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57 lines
1.4 KiB
57 lines
1.4 KiB
require File.expand_path(File.dirname(__FILE__) + '/edgecase')
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class AboutObjects < EdgeCase::Koan
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def test_everything_is_an_object
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assert_equal __, 1.is_a?(Object)
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assert_equal __, 1.5.is_a?(Object)
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assert_equal __, "string".is_a?(Object)
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assert_equal __, nil.is_a?(Object)
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assert_equal __, 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.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.inspect
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assert_equal __, 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 __, 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 __, obj.object_id != another_obj.object_id
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end
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def test_some_system_objects_always_have_the_same_id
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assert_equal __, false.object_id
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assert_equal __, true.object_id
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assert_equal __, nil.object_id
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end
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def test_small_integers_have_fixed_ids
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assert_equal __, 0.object_id
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assert_equal __, 1.object_id
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assert_equal __, 2.object_id
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assert_equal __, 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 __, obj != copy
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assert_equal __, obj.object_id != copy.object_id
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end
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end
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