`assert_template` no more passing with what ever string that matches.

Given Im rendering an template `/layout/hello.html.erb`, assert_template was
passing with any string that matches. This behavior allowed false passing like:

	assert_template "layout"
	assert_template "out/hello"

Now the passing possibilities are:

	assert_template "layout/hello"
	assert_template "hello"

fixing assert_template bug when template matches expected, but not ends with

Cherry Pick Merge: Fixes issue #3849 assert_template false positive

taking redundant test off

prevening incorrect assert_template when rendering with repeated names in path

updating CHANGELOG with bugfix: assert_template false passing

2 files changed, 23 insertions, 0 deletions

diff --git a/actionpack/test/controller/action_pack_assertions_test.rb b/actionpack/test/controller/action_pack_assertions_test.rb
index 4ab5d92a2b..ca542eb7e2 100644
--- a/actionpack/test/controller/action_pack_assertions_test.rb
+++ b/actionpack/test/controller/action_pack_assertions_test.rb
@@ -7,6 +7,7 @@ class ActionPackAssertionsController < ActionController::Base
   def nothing() head :ok end
 
   def hello_world() render :template => "test/hello_world"; end
+  def hello_repeating_in_path() render :template => "test/hello/hello"; end
 
   def hello_xml_world() render :template => "test/hello_xml_world"; end
 
@@ -464,6 +465,20 @@ class AssertTemplateTest < ActionController::TestCase
     end
   end
 
+  def test_fails_with_incorrect_string_that_matches
+    get :hello_world
+    assert_raise(ActiveSupport::TestCase::Assertion) do
+      assert_template 'est/he'
+    end
+  end
+
+  def test_fails_with_repeated_name_in_path
+    get :hello_repeating_in_path
+    assert_raise(ActiveSupport::TestCase::Assertion) do
+      assert_template 'test/hello'
+    end
+  end
+
   def test_fails_with_incorrect_symbol
     get :hello_world
     assert_raise(ActiveSupport::TestCase::Assertion) do
@@ -471,6 +486,13 @@ class AssertTemplateTest < ActionController::TestCase
     end
   end
 
+  def test_fails_with_incorrect_symbol_that_matches
+    get :hello_world
+    assert_raise(ActiveSupport::TestCase::Assertion) do
+      assert_template :"est/he"
+    end
+  end
+
   def test_fails_with_wrong_layout
     get :render_with_layout
     assert_raise(ActiveSupport::TestCase::Assertion) do
diff --git a/actionpack/test/fixtures/test/hello/hello.erb b/actionpack/test/fixtures/test/hello/hello.erb
new file mode 100644
index 0000000000..6769dd60bd
--- /dev/null
+++ b/actionpack/test/fixtures/test/hello/hello.erb
@@ -0,0 +1 @@
+Hello world!
\ No newline at end of file