fix character handling in params (#84)

* fix charecter handling in params
* added char test

Author: DvirDukhan

src/main/java/com/redislabs/redisgraph/impl/Utils.java

@@ -99,6 +99,9 @@ private static String valueToString(Object value) {
         if(String.class.isInstance(value)){
             return quoteString((String) value);
         }
+        if(Character.class.isInstance((value))){
+            return quoteString(((Character)value).toString());
+        }
 
         if(value.getClass().isArray()){
             return arrayToString((Object[]) value);

src/test/java/com/redislabs/redisgraph/RedisGraphAPITest.java

@@ -879,8 +879,8 @@ public void testPath(){
 
     @Test
     public void testParameters(){
-        Object[] parameters = {1, 2.3, true, false, null, "str", Arrays.asList(1,2,3), new Integer[]{1,2,3}};
-        Object[] expected_anwsers = {1L, 2.3, true, false, null, "str", Arrays.asList(1L, 2L, 3L), new Long[]{1L, 2L, 3L}};
+        Object[] parameters = {1, 2.3, true, false, null, "str", 'a', "b" ,Arrays.asList(1,2,3), new Integer[]{1,2,3}};
+        Object[] expected_anwsers = {1L, 2.3, true, false, null, "str", "a", "b", Arrays.asList(1L, 2L, 3L), new Long[]{1L, 2L, 3L}};
         Map<String, Object> params = new HashMap<>();
         for (int i=0; i < parameters.length; i++) {
             Object param = parameters[i];