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about_keyword_arguments.rb
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about_keyword_arguments.rb
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require File.expand_path(File.dirname(__FILE__) + '/neo')
class AboutKeywordArguments < Neo::Koan
def method_with_keyword_arguments(one: 1, two: 'two')
[one, two]
end
def test_keyword_arguments
assert_equal Array, method_with_keyword_arguments.class
assert_equal [1, 'two'], method_with_keyword_arguments
assert_equal ['one', 'two'], method_with_keyword_arguments(one: 'one')
assert_equal [1, 2], method_with_keyword_arguments(two: 2)
end
def method_with_keyword_arguments_with_mandatory_argument(one, two: 2, three: 3)
[one, two, three]
end
def test_keyword_arguments_with_wrong_number_of_arguments
exception = assert_raise (ArgumentError) do
method_with_keyword_arguments_with_mandatory_argument
end
assert_match(/wrong number of arguments/, exception.message)
end
# THINK ABOUT IT:
#
# Keyword arguments always have a default value, making them optional to the caller
end