Add unit tests for exception extensions

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2646 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/test/core_ext/exception_test.rb

@@ -0,0 +1,24 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/exception'
+
+class ExceptionExtTests < Test::Unit::TestCase
+  
+  def get_exception(cls = RuntimeError, msg = nil, trace = nil)
+    begin raise cls, msg, (trace || caller)
+    rescue Object => e
+      return e
+    end
+  end
+  
+  def setup
+    Exception::TraceSubstitutions.clear
+  end
+  
+  def test_clean_backtrace
+    Exception::TraceSubstitutions << [/\s*hidden.*/, '']
+    e = get_exception RuntimeError, 'RAWR', ['bhal.rb', 'rawh hid den stuff is not here', 'almost all']
+    assert_kind_of Exception, e
+    assert_equal ['bhal.rb', 'rawh hid den stuff is not here', 'almost all'], e.clean_backtrace
+  end
+  
+end