Add Running A Single MiniTest Example as a ruby til

README.md

@@ -296,6 +296,7 @@ _381 TILs and counting..._
 - [Replace The Current Process With An External Command](ruby/replace-the-current-process-with-an-external-command.md)
 - [Rendering ERB](ruby/rendering-erb.md)
 - [Returning With Sequel](ruby/returning-with-sequel.md)
+- [Running A Single MiniTest Example](ruby/running-a-single-minitest-example.md)
 - [Safe Navigation Operator](ruby/safe-navigation-operator.md)
 - [Set RVM Default Ruby](ruby/set-rvm-default-ruby.md)
 - [Show Public Methods With Pry](ruby/show-public-methods-with-pry.md)

ruby/running-a-single-minitest-example.md

@@ -0,0 +1,36 @@
+# Running A Single MiniTest Example
+
+Consider the following
+[MiniTest](http://ruby-doc.org/stdlib-2.0.0/libdoc/minitest/rdoc/MiniTest.html)
+file:
+
+```ruby
+# test_stuff.rb
+require 'minitest/autorun'
+
+class TestStuff < MiniTest::Unit::TestCase
+  def test_first_thing
+    assert_equal 4, (2 * 2)
+  end
+
+  def test_second_thing
+    assert_equal 9, (3 * 3)
+  end
+end
+```
+
+If we want to run all the tests in this file, we can do so with:
+
+```bash
+$ ruby test_stuff.rb
+```
+
+But what if we want to run a specific test? We can target a single MiniTest
+example with the `--name` flag and the name of that example. We can do
+something like the following:
+
+```bash
+$ ruby test_stuff.rb --name test_second_thing
+```
+
+[source](http://stackoverflow.com/a/5292885/535590)