How to use ScalaTest Matcher to Test Failure Exception Type?

Question

Given a scala function that can produces Failures:

def testableFunction(x: Int) : Try[Int] = {
  if(x == 0)
    Failure[Int](new IllegalArgumentException("0 is bad"))
  else if(x == 1)
    Failure[Int](new Exception("1 not so good either"))
  else
    Success(42)
}

How can scalatest matchers be used to test the Exception type?

I'm looking for something of the form:

testableFunction(0).failure.type should be IllegalArgumentException

testableFunction(1).failure.type should be Exception

Thank you in advance for your consideration and response.

scalatest.org/scaladoc/3.2.10/org/scalatest/TryValues.html - scalatest.org/user_guide/using_matchers#checkingAnObjectsClass — Luis Miguel Mejía Suárez
– Luis Miguel Mejía Suárez, Commented Jan 28, 2022 at 16:05

Ramón J Romero y Vigil · Accepted Answer · 2022-01-28 16:16:36Z

3

Mix in the TryValues trait:

class ExampleTestSpec extends Matchers with TryValues {
  ...
  testableFunction(0).failure.exception shouldBe a [IllegalArgumentException]
}

answered Jan 28, 2022 at 16:16

Ramón J Romero y Vigil

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