Fix the indeterminate test issue. (#791)

The issue was due to a couple describe blocks
not matching the definition in .
Since their name didn't match,
wasn't getting included in the minitest-specs. Since the
teardown didn't exist, the view context leaked to the
next tests to be ran.

spec/dummy/test/decorators/minitest/view_context_test.rb

@@ -13,12 +13,12 @@ describe "A decorator test" do
   it_does_not_leak_view_context
 end
 
-describe "A controller test" do
-  subject{ Class.new(ActionController::Base) }
+describe "A controller decorator test" do
+  subject { Class.new(ActionController::Base) }
 
   it_does_not_leak_view_context
 end
 
-describe "A mailer test" do
+describe "A mailer decorator test" do
   it_does_not_leak_view_context
 end