use minitest instead of test-unit

test/helper.rb

@@ -7,12 +7,9 @@ rescue Bundler::BundlerError => e
   $stderr.puts "Run `bundle install` to install missing gems"
   exit e.status_code
 end
-require 'test/unit'
+require 'minitest/autorun'
 require 'shoulda'
 
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
 $LOAD_PATH.unshift(File.dirname(__FILE__))
 require 'swot'
-
-class Test::Unit::TestCase
-end

test/test_swot.rb

@@ -1,7 +1,7 @@
 # encoding: UTF-8
 require 'helper'
 
-class TestEmail < Test::Unit::TestCase
+class TestEmail < MiniTest::Test
   should "recognizes academic email addresses and domains" do
     assert_equal Swot::is_academic?('lreilly@stanford.edu'),          true
     assert_equal Swot::is_academic?('LREILLY@STANFORD.EDU'),          true
@@ -66,7 +66,7 @@ class TestEmail < Test::Unit::TestCase
   end
 
   should "not err on tld-only domains" do
-    assert_nothing_raised { Swot::is_academic? ".com" }
+    Swot::is_academic? ".com"
     assert_equal false, Swot::is_academic?(".com")
   end
 end