diff --git a/Mage.Tests/src/test/java/org/mage/test/combat/BecomesBlockedTest.java b/Mage.Tests/src/test/java/org/mage/test/combat/BecomesBlockedTest.java
new file mode 100644
index 00000000000..6d30af4adbc
--- /dev/null
+++ b/Mage.Tests/src/test/java/org/mage/test/combat/BecomesBlockedTest.java
@@ -0,0 +1,98 @@
+package org.mage.test.combat;
+
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ * @author xenohedron
+ */
+public class BecomesBlockedTest extends CardTestPlayerBase {
+
+    private static final String trapRunner = "Trap Runner"; // 2/3
+    private static final String blockAbility = "{T}: Target unblocked attacking creature becomes blocked";
+    // {T}: Target unblocked attacking creature becomes blocked.
+    // Activate only during combat after blockers are declared.
+    // (This ability works on creatures that can’t be blocked.)
+
+    private static final String somberwaldAlpha = "Somberwald Alpha"; // 3/2
+    // Whenever a creature you control becomes blocked, it gets +1/+1 until end of turn.
+
+    private static final String slitherBlade = "Slither Blade"; // 1/2 can't be blocked
+    private static final String forestwalker = "Somberwald Dryad"; // 2/2 forestwalk
+
+
+    @Test
+    public void testCantBeBlockedBecomesBlocked() {
+        addCard(Zone.BATTLEFIELD, playerA, slitherBlade);
+        addCard(Zone.BATTLEFIELD, playerA, somberwaldAlpha);
+        addCard(Zone.BATTLEFIELD, playerB, trapRunner);
+
+        attack(1, playerA, slitherBlade, playerB);
+        activateAbility(1, PhaseStep.DECLARE_BLOCKERS, playerB, blockAbility, slitherBlade);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertLife(playerB, 20);
+        assertPowerToughness(playerA, slitherBlade, 2, 3);
+    }
+
+    @Test
+    public void testForestwalkerBecomesBlockedNoForest() {
+        addCard(Zone.BATTLEFIELD, playerA, forestwalker);
+        addCard(Zone.BATTLEFIELD, playerA, somberwaldAlpha);
+        addCard(Zone.BATTLEFIELD, playerB, trapRunner);
+
+        attack(1, playerA, forestwalker, playerB);
+        activateAbility(1, PhaseStep.DECLARE_BLOCKERS, playerB, blockAbility, forestwalker);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertLife(playerB, 20);
+        assertPowerToughness(playerA, forestwalker, 3, 3);
+    }
+
+    @Test
+    public void testForestwalkerBecomesBlockedWithForest() {
+        addCard(Zone.BATTLEFIELD, playerA, forestwalker);
+        addCard(Zone.BATTLEFIELD, playerA, somberwaldAlpha);
+        addCard(Zone.BATTLEFIELD, playerB, trapRunner);
+        addCard(Zone.BATTLEFIELD, playerB, "Forest");
+
+        attack(1, playerA, forestwalker, playerB);
+        activateAbility(1, PhaseStep.DECLARE_BLOCKERS, playerB, blockAbility, forestwalker);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertLife(playerB, 20);
+        assertPowerToughness(playerA, forestwalker, 3, 3);
+    }
+
+    @Test
+    public void testTrampleBlocked() {
+        String wurm = "Yavimaya Wurm"; // 6/4 trample
+
+        addCard(Zone.BATTLEFIELD, playerA, wurm);
+        addCard(Zone.BATTLEFIELD, playerA, somberwaldAlpha);
+        addCard(Zone.BATTLEFIELD, playerB, trapRunner);
+        addCard(Zone.BATTLEFIELD, playerB, "Forest");
+
+        attack(1, playerA, wurm, playerB);
+        activateAbility(1, PhaseStep.DECLARE_BLOCKERS, playerB, blockAbility, wurm);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertLife(playerB, 13);
+        assertPowerToughness(playerA, wurm, 7, 5);
+    }
+
+}