::TestCase
  include Rails::Dom::Testing::Assertions::DomAssertions

  setup do
    @original_delivery_method = ActionMailer::Base.delivery_method
    ActionMailer::Base.delivery_method = :test
    @original_asset_host = ActionMailer::Base.asset_host
    @original_assets_dir = ActionMailer::Base.assets_dir
  end

  teardown do
    ActionMailer::Base.asset_host = @original_asset_host
    ActionMailer::Base.assets_dir = @original_assets_dir
    BaseMailer.deliveries.clear
    ActionMailer::Base.delivery_method = @original_delivery_method
  end

  test "method call to mail does not raise error" do
    assert_nothing_raised { BaseMailer.welcome }
  end

  # Basic mail usage without block
  test "mail() should set the headers of the mail message" do
    email = BaseMailer.welcome
    assert_equal(["system@test.lindsaar.net"],    email.to)
    assert_equal(["jose@test.plataformatec.com"], email.from)
    assert_equal("The first email on new API!",   email.subject)
  end

  test "mail() with from overwrites the class level default" do
    email = BaseMailer.welcome(from: "someone@example.com",
                               to:   "another@example.org")
    assert_equal(["someone@example.com"], email.from)
    assert_equal(["another@example.org"], email.to)
  end

  test "mail() with bcc, cc, content_type, charset, mime_version, reply_to and date" do
    time  = Time.now.beginning_of_day.to_datetime
    email = BaseMailer.welcome(bcc: "bcc@test.lindsaar.net",
                               cc: "cc@test.lindsaar.net",
                               content_type: "multipart/mixed",
                               charset: "iso-8559-1",
                               mime_version: "2.0",
                               reply_to: "reply-to@test.lindsaar.net",
                               date: time)
    assert_equal(["bcc@test.lindsaar.net"],             email.bcc)
    assert_equal(["cc@test.lindsaar.net"],              email.cc)
    assert_equal("multipart/mixed; charset=iso-8559-1", email.content_type)
    assert_equal("iso-8559-1",                          email.charset)
    assert_equal("2.0",                                 email.mime_version)
    assert_equal(["reply-to@test.lindsaar.net"],        email.reply_to)
    assert_equal(time,                                  email.date)
  end

  test "mail() renders the template using the method being processed" do
    email = BaseMailer.welcome
    assert_equal("Welcome", email.body.encoded)
  end

  test "can pass in :body to the mail method hash" do
    email = BaseMailer.welcome(body: "Hello there")
    assert_equal("text/plain", email.mime_type)
    assert_equal("Hello there", email.body.encoded)
  end

  test "should set template content type if mail has only one part" do
    mail = BaseMailer.html_only
    assert_equal("text/html", mail.mime_type)
    mail = BaseMailer.plain_text_only
    assert_equal("text/plain", mail.mime_type)
  end

  # Custom headers
  test "custom headers" do
    email = BaseMailer.welcome
    assert_equal("Not SPAM", email["X-SPAM"].decoded)
  end

  test "can pass random headers in as a hash to mail" do
    hash = { "X-Special-Domain-Specific-Header" => "SecretValue",
            "In-Reply-To" => "1234@mikel.me.com" }
    mail = BaseMailer.welcome(hash)
    assert_equal("SecretValue", mail["X-Special-Domain-Specific-Header"].decoded)
    assert_equal("1234@mikel.me.com", mail["In-Reply-To"].decoded)
  end

  test "can pass random headers in as a hash to headers" do
    hash = { "X-Special-Domain-Specific-Header" => "SecretValue",
            "In-Reply-To" => "1234@mikel.me.com" }
    mail = BaseMailer.welcome_with_headers(hash)
    assert_equal("SecretValue", mail["X-Special-Domain-Specific-Header"].decoded)
    assert_equal("1234@mikel.me.com", mail["In-Reply-To"].decoded)
  end

  # Attachments
  test "attachment with content" do
    email = BaseMailer.attachment_with_content
    assert_equal(1, email.attachments.length)
    assert_equal("invoice.pdf", email.attachments[0].filename)
    assert_equal("This is test File content", email.attachments["invoice.pdf"].decoded)
  end

  test "attachment gets content type from filename" do
    email = BaseMailer.attachment_with_content
    assert_equal("invoice.pdf", email.attachments[0].filename)
    assert_equal("application/pdf", email.attachments[0].mime_type)
  end

  test "attachment with hash" do
    email = BaseMailer.attachment_with_hash
    assert_equal(1, email.attachments.length)
    assert_equal("invoice.jpg", email.attachments[0].filename)
    expected = +"\312\213\254\232)b"
    expected.force_encoding(Encoding::BINARY)
    assert_equal expected, email.attachments["invoice.jpg"].decoded
  end

  test "attachment with hash using default mail encoding" do
    email = BaseMailer.attachment_with_hash_default_encoding
    assert_equal(1, email.attachments.length)
    assert_equal("invoice.jpg", email.attachments[0].filename)
    expected = +"\312\213\254\232)b"
    expected.force_encoding(Encoding::BINARY)
    assert_equal expected, email.attachments["invoice.jpg"].decoded
  end

  test "sets mime type to multipart/mixed when attachment is included" do
    email = BaseMailer.attachment_with_content
    assert_equal(1, email.attachments.length)
    assert_equal("multipart/mixed", email.mime_type)
  end

  test "set mime type to text/html when attachment is included and body is set" do
    email = BaseMailer.attachment_with_content(body: "Hello there", content_type: "text/html")
    assert_equal("text/html", email.mime_type)
  end

  test "adds the rendered template as part" do
    email = BaseMailer.attachment_with_content
    assert_equal(2, email.parts.length)
    assert_equal("multipart/mixed", email.mime_type)
    assert_equal("text/html", email.parts[0].mime_type)
    assert_equal("Attachment with content", email.parts[0].decoded)
    assert_equal("application/pdf", email.parts[1].mime_type)
    assert_equal("This is test File content", email.parts[1].decoded)
  end

  test "adds the given :body as part" do
    email = BaseMailer.attachment_with_content(body: "I'm the eggman")
    assert_equal(2, email.parts.length)
    assert_equal("multipart/mixed", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("I'm the eggman", email.parts[0].decoded)
    assert_equal("application/pdf", email.parts[1].mime_type)
    assert_equal("This is test File content", email.parts[1].decoded)
  end

  test "can embed an inline attachment" do
    email = BaseMailer.inline_attachment
    # Need to call #encoded to force the JIT sort on parts
    email.encoded
    assert_equal(2, email.parts.length)
    assert_equal("multipart/related", email.mime_type)
    assert_equal("multipart/alternative", email.parts[0].mime_type)
    assert_equal("text/plain", email.parts[0].parts[0].mime_type)
    assert_equal("text/html",  email.parts[0].parts[1].mime_type)
    assert_equal("logo.png", email.parts[1].filename)
  end

  # Defaults values
  test "uses default charset from class" do
    with_default BaseMailer, charset: "US-ASCII" do
      email = BaseMailer.welcome
      assert_equal("US-ASCII", email.charset)

      email = BaseMailer.welcome(charset: "iso-8559-1")
      assert_equal("iso-8559-1", email.charset)
    end
  end

  test "uses default content type from class" do
    with_default BaseMailer, content_type: "text/html" do
      email = BaseMailer.welcome
      assert_equal("text/html", email.mime_type)

      email = BaseMailer.welcome(content_type: "text/plain")
      assert_equal("text/plain", email.mime_type)
    end
  end

  test "uses default mime version from class" do
    with_default BaseMailer, mime_version: "2.0" do
      email = BaseMailer.welcome
      assert_equal("2.0", email.mime_version)

      email = BaseMailer.welcome(mime_version: "1.0")
      assert_equal("1.0", email.mime_version)
    end
  end

  test "uses random default headers from class" do
    with_default BaseMailer, "X-Custom" => "Custom" do
      email = BaseMailer.welcome
      assert_equal("Custom", email["X-Custom"].decoded)
    end
  end

  test "subject gets default from I18n" do
    with_default BaseMailer, subject: nil do
      email = BaseMailer.welcome(subject: nil)
      assert_equal "Welcome", email.subject

      with_translation "en", base_mailer: { welcome: { subject: "New Subject!" } } do
        email = BaseMailer.welcome(subject: nil)
        assert_equal "New Subject!", email.subject
      end
    end
  end

  test "default subject can have interpolations" do
    with_translation "en", base_mailer: { with_subject_interpolations: { subject: "Will the real %{rapper_or_impersonator} please stand up?" } } do
      email = BaseMailer.with_subject_interpolations
      assert_equal "Will the real Slim Shady please stand up?", email.subject
    end
  end

  test "translations are scoped properly" do
    with_translation "en", base_mailer: { email_with_translations: { greet_user: "Hello %{name}!" } } do
      email = BaseMailer.email_with_translations
      assert_equal "Hello lifo!", email.body.encoded
    end
  end

  test "adding attachments after mail was called raises exception" do
    class LateAttachmentMailer < ActionMailer::Base
      def welcome
        mail body: "yay", from: "welcome@example.com", to: "to@example.com"
        attachments["invoice.pdf"] = "This is test File content"
      end
    end

    e = assert_raises(RuntimeError) { LateAttachmentMailer.welcome.message }
    assert_match(/Can't add attachments after `mail` was called./, e.message)
  end

  test "adding inline attachments after mail was called raises exception" do
    class LateInlineAttachmentMailer < ActionMailer::Base
      def welcome
        mail body: "yay", from: "welcome@example.com", to: "to@example.com"
        attachments.inline["invoice.pdf"] = "This is test File content"
      end
    end

    e = assert_raises(RuntimeError) { LateInlineAttachmentMailer.welcome.message }
    assert_match(/Can't add attachments after `mail` was called./, e.message)
  end

  test "adding inline attachments while rendering mail works" do
    class LateInlineAttachmentMailer < ActionMailer::Base
      def on_render
        mail from: "welcome@example.com", to: "to@example.com"
      end
    end

    mail = LateInlineAttachmentMailer.on_render
    assert_nothing_raised { mail.message }

    assert_equal ["image/jpeg; filename=controller_attachments.jpg",
                  "image/jpeg; filename=attachments.jpg"], mail.attachments.inline.map { |a| a["Content-Type"].to_s }
  end

  test "accessing attachments works after mail was called" do
    class LateAttachmentAccessorMailer < ActionMailer::Base
      def welcome
        attachments["invoice.pdf"] = "This is test File content"
        mail body: "yay", from: "welcome@example.com", to: "to@example.com"

        unless attachments.map(&:filename) == ["invoice.pdf"]
          raise Minitest::Assertion, "Should allow access to attachments"
        end
      end
    end

    assert_nothing_raised { LateAttachmentAccessorMailer.welcome.message }
  end

  # Implicit multipart
  test "implicit multipart" do
    email = BaseMailer.implicit_multipart
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("TEXT Implicit Multipart", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("HTML Implicit Multipart", email.parts[1].body.encoded)
  end

  test "implicit multipart with sort order" do
    order = ["text/html", "text/plain"]
    with_default BaseMailer, parts_order: order do
      email = BaseMailer.implicit_multipart
      assert_equal("text/html",  email.parts[0].mime_type)
      assert_equal("text/plain", email.parts[1].mime_type)

      email = BaseMailer.implicit_multipart(parts_order: order.reverse)
      assert_equal("text/plain", email.parts[0].mime_type)
      assert_equal("text/html",  email.parts[1].mime_type)
    end
  end

  test "implicit multipart with attachments creates nested parts" do
    email = BaseMailer.implicit_multipart(attachments: true)
    assert_equal(%w[ application/pdf multipart/alternative ], email.parts.map(&:mime_type).sort)
    multipart = email.parts.detect { |p| p.mime_type == "multipart/alternative" }
    assert_equal("text/plain", multipart.parts[0].mime_type)
    assert_equal("TEXT Implicit Multipart", multipart.parts[0].body.encoded)
    assert_equal("text/html", multipart.parts[1].mime_type)
    assert_equal("HTML Implicit Multipart", multipart.parts[1].body.encoded)
  end

  test "implicit multipart with attachments and sort order" do
    order = ["text/html", "text/plain"]
    with_default BaseMailer, parts_order: order do
      email = BaseMailer.implicit_multipart(attachments: true)
      assert_equal(%w[ application/pdf multipart/alternative ], email.parts.map(&:mime_type).sort)
      multipart = email.parts.detect { |p| p.mime_type == "multipart/alternative" }
      assert_equal(%w[ text/html text/plain ], multipart.parts.map(&:mime_type).sort)
    end
  end

  test "implicit multipart with default locale" do
    email = BaseMailer.implicit_with_locale
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("Implicit with locale TEXT", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("Implicit with locale EN HTML", email.parts[1].body.encoded)
  end

  test "implicit multipart with other locale" do
    swap I18n, locale: :pl do
      email = BaseMailer.implicit_with_locale
      assert_equal(2, email.parts.size)
      assert_equal("multipart/alternative", email.mime_type)
      assert_equal("text/plain", email.parts[0].mime_type)
      assert_equal("Implicit with locale PL TEXT", email.parts[0].body.encoded)
      assert_equal("text/html", email.parts[1].mime_type)
      assert_equal("Implicit with locale EN HTML", email.parts[1].body.encoded)
    end
  end

  test "implicit multipart with fallback locale" do
    fallback_backend = Class.new(I18n::Backend::Simple) do
      include I18n::Backend::Fallbacks
    end

    begin
      backend = I18n.backend
      I18n.backend = fallback_backend.new
      I18n.fallbacks[:"de-AT"] = [:de]

      swap I18n, locale: "de-AT" do
        email = BaseMailer.implicit_with_locale
        assert_equal(2, email.parts.size)
        assert_equal("multipart/alternative", email.mime_type)
        assert_equal("text/plain", email.parts[0].mime_type)
        assert_equal("Implicit with locale DE-AT TEXT", email.parts[0].body.encoded)
        assert_equal("text/html", email.parts[1].mime_type)
        assert_equal("Implicit with locale DE HTML", email.parts[1].body.encoded)
      end
    ensure
      I18n.backend = backend
    end
  end

  test "implicit multipart with several view paths uses the first one with template" do
    old = BaseMailer.view_paths
    begin
      BaseMailer.view_paths = [File.join(FIXTURE_LOAD_PATH, "another.path")] + old.dup
      email = BaseMailer.welcome
      assert_equal("Welcome from another path", email.body.encoded)
    ensure
      BaseMailer.view_paths = old
    end
  end

  test "implicit multipart with inexistent templates uses the next view path" do
    old = BaseMailer.view_paths
    begin
      BaseMailer.view_paths = [File.join(FIXTURE_LOAD_PATH, "unknown")] + old.dup
      email = BaseMailer.welcome
      assert_equal("Welcome", email.body.encoded)
    ensure
      BaseMailer.view_paths = old
    end
  end

  # Explicit multipart
  test "explicit multipart" do
    email = BaseMailer.explicit_multipart
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("TEXT Explicit Multipart", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("HTML Explicit Multipart", email.parts[1].body.encoded)
  end

  test "explicit multipart have a boundary" do
    mail = BaseMailer.explicit_multipart
    assert_not_nil(mail.content_type_parameters[:boundary])
  end

  test "explicit multipart with attachments creates nested parts" do
    email = BaseMailer.explicit_multipart(attachments: true)
    assert_equal(%w[ application/pdf multipart/alternative ], email.parts.map(&:mime_type).sort)
    multipart = email.parts.detect { |p| p.mime_type == "multipart/alternative" }
    assert_equal("text/plain", multipart.parts[0].mime_type)
    assert_equal("TEXT Explicit Multipart", multipart.parts[0].body.encoded)
    assert_equal("text/html", multipart.parts[1].mime_type)
    assert_equal("HTML Explicit Multipart", multipart.parts[1].body.encoded)
  end

  test "explicit multipart with templates" do
    email = BaseMailer.explicit_multipart_templates
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("TEXT Explicit Multipart Templates", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("HTML Explicit Multipart Templates", email.parts[1].body.encoded)
  end

  test "explicit multipart with format.any" do
    email = BaseMailer.explicit_multipart_with_any
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("Format with any!", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("Format with any!", email.parts[1].body.encoded)
  end

  test "explicit without specifying format with format.any" do
    error = assert_raises(ArgumentError) do
      BaseMailer.explicit_without_specifying_format_with_any.parts
    end
    assert_equal "You have to supply at least one format", error.message
  end

  test "explicit multipart with format(Hash)" do
    email = BaseMailer.explicit_multipart_with_options(true)
    email.ready_to_send!
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("base64", email.parts[0].content_transfer_encoding)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("7bit", email.parts[1].content_transfer_encoding)
  end

  test "explicit multipart with one part is rendered as body and options are merged" do
    email = BaseMailer.explicit_multipart_with_options
    assert_equal(0, email.parts.size)
    assert_equal("text/plain", email.mime_type)
    assert_equal("base64", email.content_transfer_encoding)
  end

  test "explicit multipart with one template has the expected format" do
    email = BaseMailer.explicit_multipart_with_one_template
    assert_equal(2, email.parts.size)
    assert_equal("multipart/alternative", email.mime_type)
    assert_equal("text/plain", email.parts[0].mime_type)
    assert_equal("[:text]", email.parts[0].body.encoded)
    assert_equal("text/html", email.parts[1].mime_type)
    assert_equal("[:html]", email.parts[1].body.encoded)
  end

  test "explicit multipart with sort order" do
    order = ["text/html", "text/plain"]
    with_default BaseMailer, parts_order: order do
      email = BaseMailer.explicit_multipart
      assert_equal("text/html",  email.parts[0].mime_type)
      assert_equal("text/plain", email.parts[1].mime_type)

      email = BaseMailer.explicit_multipart(parts_order: order.reverse)
      assert_equal("text/plain", email.parts[0].mime_type)
      assert_equal("text/html",  email.parts[1].mime_type)
    end
  end

  # Class level API with method missing
  test "should respond to action methods" do
    assert_respond_to BaseMailer, :welcome
    assert_respond_to BaseMailer, :implicit_multipart
    assert_not_respond_to BaseMailer, :mail
    assert_not_respond_to BaseMailer, :headers
  end

  test "calling just the action should return the generated mail object" do
    email = BaseMailer.welcome
    assert_equal(0, BaseMailer.deliveries.length)
    assert_equal("The first email on new API!", email.subject)
  end

  test "calling deliver on the action should deliver the mail object" do
    assert_called(BaseMailer, :deliver_mail) do
      mail = BaseMailer.welcome.deliver_now
      assert_equal "The first email on new API!", mail.subject
    end
  end

  test "calling deliver on the action should increment the deliveries collection if using the test mailer" do
    BaseMailer.welcome.deliver_now
    assert_equal(1, BaseMailer.deliveries.length)
  end

  test "calling deliver, ActionMailer should yield back to mail to let it call :do_delivery on itself" do
    mail = Mail::Message.new
    assert_called(mail, :do_delivery) do
      assert_called(BaseMailer, :welcome, returns: mail) do
        BaseMailer.welcome.deliver
      end
    end
  end

  # Rendering
  test "you can specify a different template for implicit render" do
    mail = BaseMailer.implicit_different_template("implicit_multipart").deliver_now
    assert_equal("HTML Implicit Multipart", mail.html_part.body.decoded)
    assert_equal("TEXT Implicit Multipart", mail.text_part.body.decoded)
  end

  test "should raise if missing template in implicit render" do
    assert_raises ActionView::MissingTemplate do
      BaseMailer.implicit_different_template("missing_template").deliver_now
    end
    assert_equal(0, BaseMailer.deliveries.length)
  end

  test "you can specify a different template for explicit render" do
    mail = BaseMailer.explicit_different_template("explicit_multipart_templates").deliver_now
    assert_equal("HTML Explicit Multipart Templates", mail.html_part.body.decoded)
    assert_equal("TEXT Explicit Multipart Templates", mail.text_part.body.decoded)
  end

  test "you can specify a different layout" do
    mail = BaseMailer.different_layout("different_layout").deliver_now
    assert_equal("HTML -- HTML", mail.html_part.body.decoded)
    assert_equal("PLAIN -- PLAIN", mail.text_part.body.decoded)
  end

  test "you can specify the template path for implicit lookup" do
    mail = BaseMailer.welcome_from_another_path("another.path/base_mailer").deliver_now
    assert_equal("Welcome from another path", mail.body.encoded)

    mail = BaseMailer.welcome_from_another_path(["unknown/invalid", "another.path/base_mailer"]).deliver_now
    assert_equal("Welcome from another path", mail.body.encoded)
  end

  test "assets tags should use ActionMailer's asset_host settings" do
    ActionMailer::Base.config.asset_host = "http://global.com"
    ActionMailer::Base.config.assets_dir = "global/"

    mail = AssetMailer.welcome

    assert_dom_equal(%{<img src="http://global.com/images/dummy.png" />}, mail.body.to_s.strip)
  end

  test "assets tags should use a Mailer's asset_host settings when available" do
    ActionMailer::Base.config.asset_host = "http://global.com"
    ActionMailer::Base.config.assets_dir = "global/"

    TempAssetMailer = Class.new(AssetMailer) do
      self.mailer_name = "asset_mailer"
      self.asset_host = "http://local.com"
    end

    mail = TempAssetMailer.welcome

    assert_dom_equal(%{<img src="http://local.com/images/dummy.png" />}, mail.body.to_s.strip)
  end

  test "the view is not rendered when mail was never called" do
    mail = BaseMailer.without_mail_call
    assert_equal("", mail.body.to_s.strip)
    mail.deliver_now
  end

  test "the return value of mailer methods is not relevant" do
    mail = BaseMailer.with_nil_as_return_value
    assert_equal("Welcome", mail.body.to_s.strip)
    mail.deliver_now
  end

  # Before and After hooks

  class MyObserver
    def self.delivered_email(mail)
    end
  end

  class MySecondObserver
    def self.delivered_email(mail)
    end
  end

  test "you can register and unregister an observer to the mail object that gets informed on email delivery" do
    mail_side_effects do
      ActionMailer::Base.register_observer(MyObserver)
      mail = BaseMailer.welcome
      assert_called_with(MyObserver, :delivered_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_observer(MyObserver)
      assert_not_called(MyObserver, :delivered_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister an observer using its stringified name to the mail object that gets informed on email delivery" do
    mail_side_effects do
      ActionMailer::Base.register_observer("BaseTest::MyObserver")
      mail = BaseMailer.welcome
      assert_called_with(MyObserver, :delivered_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_observer("BaseTest::MyObserver")
      assert_not_called(MyObserver, :delivered_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister an observer using its symbolized underscored name to the mail object that gets informed on email delivery" do
    mail_side_effects do
      ActionMailer::Base.register_observer(:"base_test/my_observer")
      mail = BaseMailer.welcome
      assert_called_with(MyObserver, :delivered_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_observer(:"base_test/my_observer")
      assert_not_called(MyObserver, :delivered_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister multiple observers to the mail object that both get informed on email delivery" do
    mail_side_effects do
      ActionMailer::Base.register_observers("BaseTest::MyObserver", MySecondObserver)
      mail = BaseMailer.welcome
      assert_called_with(MyObserver, :delivered_email, [mail]) do
        assert_called_with(MySecondObserver, :delivered_email, [mail]) do
          mail.deliver_now
        end
      end

      ActionMailer::Base.unregister_observers("BaseTest::MyObserver", MySecondObserver)
      assert_not_called(MyObserver, :delivered_email, returns: mail) do
        mail.deliver_now
      end
      assert_not_called(MySecondObserver, :delivered_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  class MyInterceptor
    def self.delivering_email(mail); end
    def self.previewing_email(mail); end
  end

  class MySecondInterceptor
    def self.delivering_email(mail); end
    def self.previewing_email(mail); end
  end

  test "you can register and unregister an interceptor to the mail object that gets passed the mail object before delivery" do
    mail_side_effects do
      ActionMailer::Base.register_interceptor(MyInterceptor)
      mail = BaseMailer.welcome
      assert_called_with(MyInterceptor, :delivering_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_interceptor(MyInterceptor)
      assert_not_called(MyInterceptor, :delivering_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister an interceptor using its stringified name to the mail object that gets passed the mail object before delivery" do
    mail_side_effects do
      ActionMailer::Base.register_interceptor("BaseTest::MyInterceptor")
      mail = BaseMailer.welcome
      assert_called_with(MyInterceptor, :delivering_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_interceptor("BaseTest::MyInterceptor")
      assert_not_called(MyInterceptor, :delivering_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister an interceptor using its symbolized underscored name to the mail object that gets passed the mail object before delivery" do
    mail_side_effects do
      ActionMailer::Base.register_interceptor(:"base_test/my_interceptor")
      mail = BaseMailer.welcome
      assert_called_with(MyInterceptor, :delivering_email, [mail]) do
        mail.deliver_now
      end

      ActionMailer::Base.unregister_interceptor(:"base_test/my_interceptor")
      assert_not_called(MyInterceptor, :delivering_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "you can register and unregister multiple interceptors to the mail object that both get passed the mail object before delivery" do
    mail_side_effects do
      ActionMailer::Base.register_interceptors("BaseTest::MyInterceptor", MySecondInterceptor)
      mail = BaseMailer.welcome
      assert_called_with(MyInterceptor, :delivering_email, [mail]) do
        assert_called_with(MySecondInterceptor, :delivering_email, [mail]) do
          mail.deliver_now
        end
      end

      ActionMailer::Base.unregister_interceptors("BaseTest::MyInterceptor", MySecondInterceptor)
      assert_not_called(MyInterceptor, :delivering_email, returns: mail) do
        mail.deliver_now
      end
      assert_not_called(MySecondInterceptor, :delivering_email, returns: mail) do
        mail.deliver_now
      end
    end
  end

  test "being able to put proc's into the defaults hash and they get evaluated on mail sending" do
    mail1 = ProcMailer.welcome["X-Proc-Method"]
    yesterday = 1.day.ago
    Time.stub(:now, yesterday) do
      mail2 = ProcMailer.welcome["X-Proc-Method"]
      assert(mail1.to_s.to_i > mail2.to_s.to_i)
    end
  end

  test "default values which have to_proc (e.g. symbols) should not be considered procs" do
    assert(ProcMailer.welcome["x-has-to-proc"].to_s == "symbol")
  end

  test "proc default values can have arity of 1 where arg is a mailer instance" do
    assert_equal(ProcMailer.welcome["X-Lambda-Arity-1-arg"].to_s, "complex_value")
    assert_equal(ProcMailer.welcome["X-Lambda-Arity-1-self"].to_s, "complex_value")
  end

  test "proc default values with fixed arity of 0 can be called" do
    assert_equal("0", ProcMailer.welcome["X-Lambda-Arity-0"].to_s)
  end

  test "we can call other defined methods on the class as needed" do
    mail = ProcMailer.welcome
    assert_equal("Thanks for signing up this afternoon", mail.subject)
  end

  test "modifying the mail message with a before_action" do
    class BeforeActionMailer < ActionMailer::Base
      before_action :add_special_header!

      def welcome ; mail ; end

      private
        def add_special_header!
          headers("X-Special-Header" => "Wow, so special")
        end
    end

    assert_equal("Wow, so special", BeforeActionMailer.welcome["X-Special-Header"].to_s)
  end

  test "modifying the mail message with an after_action" do
    class AfterActionMailer < ActionMailer::Base
      after_action :add_special_header!

      def welcome ; mail ; end

      private
        def add_special_header!
          headers("X-Special-Header" => "Testing")
        end
    end

    assert_equal("Testing", AfterActionMailer.welcome["X-Special-Header"].to_s)
  end

  test "adding an inline attachment using a before_action" do
    class DefaultInlineAttachmentMailer < ActionMailer::Base
      before_action :add_inline_attachment!

      def welcome ; mail ; end

      private
        def add_inline_attachment!
          attachments.inline["footer.jpg"] = "hey there"
        end
    end

    mail = DefaultInlineAttachmentMailer.welcome
    assert_equal("image/jpeg; filename=footer.jpg", mail.attachments.inline.first["Content-Type"].to_s)
  end

  test "action methods should be refreshed after defining new method" do
    class FooMailer < ActionMailer::Base
      # This triggers action_methods.
      respond_to?(:foo)

      def notify
      end
    end

    assert_equal Set.new(["notify"]), FooMailer.action_methods
  end

  test "mailer can be anonymous" do
    mailer = Class.new(ActionMailer::Base) do
      def welcome
        mail
      end
    end

    assert_equal "anonymous", mailer.mailer_name

    assert_equal "Welcome", mailer.welcome.subject
    assert_equal "Anonymous mailer body", mailer.welcome.body.encoded.strip
  end

  test "default_from can be set" do
    class DefaultFromMailer < ActionMailer::Base
      default to: "system@test.lindsaar.net"
      self.default_options = { from: "robert.pankowecki@gmail.com" }

      def welcome
        mail(subject: "subject", body: "hello world")
      end
    end

    assert_equal ["robert.pankowecki@gmail.com"], DefaultFromMailer.welcome.from
  end

  test "mail() without arguments serves as getter for the current mail message" do
    class MailerWithCallback < ActionMailer::Base
      after_action :a_callback

      def welcome
        headers("X-Special-Header" => "special indeed!")
        mail subject: "subject", body: "hello world", to: ["joe@example.com"]
      end

      def a_callback
        mail.to << "jane@example.com"
      end
    end

    mail = MailerWithCallback.welcome
    assert_equal "subject", mail.subject
    assert_equal ["joe@example.com", "jane@example.com"], mail.to
    assert_equal "hello world", mail.body.encoded.strip
    assert_equal "special indeed!", mail["X-Special-Header"].to_s
  end

  test "notification for process" do
    begin
      events = []
      ActiveSupport::Notifications.subscribe("process.action_mailer") do |*args|
        events << ActiveSupport::Notifications::Event.new(*args)
      end

      BaseMailer.welcome(body: "Hello there").deliver_now

      assert_equal 1, events.length
      assert_equal "process.action_mailer", events[0].name
      assert_equal "BaseMailer", events[0].payload[:mailer]
      assert_equal :welcome, events[0].payload[:action]
      assert_equal [{ body: "Hello there" }], events[0].payload[:args]
    ensure
      ActiveSupport::Notifications.unsubscribe "process.action_mailer"
    end
  end

  private

    # Execute the block setting the given values and restoring old values after
    # the block is executed.
    def swap(klass, new_values)
      old_values = {}
      new_values.each do |key, value|
        old_values[key] = klass.send key
        klass.send :"#{key}=", value
      end
      yield
    ensure
      old_values.each do |key, value|
        klass.send :"#{key}=", value
      end
    end

    def with_default(klass, new_values)
      old = klass.default_params
      klass.default(new_values)
      yield
    ensure
      klass.default_params = old
    end

    def mail_side_effects
      old_observers = Mail.class_variable_get(:@@delivery_notification_observers)
      old_delivery_interceptors = Mail.class_variable_get(:@@delivery_interceptors)
      yield
    ensure
      Mail.class_variable_set(:@@delivery_notification_observers, old_observers)
      Mail.class_variable_set(:@@delivery_interceptors, old_delivery_interceptors)
    end

    def with_translation(locale, data)
      I18n.backend.store_translations(locale, data)
      yield
    ensure
      I18n.backend.reload!
    end
end

class BasePreviewInterceptorsTest < ActiveSupport::TestCase
  teardown do
    ActionMailer::Base.preview_interceptors.clear
  end

  class BaseMailerPreview < ActionMailer::Preview
    def welcome
      BaseMailer.welcome
    end
  end

  class MyInterceptor
    def self.delivering_email(mail); end
    def self.previewing_email(mail); end
  end

  class MySecondInterceptor
    def self.delivering_email(mail); end
    def self.previewing_email(mail); end
  end

  test "you can register and unregister a preview interceptor to the mail object that gets passed the mail object before previewing" do
    ActionMailer::Base.register_preview_interceptor(MyInterceptor)
    mail = BaseMailer.welcome
    stub_any_instance(BaseMailerPreview) do |instance|
      instance.stub(:welcome, mail) do
        assert_called_with(MyInterceptor, :previewing_email, [mail]) do
          BaseMailerPreview.call(:welcome)
        end
      end
    end

    ActionMailer::Base.unregister_preview_interceptor(MyInterceptor)
    assert_not_called(MyInterceptor, :previewing_email, returns: mail) do
      BaseMailerPreview.call(:welcome)
    end
  end

  test "you can register and unregister a preview interceptor using its stringified name to the mail object that gets passed the mail object before previewing" do
    ActionMailer::Base.register_preview_interceptor("BasePreviewInterceptorsTest::MyInterceptor")
    mail = BaseMailer.welcome
    stub_any_instance(BaseMailerPreview) do |instance|
      instance.stub(:welcome, mail) do
        assert_called_with(MyInterceptor, :previewing_email, [mail]) do
          BaseMailerPreview.call(:welcome)
        end
      end
    end

    ActionMailer::Base.unregister_preview_interceptor("BasePreviewInterceptorsTest::MyInterceptor")
    assert_not_called(MyInterceptor, :previewing_email, returns: mail) do
      BaseMailerPreview.call(:welcome)
    end
  end

  test "you can register and unregister a preview interceptor using its symbolized underscored name to the mail object that gets passed the mail object before previewing" do
    ActionMailer::Base.register_preview_interceptor(:"base_preview_interceptors_test/my_interceptor")
    mail = BaseMailer.welcome
    stub_any_instance(BaseMailerPreview) do |instance|
      instance.stub(:welcome, mail) do
        assert_called_with(MyInterceptor, :previewing_email, [mail]) do
          BaseMailerPreview.call(:welcome)
        end
      end
    end

    ActionMailer::Base.unregister_preview_interceptor(:"base_preview_interceptors_test/my_interceptor")
    assert_not_called(MyInterceptor, :previewing_email, returns: mail) do
      BaseMailerPreview.call(:welcome)
    end
  end

  test "you can register and unregister multiple preview interceptors to the mail object that both get passed the mail object before previewing" do
    ActionMailer::Base.register_preview_interceptors("BasePreviewInterceptorsTest::MyInterceptor", MySecondInterceptor)
    mail = BaseMailer.welcome
    stub_any_instance(BaseMailerPreview) do |instance|
      instance.stub(:welcome, mail) do
        assert_called_with(MyInterceptor, :previewing_email, [mail]) do
          assert_called_with(MySecondInterceptor, :previewing_email, [mail]) do
            BaseMailerPreview.call(:welcome)
          end
        end
      end
    end

    ActionMailer::Base.unregister_preview_interceptors("BasePreviewInterceptorsTest::MyInterceptor", MySecondInterceptor)
    assert_not_called(MyInterceptor, :previewing_email, returns: mail) do
      BaseMailerPreview.call(:welcome)
    end
    assert_not_called(MySecondInterceptor, :previewing_email, returns: mail) do
      BaseMailerPreview.call(:welcome)
    end
  end
end

class BasePreviewTest < ActiveSupport::TestCase
  class BaseMailerPreview < ActionMailer::Preview
    def welcome
      BaseMailer.welcome(params)
    end
  end

  test "has access to params" do
    params = { name: "World" }

    message = BaseMailerPreview.call(:welcome, params)
    assert_equal "World", message["name"].decoded
  end
end