NameInverter in Scala by me

NameInverter.scala

package cleancode

object NameInverter {

  def apply(name: String): String =
    swapFirstAndLast(splitName(name).dropWhile(isHonorific)).mkString(" ")

  def swapFirstAndLast(parts: List[String]) = parts match {
    case first :: last :: postNominals => last + "," :: first :: postNominals
    case _ => parts
  }

  private def splitName(name: String) = name.trim().split("\\s+").toList

  private def isHonorific(word: String) = word.matches("Mr\\.|Ms\\.")
}

NameInverterTest.scala

package cleancode

import org.scalatest.FlatSpec
import org.scalatest.matchers.MustMatchers

class NameInverterTest extends FlatSpec with MustMatchers  {

  "The name inverter" must "return empty string given an empty string" in {
    NameInverter("") must be ("")
  }

  it must "return simple names as they are" in {
    NameInverter("Name") must be ("Name")
  }

  it must "return remove extra spaces" in {
    NameInverter(" Name  ") must be ("Name")
  }

  it must "return last, first for full names" in {
    NameInverter("First Last") must be ("Last, First")
  }

  it must "ignore honorifics" in {
    NameInverter("Mr. First Last") must be("Last, First")
    NameInverter("Ms. First Last") must be("Last, First")
  }

  it must "preserve post nominals at the end" in {
    NameInverter("First Last Sr.") must be ("Last, First Sr.")
    NameInverter("First Last BS. Phd.") must be ("Last, First BS. Phd.")
  }

  it must "do all the things above for the same name" in {
    NameInverter("  Mr. Robert   Martin   III  esq.   ") must be ("Martin, Robert III esq.")
  }
}