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Connectum API Reference / @connectum/testing / index / assertConnectError

Function: assertConnectError() ​

assertConnectError(error, expectedCode, messagePattern?): asserts error is ConnectError

Defined in: assertions.ts:44

Assert that a thrown value is a ConnectError with the expected gRPC status code and, optionally, a message matching a pattern.

This is a TypeScript assertion function: after a successful call the compiler narrows error to ConnectError.

Note on message format: ConnectError messages include a code prefix, e.g. [not_found] user not found. The messagePattern is matched against the full message string. Use a RegExp for flexible matching.

Parameters ​

error ​

unknown

The value to check (typically from a catch block).

expectedCode ​

Code

Expected gRPC/Connect status code.

messagePattern? ​

Optional substring or RegExp to match against error.message.

string | RegExp

Returns ​

asserts error is ConnectError

Throws ​

When any of the checks fail.

Example ​

ts
import { Code, ConnectError } from "@connectrpc/connect";
import { assertConnectError } from "@connectum/testing";

try {
  await client.getUser({ id: "missing" });
} catch (err) {
  assertConnectError(err, Code.NotFound, "user not found");
  // err is now typed as ConnectError
  console.log(err.code); // Code.NotFound
}