We currently keep a collection of test doubles in ...

# kotest

[jem]

We currently keep a collection of test doubles in an object and static import them in our StringSpecs.
With this, there's a test listener that "resets" all of the doubles in a BeforeTestListener.

Rather than reset, I would like to make a new instance of the collection of test doubles available with each test.

Currently:

"should foo" {
  TestApplication().execute {
    someFake.bar() shouldBe false
    someOtherFake.baz() shouldBe true
  }
}

Where TestApplication contains the fakes and suspend fun execute(f: suspend TestApplication.() -> Unit) = f(), so that the body has access to any fake it needs.

I'd like to get to

"should foo" {
  someFake.bar() shouldBe false
  someOtherFake.baz() shouldBe true
}

But I'm finding it very difficult to extend or configure the test to permit this.

Is this kind of thing supported/possible?

[LeoColman]

Seems to me you want some kind of Extension to execute your tests inside a specific 'context'

[LeoColman]

https://kotest.io/docs/framework/extensions/extensions-introduction.html

[LeoColman]

So you'd have a beforeSpec and afterSpec for example

[LeoColman]

I think you'd still need to get your fakes from the extension, so it would be extension.someFake.bar(), but it's close enough IMO

[jem]

Wasn't sure how to access extension, but it lead me to this solution.

private val apps = ConcurrentHashMap<Descriptor.TestDescriptor, TestApplication>()

    /** Enables `app` in any test to create or get an instance of TestApplication for that test case */
    val <http://StringSpecScope.app|StringSpecScope.app>: TestApplication
      get() = apps.getOrPut(this.testCase.descriptor) {
        TestApplication(this.testCase.descriptor)
      }
  }