如何创建不调用底层对象的构造函数的ScalaMock存根？

import org.scalamock.scalatest.MockFactory
import org.scalatest.{FlatSpec, Matchers}

class MyClass {
  def myMethod(): String = {
    "Hello, world!"
  }
}

class MyTest extends FlatSpec with Matchers with MockFactory {
  "MyClass" should "return a mocked value" in {
    val mockClass = mock[MyClass]
    (mockClass.myMethod _).expects().returning("Mocked value")

    val result = mockClass.myMethod()
    result should be("Mocked value")
  }
}