Add tests for raise monkey patch

Library/Homebrew/debrew/raise_plus.rb

@@ -11,6 +11,8 @@ end
 module RaisePlus
   alias :original_raise :raise
 
+  private
+
   def raise(*args)
     exception = case
                 when args.size == 0

Library/Homebrew/test/test_raise_plus.rb

+require 'testing_env'
+require 'debrew/raise_plus'
+
+class RaisePlusTests < Test::Unit::TestCase
+  include RaisePlus
+
+  def test_raises_runtime_error_when_no_args
+    assert_raises(RuntimeError) { raise }
+  end
+
+  def test_raises_runtime_error_with_string_arg
+    raise "foo"
+  rescue Exception => e
+    assert_kind_of RuntimeError, e
+    assert_equal "foo", e.to_s
+  end
+
+  def test_raises_given_exception_with_new_to_s
+    a = Exception.new("foo")
+    raise a, "bar"
+  rescue Exception => e
+    assert_equal "bar", e.to_s
+  end
+
+  def test_raises_same_instance
+    a = Exception.new("foo")
+    raise a
+  rescue Exception => e
+    assert_same e, a
+  end
+
+  def test_raises_exception_class
+    assert_raises(StandardError) { raise StandardError }
+  end
+
+  def test_raises_type_error_for_bad_args
+    assert_raises(TypeError) { raise 1 }
+  end
+
+  def test_raise_is_private
+    assert_raises(NoMethodError) do
+      Object.new.extend(RaisePlus).raise(RuntimeError)
+    end
+  end
+end