tests: added test for LKI from copied spell (related to Swan Song fix from #12883)

Mage.Tests/src/test/java/org/mage/test/cards/copy/CopySpellTest.java

@@ -22,7 +22,7 @@ import java.util.Set;
 import java.util.UUID;
 
 /**
- * @author LevelX2
+ * @author LevelX2, JayDi85
  */
 public class CopySpellTest extends CardTestPlayerBase {
 
@@ -905,4 +905,56 @@ public class CopySpellTest extends CardTestPlayerBase {
             Assert.fail(infoPrefix + " - " + "cards must have same zone and zcc: " + zcc1 + " - " + zone1 + " != " + zcc2 + " - " + zone2);
         }
     }
+
+    /**
+     * Bug: If Swan Song is used to counter a copied spell, no tokens are created #12883
+     */
+    @Test
+    public void test_LKI() {
+        // Counter target enchantment, instant, or sorcery spell.
+        // Its controller creates a 2/2 blue Bird creature token with flying.
+        addCard(Zone.HAND, playerA, "Swan Song", 1); // {U}
+        addCard(Zone.BATTLEFIELD, playerA, "Island", 1);
+        //
+        // Until end of turn, whenever a player casts an instant or sorcery spell, that player copies it and
+        // may choose new targets for the copy.
+        addCard(Zone.HAND, playerA, "Bonus Round", 1); // {1}{R}{R}
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 3);
+        //
+        addCard(Zone.HAND, playerA, "Lightning Bolt", 1); // {R}
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 1);
+        addCard(Zone.BATTLEFIELD, playerB, "Grizzly Bears", 1);
+        addCard(Zone.BATTLEFIELD, playerB, "Augmenting Automaton", 1);
+
+        checkPermanentCount("before", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerA, "Bird Token", 0);
+        checkPermanentCount("before", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerB, "Grizzly Bears", 1);
+        checkPermanentCount("before", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerB, "Augmenting Automaton", 1);
+
+        // prepare copy effect
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {R}", 3);
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Bonus Round");
+        waitStackResolved(1, PhaseStep.PRECOMBAT_MAIN);
+
+        // cast and duplicate bolt
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Lightning Bolt");
+        addTarget(playerA, "Grizzly Bears"); // original target
+        setChoice(playerA, true); // use new target
+        addTarget(playerA, "Augmenting Automaton"); // copy target
+        waitStackResolved(1, PhaseStep.PRECOMBAT_MAIN, true); // resolve copy trigger
+        checkStackObject("on copy", 1, PhaseStep.PRECOMBAT_MAIN, playerA, "Cast Lightning Bolt", 2);
+
+        // counter copy and save Augmenting Automaton
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {U}", 1);
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Swan Song", "Lightning Bolt[only copy]", "Lightning Bolt", StackClause.WHILE_COPY_ON_STACK);
+        setChoice(playerA, false); // no change target for duplicated counter spell (non-relevant here)
+        waitStackResolved(1, PhaseStep.PRECOMBAT_MAIN);
+
+        checkPermanentCount("after", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerA, "Bird Token", 1);
+        checkPermanentCount("after", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerB, "Grizzly Bears", 0);
+        checkPermanentCount("after", 1, PhaseStep.PRECOMBAT_MAIN, playerA, playerB, "Augmenting Automaton", 1);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_COMBAT);
+        execute();
+    }
 }

Mage.Tests/src/test/java/org/mage/test/player/TestPlayer.java

@@ -1291,7 +1291,7 @@ public class TestPlayer implements Player {
     private void printStack(Game game) {
         System.out.println("Stack objects: " + game.getStack().size());
         game.getStack().forEach(stack -> {
-            System.out.println(stack.getStackAbility().toString());
+            System.out.println(stack.getStackAbility().toString() + (stack.isCopy() ? " [copy]" : ""));
         });
     }
 

Mage/src/main/java/mage/game/stack/SpellStack.java

@@ -83,7 +83,7 @@ public class SpellStack extends ArrayDeque<StackObject> {
             if (!game.replaceEvent(GameEvent.getEvent(GameEvent.EventType.COUNTER, objectId, source, stackObject.getControllerId()))) {
                 // spells are removed from stack by the card movement
                 if (!(stackObject instanceof Spell) 
-                        || stackObject.isCopy()) { // ensure that copies of stackobjects have their history recorded ie: Swan Song 
+                        || stackObject.isCopy()) { // !ensure that copies of stackobjects have their history recorded ie: Swan Song
                     this.remove(stackObject, game);
                     game.rememberLKI(Zone.STACK, stackObject);
                 }