rpc: trivial eth_accounts implementation

Author: carver

tests/trinity/core/json-rpc/test_ipc.py

@@ -85,6 +85,10 @@ async def get_ipc_response(
             build_request('notamethod'),
             {'error': "Invalid RPC method: 'notamethod'", 'id': 3, 'jsonrpc': '2.0'},
         ),
+        (
+            build_request('eth_accounts'),
+            {'result': [], 'id': 3, 'jsonrpc': '2.0'},
+        ),
         (
             build_request('eth_mining'),
             {'result': False, 'id': 3, 'jsonrpc': '2.0'},

trinity/rpc/modules/eth.py

@@ -125,8 +125,9 @@ class Eth(RPCModule):
     Any attribute without an underscore is publicly accessible.
     '''
 
-    def accounts(self) -> None:
-        raise NotImplementedError()
+    def accounts(self) -> List[str]:
+        # trinity does not manage accounts for the user
+        return []
 
     def blockNumber(self) -> str:
         num = self._chain.get_canonical_head().block_number