fix Obeka, Splitter of Seconds' extra phase calling beginning of turn method

Mage.Tests/src/test/java/org/mage/test/cards/single/otj/ObekaSplitterOfSecondsTest.java

@@ -37,4 +37,31 @@ public class ObekaSplitterOfSecondsTest extends CardTestPlayerBase {
         assertTapped(obeka, true); // checks that no extra untap happened
         assertHandCount(playerA, 0); // checks that no draw step happened
     }
+
+    // Bug: Extra upkeep is wrongly changing summoning sickness status
+    @Test
+    public void test_ExtraUpkeep_TapAbility() {
+        setStrictChooseMode(true);
+
+        addCard(Zone.BATTLEFIELD, playerA, obeka);
+        // At the beginning of your upkeep, you gain 1 life.
+        addCard(Zone.BATTLEFIELD, playerA, "Fountain of Renewal");
+        addCard(Zone.HAND, playerA, "Soulmender"); // "{T}: You gain 1 life
+        addCard(Zone.BATTLEFIELD, playerA, "Plains");
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Soulmender", true);
+        checkPlayableAbility("Soulmender summoning sick pre-combat", 1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: You gain 1 life", false);
+
+        attack(1, playerA, obeka, playerB);
+        checkLife("Extra upkeeps are in extra phases after combat", 1, PhaseStep.END_COMBAT, playerA, 20 + 1);
+        checkPlayableAbility("Soulmender summoning sick after extra upkeep", 1, PhaseStep.POSTCOMBAT_MAIN, playerA, "{T}: You gain 1 life", false);
+
+        checkPlayableAbility("Soulmender no longer summoning sick turn 3", 3, PhaseStep.UPKEEP, playerA, "{T}: You gain 1 life", true);
+        activateAbility(3, PhaseStep.UPKEEP, playerA, "{T}: You gain 1 life");
+
+        setStopAt(3, PhaseStep.PRECOMBAT_MAIN);
+        execute();
+
+        assertLife(playerA, 20 + 2 + 2 + 1); // 2 regular upkeep + 2 obeka ones + 1 Soulmender activation
+    }
 }

Mage/src/main/java/mage/game/turn/BeginningPhase.java

@@ -2,18 +2,24 @@
 
 package mage.game.turn;
 
-import java.util.UUID;
-
 import mage.constants.TurnPhase;
 import mage.game.Game;
 import mage.game.events.GameEvent.EventType;
 
+import java.util.UUID;
+
 /**
  * @author BetaSteward_at_googlemail.com
  */
 public class BeginningPhase extends Phase {
 
+    private final boolean isExtra;
+
     public BeginningPhase() {
+        this(false);
+    }
+
+    public BeginningPhase(boolean isExtra) {
         this.type = TurnPhase.BEGINNING;
         this.event = EventType.BEGINNING_PHASE;
         this.preEvent = EventType.BEGINNING_PHASE_PRE;
@@ -21,17 +27,20 @@ public class BeginningPhase extends Phase {
         this.steps.add(new UntapStep());
         this.steps.add(new UpkeepStep());
         this.steps.add(new DrawStep());
+        this.isExtra = isExtra;
     }
 
     @Override
     public boolean beginPhase(Game game, UUID activePlayerId) {
+        if (!isExtra) {
             game.getBattlefield().beginningOfTurn(game);
+        }
         return super.beginPhase(game, activePlayerId);
     }
 
-
     protected BeginningPhase(final BeginningPhase phase) {
         super(phase);
+        this.isExtra = phase.isExtra;
     }
 
     @Override

Mage/src/main/java/mage/game/turn/Turn.java

@@ -246,7 +246,7 @@ public class Turn implements Serializable {
             Phase phase;
             switch (extraPhase) {
                 case BEGINNING:
-                    phase = new BeginningPhase();
+                    phase = new BeginningPhase(true);
                     break;
                 case PRECOMBAT_MAIN:
                     phase = new PreCombatMainPhase();