WIP tests for errors

tests/debugclient.nim

@@ -0,0 +1,18 @@
+include ../ eth-rpc / client
+import chronicles
+
+proc rawCall*(self: RpcClient, name: string,
+           msg: string): Future[Response] {.async.} =
+  # For debug purposes only
+  let id = $self.nextId
+  self.nextId.inc
+  debug "Sending message", msg = msg
+  let res = await self.transp.write(msg & "\c\l")
+  debug "Receiving length assert", value = res, length = len(msg), lengthDifferent = res != len(msg)
+
+  # completed by processMessage.
+  var newFut = newFuture[Response]()
+  # add to awaiting responses
+  self.awaiting[id] = newFut
+
+  result = await newFut

tests/testerrors.nim

@@ -0,0 +1,25 @@
+#[
+  This module uses debug versions of the rpc components that
+  allow unchecked and unformatted calls.
+]#
+
+import unittest, debugclient, ../rpcserver
+import strformat, chronicles
+
+var server = newRpcServer("localhost", 8547.Port)
+var client = newRpcClient()
+
+server.start()
+waitFor client.connect("localhost", Port(8547))
+
+server.rpc("rpc") do(a: int, b: int):
+  result = %(&"a: {a}, b: {b}")
+
+suite "RPC Errors":
+  test "Malformed json":
+    expect ValueError:
+      let
+        malformedJson = "{field: 2, \"field: 3}\n"
+        res = waitFor client.rawCall("rpc", malformedJson)
+      info "res", res
+