letha11/sia-app

Unofficial SIA Mercubuana App

An Unofficial SIA app for Mercubuana University students

About The Project

I've got some minor issues with the SIA Mercubuana University website which are:

You need to log in every 30 minutes or so
The website sometime having an issue with the server so you cannot access it
No mobile application

And so i decided to build the application with an extra feature that fix those issues that i've listed above. Since SIA of Mercubuana University doesn't provide any API, so i need to scrape the data in order to built this application sia-mercu-scraping that also fix the issues that i've already mentioned above.

Built With

Frontend

Backend

Getting Started

Installation

Clone the repo

git clone https://github.com/letha11/sia-app

Install all dependencies
```
flutter pub get
```
Make sure you are connected with emulator or android devices. Keep in mind that this application support 2 type of environment, which are DEV and PROD. You can define those environment by specifying APP_ENV with --dart-define.
```
# DEV Environment
flutter run --dart-define=APP_ENV=DEV

# PROD Environment
flutter run --dart-define=APP_ENV=PROD
```

Troubles I've stumbled upon when buidling this app

Assertion Error with http_mock_adapter package

Since this is my first time testing a Dio package so im kinda confused on how to make things testable using Dio package. With a quick google search, i've read that i should use http_mock_adapter package to emulate a response from Dio. And so i used it.

but then when i try to mock my request with a post method to a /login endpoint of my backend, it throws an error like this:

  DioException [unknown]: null
  Error: Assertion failed: "Could not find mocked route matching request for POST /login { data: {dummy: dummy}, query parameters: {}, headers: {content-type: application/json, content-length: 17} }"
  package:dio/src/dio_mixin.dart 509:7  DioMixin.fetch

Could not find mocked route matching request for POST /login { data: {dummy: dummy}, query parameters: {}, headers: {content-type: application/json, content-length: 17} }

This happend because when i initialize my DioAdapter from the http_mock_adapter package, i didn't specify the matcher, by default if matcher arguments are not specified it will be filled with an FullHttpRequestMatcher().

// [FullHttpRequestMatcher] is a default matcher class
// (which actually means you haven't to pass it manually) that matches entire URL.
//
// Use [UrlRequestMatcher] for matching request based on the path of the URL.
//
// Or create your own http-request matcher via extending your class from  [HttpRequestMatcher].
// See -> issue:[124] & pr:[125]

Because of that when i'm trying to stub my request:

  dioAdapter.onPost(
	  "/login", (server) => server.reply(200, {'token': 'asd'}, delay: const Duration(seconds: 1)));

It will throw an assertion failed error, because the matchers are FullHttpRequestMatcher() so it will try to match the whole request, be it the data passed and other things, and also my implementation of the request to /login endpoint are like this:

try {
  final response = await _dioClient.dio.post(
	'/login',
	data: {
	  username: username,
	  password: password,
	},
  );

  if(response.statusCode == 400) return Left(InvalidInput());
  if(response.statusCode == 401) return Left(InvalidCredentials());

  final String token = response.data['token'];

  return Right(token);
} catch (e) {
  return Left(Failure());
}

So it makes sense that it throws an error, because the stubbed post method are not actually the same with the implementations such as no data stubbed.

Solution

I think you can copy 1 to 1 and match the stubbed method with your implementation, but I'm too lazy to do that, so there are others way such as using UrlRequestMatcher so that the only things that the adapter look up for asserting are only the url.

dioAdapter = DioAdapter(dio: dio, matcher: const UrlRequestMatcher());

letha11 / sia-app