Reuse tests in another suite in ScalaTest

I have the following ADT:

sealed trait TestAdt

case class First(i: Int) extends TestAdt
case class Second(j: String) extends TestAdt
case class Third(k: Long) extends TestAdt

I have a function using TestAdt with the following implementation:

def foo(testAdt: TestAdt): Int = testAdt match {
    case f: First => fooFirst(f)
    case j: Second => fooSecond(j)
    case k: Third => fooThird(k)
} 

private def fooFirst(firstAdt: First): Int = //...
private def fooSecond(secondAdt: Second): Int = //...
private def fooThird(thirdAdt: Third): Int = //...

I wrote tests on all fooFirst, fooSecond and fooThird functions as follows:

class FooFirstTest extends AnyFunSuite with Matchers {
    //test cases
}

class FooSecondTest extends AnyFunSuite with Matchers {
    //test cases
}

class FooThirdTest extends AnyFunSuite with Matchers {
    //test cases
}

Now I'd like to test the function foo itself so it seems naturally to just reuse test cases that were implemented for each of the branches separately: FooFirstTest, FooSecondTest and FooThirdTest. For example FooFirstTest covers some test case for the function fooFirst, so the case is hold for the function foo as well.

THE QUESTION: How to reuse tests FooFirstTest, FooSecondTest and FooThirdTest for functions fooFirst, fooSecond and fooThird correspondingly to write tests for the function foo?

class FooTest extends AnyFunSuite with Matchers {
    //How to apply FooFirstTest, FooSecondTest, FooThirdTest here?
}