A very, very budget cut test running framework that also works with grade weights. Expanded from hackyTest.kt. It eventually got used in https://github.com/daviskeene/KTeach

hackyTestWithScores.kt

data class TestResult(var score: Double, var maxScore: Double);

fun main() {
    println("Running stuff")
    val results = listOf(
      case("5 + 10", 2.0) {
          var x = 15;
          x = x + 10
          add(5, 10) == x
      },

      case("10 + 15", weight=0.25) {
          add(10, 15) == 25
      },

      case("Negative") {
          add(10, -15) == -5
      },

      case("Zero", 10.0) {
          add(10, 0) == 10
      }
    )
    
    val (score, totalScore) = sumScore(results) 
    println("Got $score / $totalScore")
}

fun sumScore(results: List<TestResult>): Pair<Double, Double> {
    var score: Double = 0.0
    var totalScore: Double = 0.0
    for ((pointsScored, possiblePoints) in results) {
    	score += pointsScored
        totalScore += possiblePoints
    }
    return Pair(score, totalScore)
}

fun case(name: String, weight: Double = 1.0, code: () -> Boolean): TestResult {
    val result = code()
    val resultDisplay = if (result) "PASSED" else "FAILED"
    println("TEST " + name + " -> " + resultDisplay) 

    val score = if (result) weight else 0.0
    return TestResult(score, weight)
} 

// User code from here
fun add(a: Int, b: Int): Int {
    return a + b
}

package TestUtil

data class TestResult(var score: Double, var maxScore: Double)
data class Case(val name: String, val weight: Double = 1.0, val code: () -> Boolean) {
    fun test(): TestResult {
        val result = code()
        val resultDisplay = if (result) "PASSED" else "FAILED"
        println("TEST $name -> $resultDisplay ($weight)")

        val score = if (result) weight else 0.0
        return TestResult(score, weight)
    }
}

// exmaple
fun main() {
    val cases = listOf(
        Case("5 + 10", 2.0) {
            var x = 15;
            x = x + 10
            add(5, 10) == x
        },

        Case("10 + 15", weight=0.25) {
            add(10, 15) == 25
        },

        Case("Negative") {
            add(10, -15) == -5
        },

        Case("Zero", 10.0) {
            add(10, 0) == 10
        }
    )

    runCases(cases)
}

fun runCases(cases: List<Case>) {
    println("Running tests")
    val (score, totalScore) = sumScore(cases)
    println("Got $score / $totalScore")
}

fun sumScore(cases: List<Case>): Pair<Double, Double> {
    var score: Double = 0.0
    var totalScore: Double = 0.0
    cases.forEach {
        val result = it.test()
        score += result.score
        totalScore += result.maxScore
    }
    return Pair(score, totalScore)
}



// User code from here
fun add(a: Int, b: Int): Int {
    return a + b
}

Even fancier version

MIT License