Dependency Injection Example

di.rb

# DEPENDENCY INJECTION

class A

  def initialize(helper)
  end

  def doSomething
    helper.someFunction
  end

end


class B

  def someFunction
  end

end


# IN YOUR TESTS
class FakeB
  attr_reader :returnValue

  def someFunction
    return returnValue
  end
end

def someSpec
  fake = B.new
  fake.returnValue = 5

  a = A.new( fake )
  a.doSomething

  a.should #assertion goes here
end