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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..20).first, 10
assert_equal (10..20).first(3), [10, 11, 12]
end
assert('Range#last') do
assert_equal (10..20).last, 20
assert_equal (10...20).last, 20
assert_equal (10..20).last(3), [18, 19, 20]
assert_equal (10...20).last(3), [17, 18, 19]
end
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