feat: Unknown lookup status of a path in certificate yields AgentError

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+* The `Unknown` lookup of a request_status path in a certificate results in an `AgentError` (the IC returns `Absent` for non-existing paths).
+
 ## [0.27.0] - 2023-08-30
 
 * Breaking change: Remove argument builder form `ic-utils`. `CallBuilder::with_arg` sets a single argument, instead of pushing a new argument to the list. This function can be called at most once. If it's called multiple times, it panics. If you have multiple arguments, use `CallBuilder::with_args((arg1, arg2))` or `CallBuilder::set_raw_arg(candid::Encode!(arg1, arg2)?)`.

ic-agent/src/agent/response_authentication.rs

@@ -67,7 +67,7 @@ pub(crate) fn lookup_request_status<Storage: AsRef<[u8]>>(
     ];
     match certificate.tree.lookup_path(&path_status) {
         LookupResult::Absent => Ok(RequestStatusResponse::Unknown),
-        LookupResult::Unknown => Ok(RequestStatusResponse::Unknown),
+        LookupResult::Unknown => Err(LookupPathUnknown(path_status.to_vec())),
         LookupResult::Found(status) => match from_utf8(status)? {
             "done" => Ok(RequestStatusResponse::Done),
             "processing" => Ok(RequestStatusResponse::Processing),