Hardcoded dependency on time

Wall.scala

package com.balopat.timeinjection

import java.util.Date

class Wall {
    var messages = List[Message]()

    def message(message: String) {
       messages ::= Message(message, new Date()) // hardcoded dependency on time!!! 
    }
}

case class Message(message: String, createdAt: Date)

WallSpec.scala

package com.balopat.timeinjection

import org.scalatest.FlatSpec
import java.util.Date
import org.scalatest.matchers.ShouldMatchers

class WallSpec extends FlatSpec with ShouldMatchers {

  "messages" should "be written in reverse order on the wall" in {
    val wall = new Wall
    val timeAtFirst = new Date()
    wall.message("Hello World!")
    val timeAtSecond = new Date()
    wall.message("Hello, HelloWorld!")

    wall.messages should equal(
      List(Message("Hello, HelloWorld!", timeAtSecond), //sometime equals sometime doesn't
        Message("Hello World!", timeAtFirst))         //sometime equals sometime doesn't
    )
  }
}