fail fast if self-delegation cant be found + remove unused function

Author: randy-cro

integration_tests/test_staking_cache.py

@@ -35,12 +35,6 @@ def cronos_staking_cache(tmp_path_factory):
         Path(__file__).parent / "configs/staking_cache.jsonnet",
     )
 
-
-def get_validator_address(cli, node_index):
-    """Get validator address for a specific node."""
-    return cli.address("validator", bech="val")
-
-
 def get_delegator_address(cli, account_name):
     """Get delegator address for a specific account."""
     return cli.address(account_name)
@@ -566,6 +560,14 @@ def test_staking_cache_unbonding_validator(cronos_staking_cache):
                 print(msg)
 
                 break
+        else:
+            pytest.fail(
+                f"Validator self-delegation entry for {val_addr} missing in response."
+            )
+    else:
+        pytest.fail(
+            f"Failed to fetch self-delegations for {val_account} before unbonding."
+        )
 
     print("\n=== Test completed successfully ===")