Add test coverage for `Object#with_options` with `Hash`-like

Add test coverage for existing `Object#with_options` support for
`Hash`-like objects.

The current implementation expects "Hash-like" to mean that the argument
implements both `Hash#deep_merge` and `#to_hash` (to be called
explicitly with `#to_hash` and implicitly with `**`).

activesupport/lib/active_support/core_ext/object/with_options.rb

@@ -5,9 +5,9 @@ require "active_support/option_merger"
 class Object
   # An elegant way to factor duplication out of options passed to a series of
   # method calls. Each method called in the block, with the block variable as
-  # the receiver, will have its options merged with the default +options+ hash
-  # provided. Each method called on the block variable must take an options
-  # hash as its final argument.
+  # the receiver, will have its options merged with the default +options+
+  # <tt>Hash</tt> or <tt>Hash</tt>-like object provided. Each method called on
+  # the block variable must take an options hash as its final argument.
   #
   # Without <tt>with_options</tt>, this code contains duplication:
   #

activesupport/test/option_merger_test.rb

@@ -114,6 +114,21 @@ class OptionMergerTest < ActiveSupport::TestCase
     assert_equal expected, @options
   end
 
+  def test_with_options_hash_like
+    hash_like = Class.new do
+      delegate :to_hash, :deep_merge, to: :@hash
+
+      def initialize(hash)
+        @hash = hash
+      end
+    end
+    local_options = { "cool" => true }
+    scope = with_options(hash_like.new(@options))
+
+    assert_equal local_options, method_with_options(local_options)
+    assert_equal @options.merge(local_options), scope.method_with_options(local_options)
+  end
+
   def test_with_options_no_block
     local_options = { "cool" => true }
     scope = with_options(@options)