activesupport/test/test_test.rb


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require File.dirname(__FILE__) + '/abstract_unit'

class AssertDifferenceTest < Test::Unit::TestCase
  def setup
    @object = Class.new do
      attr_accessor :num 
      def increment
        self.num += 1
      end

      def decrement
        self.num -= 1
      end
    end.new    
    @object.num = 0
  end

  if lambda { }.respond_to?(:binding)
    def test_assert_no_difference
      assert_no_difference '@object.num' do
        # ...
      end
    end

    def test_assert_difference
      assert_difference '@object.num', +1 do
        @object.increment
      end
    end

    def test_assert_difference_with_implicit_difference
      assert_difference '@object.num' do
        @object.increment
      end
    end

    def test_arbitrary_expression
      assert_difference '@object.num + 1', +2 do
        @object.increment
        @object.increment
      end
    end

    def test_negative_differences
      assert_difference '@object.num', -1 do
        @object.decrement
      end
    end

    def test_expression_is_evaluated_in_the_appropriate_scope
      local_scope = 'foo'
      silence_warnings do
        assert_difference('local_scope; @object.num') { @object.increment }
      end
    end

    def test_array_of_expressions
      assert_difference [ '@object.num', '@object.num + 1' ], +1 do
        @object.increment
      end
    end
  else
    def default_test; end
  end
end