diff --git a/spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java b/spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java
index 4b2632c5..f7a74983 100644
--- a/spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java
+++ b/spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java
@@ -19,7 +19,6 @@ import static org.fest.assertions.Assertions.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.eq;
-import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.spy;
@@ -1147,6 +1146,16 @@ public class SessionRepositoryFilterTests<S extends ExpiringSession> {
 		Ordered o = (Ordered) filter;
 	}
 
+	@Test(expected = IllegalArgumentException.class)
+	public void setHttpSessionStrategyNull() {
+		filter.setHttpSessionStrategy((HttpSessionStrategy) null);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void setMultiHttpSessionStrategyNull() {
+		filter.setHttpSessionStrategy((MultiHttpSessionStrategy) null);
+	}
+
 	// --- helper methods
 
 	private void assertNewSession() {