added jspg_schemas for mixer

src/tests/mod.rs

@@ -49,6 +49,22 @@ fn test_library_api() {
     })
   );
 
+  // 3. Validate jspg_schemas
+  let schemas_drop = jspg_schemas();
+  assert_eq!(
+    schemas_drop.0,
+    json!({
+        "test_schema": {
+            "$id": "test_schema",
+            "type": "object",
+            "properties": {
+                "name": { "type": "string" }
+            },
+            "required": ["name"]
+        }
+    })
+  );
+
   // 4. Validate Happy Path
   let happy_drop = jspg_validate("test_schema", JsonB(json!({"name": "Neo"})));
   assert_eq!(