Unit testing with dart's shelf_rest - unit-testing

Question

I'm trying to test a Dart REST app run on shelf_rest. Assuming a setup similar to the shelf_rest example, how can one test the configured routes without actually running an HTTP server?
import 'package:shelf/shelf.dart';
import 'package:shelf/shelf_io.dart' as io;
import 'package:shelf_rest/shelf_rest.dart';
void main() {
var myRouter = router()
..get('/accounts/{accountId}', (Request request) {
var account = new Account.build(accountId: getPathParameter(request, 'accountId'));
return new Response.ok(JSON.encode(account));
});
io.serve(myRouter.handler, 'localhost', 8080);
}
class Account {
final String accountId;
Account.build({this.accountId});
Account.fromJson(Map json) : this.accountId = json['accountId'];
Map toJson() => {'accountId': accountId};
}
class AccountResource {
#Get('{accountId}')
Account find(String accountId) => new Account.build(accountId: accountId);
}
Without getting into too much additional logic, how could the GET account endpoint be unit tested? Some basic tests I'd like to run would be:
GET /accounts/123 returns 200
GET /accounts/bogus returns 404

Answer 1

To create a unit test (i.e. without a running server) then you need to split myRouter outside of the main function and put it in a file in the lib dir. e.g
import 'dart:convert';
import 'package:shelf/shelf.dart';
import 'package:shelf_rest/shelf_rest.dart';
var myRouter = router()
..get('/accounts/{accountId}', (Request request) {
var account =
new Account.build(accountId: getPathParameter(request, 'accountId'));
return new Response.ok(JSON.encode(account));
});
class Account {
final String accountId;
Account.build({this.accountId});
Account.fromJson(Map json) : this.accountId = json['accountId'];
Map toJson() => {'accountId': accountId};
}
Then create a test file in the test directory and test like
import 'package:soQshelf_rest/my_router.dart';
import 'package:test/test.dart';
import 'package:shelf/shelf.dart';
import 'dart:convert';
main() {
test('/account/{accountId} should return expected response', () async {
final Handler handler = myRouter.handler;
final Response response = await handler(
new Request('GET', Uri.parse('http://localhost:9999/accounts/123')));
expect(response.statusCode, equals(200));
expect(JSON.decode(await response.readAsString()),
equals({"accountId": "123"}));
});
}