51 lines
1.3 KiB
Ruby
51 lines
1.3 KiB
Ruby
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require File.expand_path(File.dirname(__FILE__) + '/neo')
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class AboutObjects < Neo::Koan
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def test_everything_is_an_object
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assert_equal true, 1.is_a?(Object)
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assert_equal true, 1.5.is_a?(Object)
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assert_equal true, "string".is_a?(Object)
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assert_equal true, nil.is_a?(Object) # like JS?
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assert_equal true, Object.is_a?(Object)
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end
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def test_objects_can_be_converted_to_strings
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assert_equal "123", 123.to_s
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assert_equal "", nil.to_s
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end
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def test_objects_can_be_inspected
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assert_equal '123', 123.inspect
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assert_equal "nil", nil.inspect
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end
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def test_every_object_has_an_id
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obj = Object.new
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assert_equal Integer, obj.object_id.class
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end
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def test_every_object_has_different_id
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obj = Object.new
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another_obj = Object.new
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assert_equal true, obj.object_id != another_obj.object_id
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end
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def test_small_integers_have_fixed_ids
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assert_equal 1, 0.object_id # pattern is id = value + (value + 1)
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assert_equal 3, 1.object_id
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assert_equal 5, 2.object_id
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assert_equal 201, 100.object_id
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# THINK ABOUT IT:
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# What pattern do the object IDs for small integers follow?
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end
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def test_clone_creates_a_different_object
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obj = Object.new
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copy = obj.clone
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assert_equal true, obj != copy
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assert_equal true, obj.object_id != copy.object_id
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end
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end
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