#56 open
James Mead

Stubbed method not being returned to its original state at the end of a test

Reported by James Mead | October 26th, 2009 @ 03:54 PM

Reported on behalf of Gareth Reeves :-

Running the following code gives a single expectation error in TestB#setup :-

  unexpected invocation: B.new()

It's like the stub expectation on B in TestA doesn't get removed when other tests run. While A (the superclass) gets cleaned up.

require 'rubygems'
require 'test/unit'
require 'mocha'

class A
  def value; 'a'; end
end

class B < A; end


class TestA < Test::Unit::TestCase
  def setup
    A.stubs( :new ).returns( 'this is a' )
    B.stubs( :new ).returns( 'this is b' )
    @a = A.new
    @b = B.new
  end

  def test_value
    assert_equal 'this is a', @a
    assert_equal 'this is b', @b
  end
end

class TestB < Test::Unit::TestCase
  def setup
    @b = B.new
  end

  def test_value
    assert_equal 'a', @b.value
  end
end

class TestAgain < Test::Unit::TestCase
  def setup
    @a = A.new
  end

  def test_value
    assert_equal 'a', @a.value
  end
end

Comments and changes to this ticket

  • James Mead

    James Mead October 26th, 2009 @ 03:56 PM

    • State changed from “new” to “open”

    I wonder whether it's significant that it's the new method that is being stubbed.

  • James Mead

    James Mead October 26th, 2009 @ 04:00 PM

    It doesn't appear to be significant that it's the new method that is being stubbed. The following test fails with a similar error :-

      unexpected invocation: B.wibble()

    require 'rubygems'
require 'test/unit'
require 'mocha'

class A
  def self.wibble; new; end
  def value; 'a'; end
end

class B < A; end


class TestA < Test::Unit::TestCase
  def setup
    A.stubs( :wibble ).returns( 'this is a' )
    B.stubs( :wibble ).returns( 'this is b' )
    @a = A.wibble
    @b = B.wibble
  end

  def test_value
    assert_equal 'this is a', @a
    assert_equal 'this is b', @b
  end
end

class TestB < Test::Unit::TestCase
  def setup
    @b = B.wibble
  end

  def test_value
    assert_equal 'a', @b.value
  end
end

class TestAgain < Test::Unit::TestCase
  def setup
    @a = A.wibble
  end

  def test_value
    assert_equal 'a', @a.value
  end
end

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