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##
# Range(Ext) Test
assert('Range#cover?') do
assert_true ("a".."z").cover?("c")
assert_true !("a".."z").cover?("5")
assert_true ("a".."z").cover?("cc")
end
assert('Range#first') do
assert_equal 10, (10..20).first
assert_equal [10, 11, 12], (10..20).first(3)
end
assert('Range#last') do
assert_equal 20, (10..20).last
assert_equal 20, (10...20).last
assert_equal [18, 19, 20], (10..20).last(3)
assert_equal [17, 18, 19], (10...20).last(3)
end
assert('Range#size') do
assert_equal 42, (1..42).size
assert_equal 41, (1...42).size
assert_equal 6, (1...6.3).size
assert_equal 5, (1...6.0).size
assert_equal 5, (1.1...6).size
assert_nil ('a'..'z').size
end
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