final class CustomAssertion[A, B] extends AnyRef
CustomAssertion allows users to create their own custom assertions for use in
assertTrue
. They are constructed with CustomAssertion.make
.
// Definition sealed trait Pet case class Dog(hasBone: Boolean) extends Pet case class Fish(bubbles: Double) extends Pet case class Cat(livesRemaining: Int) extends Color val lives = CustomAssertion.make[Pet] { case Cat(livesRemaining) => Right(livesRemaining) case other => Left(s"Expected $$other to be Cat") } // Usage suite("custom assertions")( test("as even") { val pet: Option[Pet] = Some(Cat(8)) assertTrue(pet.is(_.some.custom(lives)) == 8) } )
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