ruby-koans/about_objects.rb at master · levelboy/ruby-koans · GitHub

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requireFile.expand_path(File.dirname(__FILE__) + '/edgecase')

classAboutObjects < EdgeCase::Koan
deftest_everything_is_an_object
assert_equaltrue,1.is_a?(Object)
assert_equaltrue,1.5.is_a?(Object)
assert_equaltrue,"string".is_a?(Object)
assert_equaltrue,nil.is_a?(Object)
assert_equaltrue,Object.is_a?(Object)
end

deftest_objects_can_be_converted_to_strings
assert_equal'123',123.to_s
assert_equal'',nil.to_s
end

deftest_objects_can_be_inspected
assert_equal'123',123.inspect
assert_equal'nil',nil.inspect
end

deftest_every_object_has_an_id
obj=Object.new
assert_equalFixnum,obj.object_id.class
end

deftest_every_object_has_different_id
obj=Object.new
another_obj=Object.new
assert_equaltrue,obj.object_id != another_obj.object_id
end

deftest_some_system_objects_always_have_the_same_id
assert_equal0,false.object_id
assert_equal2,true.object_id
assert_equal4,nil.object_id
end

deftest_small_integers_have_fixed_ids
assert_equal1,0.object_id
assert_equal3,1.object_id
assert_equal5,2.object_id
assert_equal201,100.object_id

# THINK ABOUT IT:
# What pattern do the object IDs for small integers follow?
end

deftest_clone_creates_a_different_object
obj=Object.new
copy=obj.clone

assert_equaltrue,obj != copy
assert_equaltrue,obj.object_id != copy.object_id
end
end