Test ability to store null values in map

src/test/java/org/redisson/RedissonMapTest.java

@@ -109,6 +109,26 @@ public class RedissonMapTest {
 
     }
 
+    @Test
+    public void testNull() {
+        Redisson redisson = Redisson.create();
+        Map<Integer, String> map = redisson.getMap("simple12");
+        map.put(1, null);
+        map.put(2, null);
+        map.put(3, "43");
+
+        Assert.assertEquals(3, map.size());
+
+        String val = map.get(2);
+        Assert.assertNull(val);
+        String val2 = map.get(1);
+        Assert.assertNull(val2);
+        String val3 = map.get(3);
+        Assert.assertEquals("43", val3);
+
+        clear(map);
+    }
+
     @Test
     public void testSimpleTypes() {
         Redisson redisson = Redisson.create();