4 files changed, 26 insertions, 3 deletions
diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index 211190560a..8e59f033d0 100644
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -25,6 +25,7 @@ require "abstract_controller"
 require "action_mailer/version"
 
 # Common Active Support usage in Action Mailer
+require "active_support"
 require "active_support/rails"
 require "active_support/core_ext/class"
 require "active_support/core_ext/module/attr_internal"
diff --git a/actionmailer/lib/action_mailer/preview.rb b/actionmailer/lib/action_mailer/preview.rb
index b0152aff03..87ba743f3d 100644
--- a/actionmailer/lib/action_mailer/preview.rb
+++ b/actionmailer/lib/action_mailer/preview.rb
@@ -52,6 +52,12 @@ module ActionMailer
   class Preview
     extend ActiveSupport::DescendantsTracker
 
+    attr_reader :params
+
+    def initialize(params = {})
+      @params = params
+    end
+
     class << self
       # Returns all mailer preview classes.
       def all
@@ -62,8 +68,8 @@ module ActionMailer
       # Returns the mail object for the given email name. The registered preview
       # interceptors will be informed so that they can transform the message
       # as they would if the mail was actually being delivered.
-      def call(email)
-        preview = new
+      def call(email, params = {})
+        preview = new(params)
         message = preview.public_send(email)
         inform_preview_interceptors(message)
         message
diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 61960d411d..ebb97078e6 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -968,3 +968,19 @@ class BasePreviewInterceptorsTest < ActiveSupport::TestCase
     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" }
+
+    assert_called_with(BaseMailer, :welcome, [params]) do
+      BaseMailerPreview.call(:welcome, params)
+    end
+  end
+end
diff --git a/actionmailer/test/log_subscriber_test.rb b/actionmailer/test/log_subscriber_test.rb
index d864c3acca..7969782e07 100644
--- a/actionmailer/test/log_subscriber_test.rb
+++ b/actionmailer/test/log_subscriber_test.rb
@@ -26,7 +26,7 @@ class AMLogSubscriberTest < ActionMailer::TestCase
     wait
 
     assert_equal(1, @logger.logged(:info).size)
-    assert_match(/Sent mail to system@test.lindsaar.net/, @logger.logged(:info).first)
+    assert_match(/Sent mail to system@test\.lindsaar\.net/, @logger.logged(:info).first)
 
     assert_equal(2, @logger.logged(:debug).size)
     assert_match(/BaseMailer#welcome: processed outbound mail in [\d.]+ms/, @logger.logged(:debug).first)