asynchronous tests

[eed3si9n]

scala/scala-dev#641 (comment)

If you want this to help Scala.js, an absolute requirement is support for asynchronous tests, i.e., tests returning a Future that will decide whether or not they succeeded.

Also it will be necessary that test classes extend a given class or trait. Annotations won't cut it.

[eed3si9n]

Minitest supports this already:

import scala.concurrent.ExecutionContext.Implicits.global

object MySimpleSuite extends SimpleTestSuite {
  testAsync("asynchronous execution") {
    val future = Future(100).map(_+1)

    for (result <- future) yield {
      assertEquals(result, 101)
    }
  }
}

and so does uTest https://github.com/lihaoyi/utest#asynchronous-tests

val tests = Tests {
  test("testSuccess"){
    Future {
      assert(true)
    }
  }
  test("testFail"){
    Future {
      assert(false)
    }
  }
  test("normalSuccess"){
    assert(true)
  }
  test("normalFail"){
    assert(false)
  }
}

TestRunner.runAsync(tests).map { results =>
 val leafResults = results.leaves.toSeq
 assert(leafResults(0).value.isSuccess) // root
 assert(leafResults(1).value.isSuccess) // testSuccess
 assert(leafResults(2).value.isFailure) // testFail
 assert(leafResults(3).value.isSuccess) // normalSuccess
}

When running the test suites from SBT, you do not need worry about any of this run vs runAsync stuff: the test runner will handle it for you and provide the correct results.

[eed3si9n]

Resolved by Minitest.