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object Test extends App {
val str = "ABCDEFGHIJKLMABCDEFGHIJKLM"
val surrogateStr = "an old Turkic letter: \uD803\uDC22"
type SB = {
def indexOf(str: String): Int
def indexOf(str: String, fromIndex: Int): Int
def lastIndexOf(str: String): Int
def lastIndexOf(str: String, fromIndex: Int): Int
}
import scala.collection.mutable.{ StringBuilder => ScalaStringBuilder }
import java.lang.{ StringBuilder => JavaStringBuilder }
val sbScala = new ScalaStringBuilder() append str
val sbJava = new JavaStringBuilder() append str
val sbs: List[SB] = List[SB](sbScala, sbJava)
def sameAnswers(f: (SB) => Int) = assert(f(sbScala) == f(sbJava))
sameAnswers(_.indexOf(""))
sameAnswers(_.indexOf("G"))
sameAnswers(_.indexOf("ABC"))
sameAnswers(_.indexOf("KLM"))
sameAnswers(_.indexOf("QZV"))
sameAnswers(_.indexOf("LMABC"))
sameAnswers(_.lastIndexOf(""))
sameAnswers(_.lastIndexOf("M"))
sameAnswers(_.lastIndexOf("ABCDEFG"))
sameAnswers(_.lastIndexOf("KLM"))
sameAnswers(_.lastIndexOf("QZV"))
sameAnswers(_.lastIndexOf("GHI", 22))
sameAnswers(_.lastIndexOf("KLM", 22))
// testing that the "reverse" implementation avoids reversing surrogate pairs
val jsb = new JavaStringBuilder(surrogateStr) reverse
val ssb = new ScalaStringBuilder(surrogateStr) reverseContents ;
assert(jsb.toString == ssb.toString)
}
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