assert_equal __, symbol.is_a?(Symbol)
end
- def test_symbols_are_not_strings
- symbol = :ruby
- assert_equal __, symbol.is_a?(String)
- assert_equal __, symbol.eql?("ruby")
- end
-
- def test_symbols_have_unique_identity
- symbol1 = :identity
- symbol2 = :identity
+ def test_symbols_can_be_compared
+ symbol1 = :a_symbol
+ symbol2 = :a_symbol
symbol3 = :something_else
assert symbol1 == __
assert symbol1 != __
end
- def test_identical_symbols_are_represented_by_a_single_internal_object
- symbol1 = :identity
- symbol2 = :identity
+ def test_identical_symbols_are_a_single_internal_object
+ symbol1 = :a_symbol
+ symbol2 = :a_symbol
assert symbol1.equal?(__)
assert_equal __, symbol2.object_id
assert_equal __, all_symbols.include?(:test_method_names_are_symbols)
end
- RubyConstant = "This string is assigned to a constant."
+ RubyConstant = "What is the sound of one hand clapping?"
def test_constants_become_symbols
all_symbols = Symbol.all_symbols
assert_equal symbol, __.to_sym
end
- def test_interpolated_symbols_become_strings
+ def test_to_s_is_called_on_interpolated_symbols
symbol = :cats
string = "It is raining #{symbol} and dogs."
assert_equal __, string
end
+ def test_symbols_are_not_strings
+ symbol = :ruby
+ assert_equal __, symbol.is_a?(String)
+ assert_equal __, symbol.eql?("ruby")
+ end
+
+ def test_symbols_do_not_have_string_methods
+ symbol = :not_a_string
+ assert_equal __, symbol.respond_to?(:each_char)
+ assert_equal __, symbol.respond_to?(:reverse)
+ end
+ # It's important to realize that symbols are not "immutable
+ # strings", though they are immutable. None of the
+ # interesting string operations are available on symbols.
def test_symbols_cannot_be_concatenated
+ # Exceptions will be pondered further father down the path
assert_raise(__) do
:cats + :dogs
end
assert_equal __(true), symbol.is_a?(Symbol)
end
- def test_symbols_are_not_strings
- symbol = :ruby
- assert_equal __(false), symbol.is_a?(String)
- assert_equal __(false), symbol.eql?("ruby")
- end
-
- def test_symbols_have_unique_identity
- symbol1 = :identity
- symbol2 = :identity
+ def test_symbols_can_be_compared
+ symbol1 = :a_symbol
+ symbol2 = :a_symbol
symbol3 = :something_else
assert symbol1 == __(symbol2)
- assert symbol1 != __(symbol2)
+ assert symbol1 != __(symbol3)
end
- def test_identical_symbols_are_represented_by_a_single_internal_object
- symbol1 = :identity
- symbol2 = :identity
+ def test_identical_symbols_are_a_single_internal_object
+ symbol1 = :a_symbol
+ symbol2 = :a_symbol
assert symbol1.equal?(__(symbol2))
assert_equal __(symbol1.object_id), symbol2.object_id
assert_equal __(true), all_symbols.include?(:test_method_names_are_symbols)
end
- RubyConstant = "This string is assigned to a constant."
+ RubyConstant = "What is the sound of one hand clapping?"
def test_constants_become_symbols
all_symbols = Symbol.all_symbols
assert_equal symbol, __("cats and dogs").to_sym
end
- def test_interpolated_symbols_become_strings
+ def test_to_s_is_called_on_interpolated_symbols
symbol = :cats
string = "It is raining #{symbol} and dogs."
assert_equal __('It is raining cats and dogs.'), string
end
+ def test_symbols_are_not_strings
+ symbol = :ruby
+ assert_equal __(false), symbol.is_a?(String)
+ assert_equal __(false), symbol.eql?("ruby")
+ end
+
+ def test_symbols_do_not_have_string_methods
+ symbol = :not_a_string
+ assert_equal __(false), symbol.respond_to?(:each_char)
+ assert_equal __(false), symbol.respond_to?(:reverse)
+ end
+ # It's important to realize that symbols are not "immutable
+ # strings", though they are immutable. None of the
+ # interesting string operations are available on symbols.
def test_symbols_cannot_be_concatenated
+ # Exceptions will be pondered further father down the path
assert_raise(__(NoMethodError)) do
:cats + :dogs
end