test: add field-level assertions to black pawn PromotionRequired test

modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala

@@ -312,6 +312,12 @@ class GameControllerTest extends AnyFunSuite with Matchers:
     val board = FenParser.parseBoard("8/8/8/8/4K3/8/4p3/8").get
     val result = GameController.processMove(board, GameHistory.empty, Color.Black, "e2e1")
     result should matchPattern { case _: MoveResult.PromotionRequired => }
+    result match
+      case MoveResult.PromotionRequired(from, to, _, _, _, turn) =>
+        from should be (sq(File.E, Rank.R2))
+        to   should be (sq(File.E, Rank.R1))
+        turn should be (Color.Black)
+      case _ => fail("Expected PromotionRequired")
 
   test("processMove detects pawn capturing to back rank as PromotionRequired with captured piece"):
     val board = FenParser.parseBoard("3q4/4P3/8/8/8/8/8/8").get