feat: add unit test for null config file

eth_validator_watcher/config.py

@@ -45,7 +45,7 @@ def load_config(config_file: str) -> Config:
     The effective configuration used by the watcher
     """
     with open(config_file, 'r') as fh:
-        config = yaml.safe_load(fh)
+        config = yaml.safe_load(fh) or dict()
 
         from_env = Config().model_dump()
         from_yaml = Config(**config).model_dump()

tests/config/assets/config.empty.yaml

@@ -1,10 +0,0 @@
-beacon_url: ~
-beacon_type: other
-execution_url: ~
-web3signer_url: ~
-default_fee_recipient: ~
-slack_channel: ~
-slack_token: ~
-relays: ~
-liveness_file: ~
-watched_keys: ~

tests/config/assets/config.null.yaml

@@ -0,0 +1,10 @@
+beacon_url: ~
+beacon_type: other
+execution_url: ~
+web3signer_url: ~
+default_fee_recipient: ~
+slack_channel: ~
+slack_token: ~
+relays: ~
+liveness_file: ~
+watched_keys: ~

tests/config/test_load_config.py

@@ -6,6 +6,22 @@
 from tests.config import assets
 
 
+def test_null_config() -> None:
+    path = Path(assets.__file__).parent / "config.null.yaml"
+    config = load_config(path)
+
+    assert config.beacon_url is None
+    assert config.execution_url is None
+    assert config.web3signer_url is None
+    assert config.default_fee_recipient is None
+    assert config.slack_channel is None
+    assert config.slack_token is None
+    assert config.beacon_type == BeaconType.OTHER
+    assert config.relays is None
+    assert config.liveness_file is None
+    assert config.watched_keys is None
+
+
 def test_empty_config() -> None:
     path = Path(assets.__file__).parent / "config.empty.yaml"
     config = load_config(path)