support quote strings (#125)

* update util.py file
* add test

Co-authored-by: Guy Korland <gkorland@gmail.com>

Author: AvitalFineRedis

redisgraph/util.py

@@ -27,10 +27,4 @@ def quote_string(v):
 
     v = v.replace('"', '\\"')
 
-    if v[0] != '"':
-        v = '"' + v
-
-    if v[-1] != '"':
-        v = v + '"'
-
-    return v
+    return '"{}"'.format(v)

tests/unit/test_util.py

@@ -14,4 +14,6 @@ def test_quote_string(self):
         self.assertEqual(util.quote_string(10), 10)
         self.assertEqual(util.quote_string("abc"), '"abc"')
         self.assertEqual(util.quote_string(""), '""')
+        self.assertEqual(util.quote_string('\"'), '"\\\""')
+        self.assertEqual(util.quote_string('"'), '"\\""')
         self.assertEqual(util.quote_string('a"a'), '"a\\"a"')