Example how to print summary of test failures with utest

summary.scala

  override def utestFormatter: Formatter = new Formatter {
    import utest.framework._
    import utest.ufansi
    override def formatSummary(
        topLevelName: String,
        results: HTree[String, Result]
    ): Option[ufansi.Str] = Some {
      val summary = results match {
        case HTree.Node(_, c @ _*) =>
          c.collect {
              case Leaf(result) if result.value.isFailure =>
                List(topLevelName, result.name)
                  .mkString(ufansi.Color.Red("X ").toString(), ".", "\n") +
                  result.value.asInstanceOf[Failure[_]].exception.toString()
            }
            .mkString("\n")
        case HTree.Leaf(r) =>
          ""
      }
      if (summary.nonEmpty) {
        println("==========")
        println("= Failures")
        println("==========")
        println(summary)
      }
      summary
    }