UT for nest of scarabs issue, replicating bug #3174

Mage.Tests/src/test/java/org/mage/test/cards/enchantments/NestOfScarabsTest.java

@@ -0,0 +1,53 @@
+package org.mage.test.cards.enchantments;
+
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import mage.counters.CounterType;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ *
+ * @author escplan9
+ */
+public class NestOfScarabsTest extends CardTestPlayerBase {
+
+    /*
+    * Reported bug: Nest of Scarabs not triggering off -1/-1 counters placed on creatures.
+    * NOTE: this test is failing due to bug in code. See issue #3174
+    */
+    @Test
+    public void scarabsWithSoulStinger_TwoCountersTwoTokens() {
+        
+        /*
+        Nest of Scarabs 2B
+        Enchantment
+        Whenever you put one or more -1/-1 counters on a creature, create that many 1/1 black Insect creature tokens. 
+        */
+        String nScarabs = "Nest of Scarabs";
+        
+        /*
+        Soulstinger 3B
+        Creature - Scorpion Demon 4/5
+        When Soulstinger enters the battlefield, put two -1/-1 counter on target creature you control.
+        When Soulstinger dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on Soulstinger. 
+        */
+        String stinger = "Soulstinger";
+        
+        addCard(Zone.BATTLEFIELD, playerA, nScarabs);
+        addCard(Zone.HAND, playerA, stinger);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 4);
+        
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, stinger);
+        addTarget(playerA, stinger); // place two -1/-1 counters on himself
+        
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+        
+        assertPermanentCount(playerA, nScarabs, 1);
+        assertPermanentCount(playerA, stinger, 1);
+        assertCounterCount(playerA, stinger, CounterType.M1M1, 2);
+        assertPowerToughness(playerA, stinger, 2, 3); // 4/5 with two -1/-1 counters
+        assertPermanentCount(playerA, "Insect", 2); // two counters = two insects
+    }
+}