Is there a better way to test the following in kotest: ```collection.find { it is SomeType }.shouldN...

# kotest

[Jonathan Olsson]

Is there a better way to test the following in kotest:

collection.find { it is SomeType }.shouldNotBeNull()

I was looking for something in the line of:

collection.shouldContainOneOf<SomeType>()

[Emil Kantis]

collection.forOne { it is SomeType }

[Emil Kantis]

https://kotest.io/docs/assertions/inspectors.html

[Jonathan Olsson]

Ah, nice.

[Jonathan Olsson]

Still a neat idea to be able to reify the type, e.g.:

collection.shouldContainOneOf<SomeType>() {
    it.shouldBeTypeOf<SomeType>()
}

[Jonathan Olsson]

I guess doing this is the best way:

collection.forOne {
    it.shouldBeTypeOf<SomeType>()
    it.someFieldInSomeType shouldBe somethingElse
}

[Jonathan Olsson]

it will be type casted.

[sam]

list.filterIsInstance<Foo>().shouldNotBeNull()