update

src/main.rs

@@ -149,6 +149,24 @@ fn main() {
 
     let mut diff = serde_json::to_value(diff).unwrap();
 
+    if let Some(test_cases) = args.get_many::<String>("test") {
+        // TODO : Multiple test arguments
+        let test_cases: Vec<_> = test_cases.collect();
+
+        let path = test_cases.get(0).unwrap();
+        let val = test_cases.get(1).unwrap();
+
+        diff.as_array_mut().unwrap().insert(0,
+            serde_json::json!(
+                {
+                    "op": "test",
+                    "path": path,
+                    "value": val
+                }
+            )
+        );
+    }
+
     if let Some(excludes) = args.get_many::<String>("exclude") {
         let excludes: Vec<String> = excludes.cloned().collect();
         diff = exclude_json_paths(&diff, &excludes);