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78 lines
2.1 KiB
Ruby
78 lines
2.1 KiB
Ruby
require File.expand_path(File.dirname(__FILE__) + '/edgecase')
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class AboutSymbols < EdgeCase::Koan
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def test_symbols_are_symbols
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symbol = :ruby
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assert_equal __(true), symbol.is_a?(Symbol)
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end
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def test_symbols_can_be_compared
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symbol1 = :a_symbol
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symbol2 = :a_symbol
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symbol3 = :something_else
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assert symbol1 == __(symbol2)
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assert symbol1 != __(symbol3)
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end
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def test_identical_symbols_are_a_single_internal_object
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symbol1 = :a_symbol
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symbol2 = :a_symbol
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assert symbol1.equal?(__(symbol2))
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assert_equal __(symbol1.object_id), symbol2.object_id
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end
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def test_method_names_become_symbols
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all_symbols = Symbol.all_symbols
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assert_equal __(true), all_symbols.include?(:test_method_names_are_symbols)
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end
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RubyConstant = "What is the sound of one hand clapping?"
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def test_constants_become_symbols
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all_symbols = Symbol.all_symbols
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assert_equal true, all_symbols.include?(__(:RubyConstant))
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end
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def test_symbols_can_be_made_from_strings
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string = "catsAndDogs"
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assert_equal __(:catsAndDogs), string.to_sym
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end
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def test_symbols_with_spaces_can_be_built
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symbol = :"cats and dogs"
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assert_equal symbol, __("cats and dogs").to_sym
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end
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def test_to_s_is_called_on_interpolated_symbols
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symbol = :cats
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string = "It is raining #{symbol} and dogs."
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assert_equal __('It is raining cats and dogs.'), string
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end
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def test_symbols_are_not_strings
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symbol = :ruby
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assert_equal __(false), symbol.is_a?(String)
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assert_equal __(false), symbol.eql?("ruby")
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end
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def test_symbols_do_not_have_string_methods
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symbol = :not_a_string
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assert_equal __(false), symbol.respond_to?(:each_char)
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assert_equal __(false), symbol.respond_to?(:reverse)
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end
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# It's important to realize that symbols are not "immutable
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# strings", though they are immutable. None of the
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# interesting string operations are available on symbols.
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def test_symbols_cannot_be_concatenated
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# Exceptions will be pondered further father down the path
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assert_raise(___(NoMethodError)) do
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:cats + :dogs
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end
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end
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end
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