--- /dev/null
+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
--- /dev/null
+require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+
+class AboutObjects < EdgeCase::Koan
+ def test_everything_is_an_object
+ assert_equal __(true), 1.is_a?(Object)
+ assert_equal __(true), 1.5.is_a?(Object)
+ assert_equal __(true), "string".is_a?(Object)
+ assert_equal __(true), nil.is_a?(Object)
+ assert_equal __(true), Object.is_a?(Object)
+ end
+
+ def test_objects_can_be_converted_to_strings
+ assert_equal __("123"), 123.to_s
+ assert_equal __(""), nil.to_s
+ end
+
+ def test_objects_can_be_inspected
+ assert_equal __("123"), 123.inspect
+ assert_equal __("nil"), nil.inspect
+ end
+
+ def test_every_object_has_an_id
+ obj = Object.new
+ assert_equal __(Fixnum), obj.object_id.class
+ end
+
+ def test_every_object_has_different_id
+ obj = Object.new
+ another_obj = Object.new
+ assert_equal __(true), obj.object_id != another_obj.object_id
+ end
+
+ def test_some_system_objects_always_have_the_same_id
+ assert_equal __(0), false.object_id
+ assert_equal __(2), true.object_id
+ assert_equal __(4), nil.object_id
+ end
+
+ def test_small_integers_have_fixed_ids
+ assert_equal __(1), 0.object_id
+ assert_equal __(3), 1.object_id
+ assert_equal __(5), 2.object_id
+ assert_equal __(201), 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 __(true), obj != copy
+ assert_equal __(true), obj.object_id != copy.object_id
+ end
+end