CODEWITHSUNDEEP
rubymetaprogramming
Veerendra Manikonda
Veerendra Manikonda

Reputation: 127

Ruby Metaprogramming

I am having a method which returns the price of a given symbol and i am writing a test for that method.

This is my test

 def setup
   @asset = NetAssetValue.new
 end

 def test_retrieve_price_for_symbol_YHOO
   assert_equal(33.987, @asset.retrieve_price_for_a_symbol('YHOO'))
 end

 def test_retrive_price_for_YHOO        
   def self.retrieve_price_for_a_symbol(symbol)
     33.77
   end

   assert_equal(33.97, @asset.retrieve_price_for_a_symbol('YHOO'))
 end

This is my method.

def retrieve_price_for_a_symbol(symbol)
  symbol_price = { "YHOO" => 33.987, "UPS" => 35.345, "T" => 80.90 }
  raise Exception if(symbol_price[symbol].nil?)
  symbol_price[symbol]
end

I am trying to mock the retrieve_price_for_a_symbol method by writing same method in test class but when i call it, the call is happening to method in main class not in the test class.

How do I add that method to meta class from test and how do i call it? Please help.

Upvotes: 1

Views: 172

Answers (2)

Bryan Ash
Bryan Ash

Reputation: 4489

Assuming you don't really want to mock the method you're testing...

You are currently defining your mock on the instance of the test class. You can add your mock directly to the @asset object:

def test_retrive_price_for_YHOO
  def @asset.retrieve_price_for_a_symbol(symbol)
    33.77
  end

  assert_equal(33.97, @asset.retrieve_price_for_a_symbol('YHOO'))
end

Upvotes: 2

prat0318
prat0318

Reputation: 621

Instead of re-defining the method inside, you need to mock it out.

Replace the method definition inside the test with

@asset.expects(:retrieve_price_for_a_symbol).with('YHOO').returns(33.97)

Upvotes: 2

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