Ruby on rails: mock and stub library [closed]

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What the best library to use for mock, stub... in ROR application?

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Mocha is a quite nice mocking and stubbing library for Ruby.

Have a look at the example usages.

def test_mocking_a_class_method
  product = Product.new
  Product.expects(:find).with(1).returns(product)
  assert_equal product, Product.find(1)
end

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RSpec comes with mocking capabilities. There is also FlexMock and rr