Cards that are cast using alternative cost effects keep their previous targets (#5189) - Add unit test.

Mage.Tests/src/test/java/org/mage/test/cards/cost/alternate/CastFromLibraryWithoutPayingManaCostTest.java

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+package org.mage.test.cards.cost.alternate;
+
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ * @author Quercitron
+ */
+public class CastFromLibraryWithoutPayingManaCostTest extends CardTestPlayerBase {
+
+    /**
+     * Test for issue https://github.com/magefree/mage/issues/5189
+     *
+     * I've cast Utter End via Sunforger, then later on I've shuffled Utter End from my GY back into my library
+     * via Elixir of Immortality. I cast Utter End again via Sunforger, but this time I don't get prompted to select
+     * a target - it keeps the old target, a permanent that's already in exile, and thus the recast Utter End fizzles.
+     */
+    @Test
+    public void testCastCardFromLibraryTwice() {
+        addCard(Zone.BATTLEFIELD, playerA, "Storm Crow");
+        // {R}{W}, Unattach Sunforger: Search your library for a red or white instant card with
+        // converted mana cost 4 or less and cast that card without paying its mana cost. Then shuffle your library.
+        // Equip {3}
+        addCard(Zone.BATTLEFIELD, playerA, "Sunforger");
+        // {2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.
+        addCard(Zone.BATTLEFIELD, playerA, "Elixir of Immortality");
+        addCard(Zone.BATTLEFIELD, playerA, "Plains", 10);
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 10);
+        // Exile target nonland permanent.
+        addCard(Zone.LIBRARY, playerA, "Utter End");
+
+        addCard(Zone.BATTLEFIELD, playerB, "Gray Ogre");
+        addCard(Zone.BATTLEFIELD, playerB, "Hill Giant");
+
+        // Equip Sunforger to Storm Crow.
+        activateAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Equip", "Storm Crow");
+        // Unattach Sunforger to cast Utter End from library targeting Gray Ogre.
+        activateAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{R}{W}, Unattach");
+        addTarget(playerA, "Utter End");
+        addTarget(playerA, "Gray Ogre");
+
+        // Sacrifice Elixir of Immortality to shuffle Utter End from graveyard to library.
+        activateAbility(1, PhaseStep.BEGIN_COMBAT, playerA, "{2}, {T}: You gain 5 life");
+
+        // Equip Sunforger to Storm Crow again.
+        activateAbility(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "Equip", "Storm Crow");
+        // Unattach Sunforger to cast Utter End from library targeting Hill Giant.
+        activateAbility(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "{R}{W}, Unattach");
+        addTarget(playerA, "Utter End");
+        addTarget(playerA, "Hill Giant");
+
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        // Check that Elixir of Immortality was sacrificed.
+        assertPermanentCount(playerA, "Elixir of Immortality", 0);
+
+        // Check that Gray Ogre was exiled.
+        assertPermanentCount(playerB, "Gray Ogre", 0);
+        // Check that Hill Giant was exiled.
+        assertPermanentCount(playerB, "Hill Giant", 0);
+
+        // Check that Utter End is in the graveyard.
+        assertGraveyardCount(playerA, "Utter End", 1);
+    }
+
+    @Test
+    public void testCastCardFromHandAndThenFromLibrary() {
+        addCard(Zone.BATTLEFIELD, playerA, "Storm Crow");
+        // {R}{W}, Unattach Sunforger: Search your library for a red or white instant card with
+        // converted mana cost 4 or less and cast that card without paying its mana cost. Then shuffle your library.
+        // Equip {3}
+        addCard(Zone.BATTLEFIELD, playerA, "Sunforger");
+        addCard(Zone.BATTLEFIELD, playerA, "Elixir of Immortality");
+        // {2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.
+        addCard(Zone.BATTLEFIELD, playerA, "Plains", 10);
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 10);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 10);
+        // Exile target nonland permanent.
+        addCard(Zone.HAND, playerA, "Utter End");
+
+        addCard(Zone.BATTLEFIELD, playerB, "Gray Ogre");
+        addCard(Zone.BATTLEFIELD, playerB, "Hill Giant");
+
+        // Cast Utter End from hand targeting Gray Ogre.
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Utter End", "Gray Ogre");
+
+        // Sacrifice Elixir of Immortality to shuffle Utter End from graveyard to library.
+        activateAbility(1, PhaseStep.BEGIN_COMBAT, playerA, "{2}, {T}: You gain 5 life");
+
+        // Equip Sunforger to Storm Crow.
+        activateAbility(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "Equip", "Storm Crow");
+        // Unattach Sunforger to cast Utter End from library targeting Hill Giant.
+        activateAbility(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "{R}{W}, Unattach");
+        addTarget(playerA, "Utter End");
+        addTarget(playerA, "Hill Giant");
+
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        // Check that Elixir of Immortality was sacrificed.
+        assertPermanentCount(playerA, "Elixir of Immortality", 0);
+
+        // Check that Gray Ogre was exiled.
+        assertPermanentCount(playerB, "Gray Ogre", 0);
+        // Check that Hill Giant was exiled.
+        assertPermanentCount(playerB, "Hill Giant", 0);
+
+        // Check that Utter End is in the graveyard.
+        assertGraveyardCount(playerA, "Utter End", 1);
+    }
+
+}