If possible we should support hooks without parameters. For instance

Naive implementation would be to add methods like this: <div class="highlight high

Actually, after a day of reflexion and after implementing the <code class="notranslate

Support hooks without parameter about cucumber-jvm-scala HOT 2 CLOSED

cucumber commented on June 28, 2024

Support hooks without parameter

from cucumber-jvm-scala.

Comments (2)

gaeljw commented on June 28, 2024

Naive implementation would be to add methods like this:

// Current method
def Before(tagExpression: String)(body: Scenario => Unit): Unit = {
  Before(tagExpression, DEFAULT_BEFORE_ORDER)(body)
}

// Added method
def Before(tagExpression: String)(body: => Unit): Unit = {
  Before(tagExpression, DEFAULT_BEFORE_ORDER)(_ => body)
}

But from a user perspective, you get errors "Cannot resolve overloaded method 'Before'".

After having a look, I came up with a solution that I don't think it's worth shipping because it would:

bring some complexity in the code (similar to what is done for Step in ScalaDsl)
bring a breaking change to the users (need to write Before() { } or Before(order= 2) { })

What I ended up writing:

  sealed trait HookType

  case object BeforeType extends HookType
  // TODO other types

  val Before = new Hook(BeforeType)
  // TODO other vals

  final class Hook(hookType: HookType) {
    def apply(tagExpression: String = EMPTY_TAG_EXPRESSION, order: Int = DEFAULT_BEFORE_ORDER): HookImpl = new HookImpl(hookType, tagExpression, order)
  }

  final class HookImpl(hookType: HookType, tagExpression: String, order: Int) {

    def apply(body: HookBody): Unit = {
      hookType match {
        case BeforeType =>
          registry.beforeHooks += ScalaHookDetails(tagExpression, order, body)
        // TODO other cases
      }
    }

    def apply(body: => Unit): Unit = {
      apply(_ => body)
    }

  }