mocking method calls in unit tests

mock

class B
  
 def some_call
    return True
 end
end

class A
  def meth
     return @b.some_call
  end

  def initialize(params={})
    params.each { |k,v| instance_variable_set "@#{k}",v } #setattr(self, k, v) }
  end
end

#require "minitest"
#require "minitest/autorun"
require "test/unit"
class ATest < Test::Unit::TestCase


  def setup
    @b = B.new
    def @b.some_call; false;end
    @a = A.new(b: @b)
  end

  def test_meth
    assert(!@a.meth())
  end
end