Annotate languages in code blocks

guides/source/testing.md

@@ -480,7 +480,7 @@ Known extensions: rails, pride
 
 The `--name` (`-n`) and `--exclude` options can be used to filter (include or exclude) tests based on the test name, not the file name. Test names are derived from the standard Ruby nomenclature of Class::Module::method. To name the tests, the Minitest DSL replaces `::` with `#` and converts test names to methods using snake_case and the prefix `test_` (preserving case). For example:
 
-```
+```ruby
 # test/models/bookmark_test.rb
 require "test_helper"
 
@@ -497,13 +497,13 @@ The above code will generate the ruby method `BookmarkTest::test_should_not_save
 
 In a Rails app you can run all tests that are in classes starting with the name "Post" (e.g. PostsControllerTest in controllers, PostTest in models and PostsTest in system) using:
 
-```
+```bash
 $ bin/rails test --name /^Post/
 ```
 
 To exclude any test in any file that contains the exact word "user", even if it's the last word, use:
 
-```
+```bash
 $ bin/rails test --exclude /_user(_|$)/
 ```