57 lines
1.4 KiB
Ruby
57 lines
1.4 KiB
Ruby
require File.expand_path(File.dirname(__FILE__) + '/edgecase')
|
|
|
|
class AboutObjects < EdgeCase::Koan
|
|
def test_everything_is_an_object
|
|
assert_equal __, 1.is_a?(Object)
|
|
assert_equal __, 1.5.is_a?(Object)
|
|
assert_equal __, "string".is_a?(Object)
|
|
assert_equal __, nil.is_a?(Object)
|
|
assert_equal __, Object.is_a?(Object)
|
|
end
|
|
|
|
def test_objects_can_be_converted_to_strings
|
|
assert_equal __, 123.to_s
|
|
assert_equal __, nil.to_s
|
|
end
|
|
|
|
def test_objects_can_be_inspected
|
|
assert_equal __, 123.inspect
|
|
assert_equal __, nil.inspect
|
|
end
|
|
|
|
def test_every_object_has_an_id
|
|
obj = Object.new
|
|
assert_equal __, obj.object_id.class
|
|
end
|
|
|
|
def test_every_object_has_different_id
|
|
obj = Object.new
|
|
another_obj = Object.new
|
|
assert_equal __, obj.object_id != another_obj.object_id
|
|
end
|
|
|
|
def test_some_system_objects_always_have_the_same_id
|
|
assert_equal __, false.object_id
|
|
assert_equal __, true.object_id
|
|
assert_equal __, nil.object_id
|
|
end
|
|
|
|
def test_small_integers_have_fixed_ids
|
|
assert_equal __, 0.object_id
|
|
assert_equal __, 1.object_id
|
|
assert_equal __, 2.object_id
|
|
assert_equal __, 100.object_id
|
|
|
|
# THINK ABOUT IT:
|
|
# What pattern do the object IDs for small integers follow?
|
|
end
|
|
|
|
def test_clone_creates_a_different_object
|
|
obj = Object.new
|
|
copy = obj.clone
|
|
|
|
assert_equal __, obj != copy
|
|
assert_equal __, obj.object_id != copy.object_id
|
|
end
|
|
end
|