diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 8eea4ccd410459ae6fe4ac8e34113224e21287a9..65c57dd8093e8dfb8e072d1b75959f12515e569d 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Updating ActionController::TestSession to behave as a hash with indifferent
+    access:
+
+    *Jeremy Friesen*
+
 *   Using strings or symbols for middleware class names is deprecated.  Convert
     things like this:
 
diff --git a/actionpack/lib/action_controller/test_case.rb b/actionpack/lib/action_controller/test_case.rb
index 103986e44adfb236fc46f4289db1c4e1c55051ec..39cbc0cd70b1da0ddcf161cb7c8005f27f10ccd8 100644
--- a/actionpack/lib/action_controller/test_case.rb
+++ b/actionpack/lib/action_controller/test_case.rb
@@ -174,8 +174,8 @@ def destroy
       clear
     end
 
-    def fetch(*args, &block)
-      @data.fetch(*args, &block)
+    def fetch(key, *args, &block)
+      @data.fetch(key.to_s, *args, &block)
     end
 
     private
diff --git a/actionpack/test/dispatch/session/test_session_test.rb b/actionpack/test/dispatch/session/test_session_test.rb
index 59c030176b36b5ecc94533b20dd00ab2588f452d..3e61d123e349250c885e3fd30f199b1bac876b2b 100644
--- a/actionpack/test/dispatch/session/test_session_test.rb
+++ b/actionpack/test/dispatch/session/test_session_test.rb
@@ -46,6 +46,16 @@ def test_fetch_returns_default
     assert_equal('2', session.fetch(:two, '2'))
   end
 
+  def test_fetch_on_symbol_returns_value
+    session = ActionController::TestSession.new(one: '1')
+    assert_equal('1', session.fetch(:one))
+  end
+
+  def test_fetch_on_string_returns_value
+    session = ActionController::TestSession.new(one: '1')
+    assert_equal('1', session.fetch('one'))
+  end
+
   def test_fetch_returns_block_value
     session = ActionController::TestSession.new(one: '1')
     assert_equal(2, session.fetch('2') { |key| key.to_i })