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import org.scalacheck._
object Test extends Properties("String") {
property("startsWith") = Prop.forAll((a: String, b: String) => (a+b).startsWith(a))
property("endsWith") = Prop.forAll((a: String, b: String) => (a+b).endsWith(b))
property("concat") = Prop.forAll((a: String, b: String) =>
(a+b).length >= a.length && (a+b).length >= b.length
)
property("substring") = Prop.forAll((a: String, b: String) =>
(a+b).substring(a.length) == b
)
property("substring") = Prop.forAll((a: String, b: String, c: String) =>
(a+b+c).substring(a.length, a.length+b.length) == b
)
}
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