Use kotest-assertions

[petertrr]

kotest-assertions support multiplatform and are much more expressive than what's available in kotlin.test.

For example, this code

reporter.results.forEach { testResult ->
            assertTrue(!testResult.debugInfo!!.execCmd!!.contains("chapter"))
        }

will fail with Expected value to be true.. However with kotest it can be rewritten similarly to

reporter.results shouldNot exist { testResult ->
        testResult.debugInfo!!.execCmd!!.contains("chapter")
}

which will on failure describe the collection that has been tested