* Demon's Horn - Added test (#6890).

Mage.Tests/src/test/java/org/mage/test/cards/single/dst/DemonsHornTest.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.mage.test.cards.single.dst;
+
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ *
+ * @author LevelX2
+ */
+public class DemonsHornTest extends CardTestPlayerBase {
+
+    
+    @Test
+    public void testWithBlackSpell() {
+        setStrictChooseMode(true);
+        
+        // When Abyssal Gatekeeper dies, each player sacrifices a creature.
+        addCard(Zone.HAND, playerA, "Abyssal Gatekeeper", 1); // Creature {2}{B}   1/1
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 2);
+        
+        // Whenever a player casts a black spell, you may gain 1 life.
+        addCard(Zone.BATTLEFIELD, playerB, "Demon's Horn", 1);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Abyssal Gatekeeper");
+        setChoice(playerB, "Yes");
+
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertAllCommandsUsed();
+        
+        assertPermanentCount(playerA, "Abyssal Gatekeeper", 1);
+
+        assertLife(playerA, 20);
+        assertLife(playerB, 21);
+    }
+    
+    /**
+     * https://github.com/magefree/mage/issues/6890
+     * 
+     * Color == Color Identity #6890
+     *
+     * Alesha, Who Smiles at Death triggers Demon's Horn
+     */
+    @Test
+    public void testSpellWithBlackManaOnlyInTriggeredOptionalCost() {
+        setStrictChooseMode(true);
+        
+        // First strike
+        // Whenever Alesha, Who Smiles at Death attacks, you may pay {W/B}{W/B}. If you do, return target creature card with power 2 or less from your graveyard to the battlefield tapped and attacking.        
+        addCard(Zone.HAND, playerA, "Alesha, Who Smiles at Death", 1); // Creature {2}{R}   3/2
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 3);
+        
+        // Whenever a player casts a black spell, you may gain 1 life.
+        addCard(Zone.BATTLEFIELD, playerB, "Demon's Horn", 1);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Alesha, Who Smiles at Death");
+
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertAllCommandsUsed();
+        
+        assertPermanentCount(playerA, "Alesha, Who Smiles at Death", 1);
+
+        assertLife(playerA, 20);
+        assertLife(playerB, 20);
+    }
+
+}