PlayerHand test

src/test/kotlin/eventDemo/app/entity/PlayerHandKtTest.kt

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+package eventDemo.app.entity
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.ints.shouldBeExactly
+import kotlin.test.assertNotNull
+
+class PlayerHandKtTest :
+    FunSpec({
+        test("addCards") {
+            // Given
+            val playerNumbers = 4
+            val players = (1..playerNumbers).map { Player(name = "name $it") }.toSet()
+            val firstPlayer = players.first()
+            val playersHands: PlayerHands = players.associateWith { emptyList() }
+            val card = Card.NumericCard(0, Card.Color.Red)
+
+            // When
+            val newHands: PlayerHands = playersHands.addCards(firstPlayer, listOf(card))
+
+            assertNotNull(newHands[firstPlayer]).size shouldBeExactly 1
+            assertNotNull(newHands[players.last()]).size shouldBeExactly 0
+        }
+
+        test("removeCard") {
+            // Given
+            val playerNumbers = 4
+            val players = (1..playerNumbers).map { Player(name = "name $it") }.toSet()
+            val firstPlayer = players.first()
+            val card1 = Card.NumericCard(1, Card.Color.Red)
+            val card2 = Card.NumericCard(2, Card.Color.Red)
+            val playersHands: PlayerHands =
+                players
+                    .associateWith<Player, List<Card>> { emptyList() }
+                    .addCards(firstPlayer, listOf(card1, card2))
+
+            // When
+            val newHands: PlayerHands = playersHands.removeCard(firstPlayer, card1)
+
+            assertNotNull(newHands[firstPlayer]).size shouldBeExactly 1
+            assertNotNull(newHands[players.last()]).size shouldBeExactly 0
+        }
+    })