How to create a MiniTest::Mock object that expects to_s

I suspect it is not possible, but maybe I’m lucky:
how can I create a mock object with MiniTest that expects a
call to the to_s method?

1.9.3-p194 :001 > require ‘minitest/mock’

1.9.3-p194 :002 > obj = MiniTest::Mock.new

1.9.3-p194 :003 > obj.expect(:size, 5)

1.9.3-p194 :004 > obj.expect(:to_s, ‘an object’)

1.9.3-p194 :005 > obj.size
=> 5
1.9.3-p194 :006 > obj.to_s
=> “#MiniTest::Mock:0x82eea98

Am 12.10.2012 18:35, schrieb [email protected]:

1.9.3-p194 :004 > obj.expect(:to_s, ‘an object’)

1.9.3-p194 :005 > obj.size
=> 5
1.9.3-p194 :006 > obj.to_s
=> “#MiniTest::Mock:0x82eea98

My workaround for the moment is using a singleton method:

1.9.3-p194 :001 > require ‘minitest/mock’
1.9.3-p194 :002 > obj = MiniTest::Mock.new
1.9.3-p194 :003 > obj.expect(:size, 5)
1.9.3-p194 :004 > def obj.to_s; ‘an object’; end
1.9.3-p194 :005 > obj.size
=> 5
1.9.3-p194 :006 > obj.to_s
=> “an object”

Am 14.10.2012 16:56, schrieb [email protected]:


1.9.3-p194 :002 > obj = MiniTest::Mock.new
1.9.3-p194 :003 > obj.expect(:size, 5)
1.9.3-p194 :004 > def obj.to_s; ‘an object’; end
1.9.3-p194 :005 > obj.size
=> 5
1.9.3-p194 :006 > obj.to_s
=> “an object”

Am still interested in how to do this properly. Thanks.

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