diff --git a/test/test_cases/test_case.dart b/test/test_cases/test_case.dart
index f5b3e46..f428d4b 100644
--- a/test/test_cases/test_case.dart
+++ b/test/test_cases/test_case.dart
@@ -26,7 +26,45 @@ const String gbTestCases = r'''
     },
     false
   ],
-
+  [
+    "$gt    /$lt     strings - fail $lt    ",
+    {
+      "word": {
+        "$gt": "alphabet",
+        "$lt": "zebra"
+      }
+    },
+    {
+      "word": "zebra"
+    },
+    false
+  ],
+  [
+    "$gt    /$lt     strings - pass",
+    {
+      "word": {
+        "$gt": "alphabet",
+        "$lt": "zebra"
+      }
+    },
+    {
+      "word": "always"
+    },
+    true
+  ],
+  [
+    "$gt    /$lt     strings - fail uppercase",
+    {
+      "word": {
+        "$gt": "alphabet",
+        "$lt": "zebra"
+      }
+    },
+    {
+      "word": "AZL"
+    },
+    false
+  ],
         [
           "$not     - fail",
           {