[kotlin/test] Runtime error on test case is not handled correctly

Programming Kotlin
1

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For reference, here is the code I wrote on Matrix exercise:

class Matrix(private val matrixAsString: String) {
    private var matrix = matrixAsString.split("\n").map { it.split(" ").map { it.toInt() }.toList() }.toList()

    fun column(colNr: Int): List<Int> = matrix.map { it[colNr - 100] }.toList()

    fun row(rowNr: Int): List<Int> = matrix[rowNr - 1]
}

I wrote incorrect code for column method; it will almost always throw runtime exception.
Although overall test result is marked as failed, individual test cases are marked as passed.