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diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
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+++ b/actionmailer/test/base_test.rb
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+# 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 "you can specify a different template for multipart render" do
+    mail = BaseMailer.implicit_different_template_with_block("explicit_multipart_templates").deliver
+    assert_equal("HTML Explicit Multipart Templates", mail.html_part.body.decoded)
+    assert_equal("TEXT Explicit Multipart Templates", 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
+    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
+
+  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