Await insert to finish before asserting - scala

Question

I have a model and wrote tests before I started. Now my problem is: While the functionality works, my tests are non-deterministic. Most of the time they work, but sometimes they don't. I assume it's because of the Future
But let's show you what I mean by example:
before {
db.run(animals.createTable)
}
after {
db.run(animals.dropTable)
}
"An animal" must "have a unique id" in
{
val setup = DBIO.seq(
animals.insert(Animal("Ape")),
animals.insert(Animal("Dog"))
)
db.run(setup)
val result = db.run(animals.tableQuery.result).futureValue
result shouldBe a[Seq[_]]
result distinct.length shouldEqual 2
result(0).id should not equal result(1).id
}
I assume sometimes the db.run(setup) finishes in time, but sometimes it does not, hence I then get an AssertionException "expected length was 2, actual 0". As said, to me it looks like a "race condition" here (I know that is not the correct terminus ;)).
So, what I tried was simply awaiting the result of the insert-statement like so:
Await.ready(db.run(setup), Duration.Inf)
But that doesn't change a thing. So why is that? Can somebody explain to me why Await does not block here? I assumed this to block and only execute the lines that come after, when the insert had been executed.
I also tried wrapping the assertions in an .onComplete-block, but no luck either.
Any hints for me?

Answer 1

I suspect your issue is that sometimes your before hook has not finished either, since it's also async. I would suspect that if you add an Await.ready to your future in the before block along with your setup block, the problem will go away.