[ci skip] remove unnecessary mention to Test::Unit from docs

Fix the guide to state that Rails uses Minitest as the default test
framework.

Remove unnecessary mention to Test::Unit from the API docs
('constantize' and 'safe_constantize').

1 files changed, 1 insertions, 1 deletions

diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index 342d39a528..e26cd0eea8 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -193,7 +193,7 @@ The full set of methods that can be used in this block are as follows:
 * `scaffold_controller` different from `resource_controller`, defines which generator to use for generating a _scaffolded_ controller when using `rails generate scaffold`. Defaults to `:scaffold_controller`.
 * `stylesheets` turns on the hook for stylesheets in generators. Used in Rails for when the `scaffold` generator is run, but this hook can be used in other generates as well. Defaults to `true`.
 * `stylesheet_engine` configures the stylesheet engine (for eg. sass) to be used when generating assets. Defaults to `:css`.
-* `test_framework` defines which test framework to use. Defaults to `false` and will use Test::Unit by default.
+* `test_framework` defines which test framework to use. Defaults to `false` and will use Minitest by default.
 * `template_engine` defines which template engine to use, such as ERB or Haml. Defaults to `:erb`.
 
 ### Configuring Middleware