(plan 5)

(expect "length of string" (= (length "hello") 5))

(expect "empty strings" (= (length "") 0))

(expect "string-upcase" (string= (string-upcase "helLo") "HELLO"))

(expect "string-downcase" (string= (string-downcase "HEllO") "hello"))

(expect "string-capitalize"
        (string= (string-capitalize "hello world i like cheese")
                 "Hello World I Like Cheese"))