when I run the following code

require 'test/unit'
class TC_Pram < Test::Unit::TestCase
   def initialize(name)
     @name=name
   end
   def test_array
      puts assert_equal(2,@name[2])
   end
end
tc=TC_Pram.new("wang")
tc.test_array

there are some errors as follows

c:/ruby/lib/ruby/1.8/test/unit/testcase.rb:125:in `add_assertion':
undefined method `add_assertion' for nil:NilClass (NoMethodError)
 from c:/ruby/lib/ruby/1.8/test/unit/assertions.rb:494:in
`_wrap_assertion'
 from c:/ruby/lib/ruby/1.8/test/unit/assertions.rb:46:in
`assert_block'
 from c:/ruby/lib/ruby/1.8/test/unit/assertions.rb:83:in
`assert_equal'
 from test_unit.rb:7:in `test_array'
 from test_unit.rb:11

I don't know how to resolve it , so I need  your help , thanks

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