Function expectControllerError

Narrow a ComplyTestControllerResponse to the ControllerError arm and assert its error code. Throws an Error with a descriptive message when the response is success-shaped or when the code does not match.

Returns the narrowed error so callers can make further assertions on error_detail / current_state without re-casting.

const result = await handleTestControllerRequest(store, {
  scenario: 'force_account_status',
  params: {},
});
const err = expectControllerError(result, 'INVALID_PARAMS');
assert.match(err.error_detail, /account_id/);
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