Merge pull request #10 from rubixchain/arnab/node-url-optional

`node_url` is made default

Author: arnabghose997

rubix/client.py

@@ -3,7 +3,7 @@
 from urllib.parse import urljoin
 
 class RubixClient:
-    def __init__(self, node_url: str, timeout: int = 300):
+    def __init__(self, node_url: str = "http://localhost:20000", timeout: int = 300):
         """
         Initialize Rubix client.
         

tests/test_client.py

@@ -8,3 +8,8 @@ def test_client_creation_with_valid_url():
     client = RubixClient(valid_node_url)
 
     assert client is not None
+
+    client_default_url = RubixClient()
+
+    assert client_default_url is not None
+    assert client_default_url.node_url == "http://localhost:20000", "Default node URL should be http://localhost:20000"