What is the negative of mustBe in Scalatest

Question

I am comfortable using mustBe in Scalatest. Eg.

A mustBe (Some(List(1)))

But how do I test something like A must not be Some(anything here, done care what it is) ?

Answer 1

Negation can be asserted on by simply adding the word not to the matcher expression, for example,

class So1Spec extends FlatSpec with MustMatchers {
  "BeingNegative" should "assert negation" in {
    1 must not be 2
  }
}