platform/packages/configuration/test/all_test.dart

import 'package:angel_framework/angel_framework.dart';
import 'package:angel_configuration/angel_configuration.dart';
import 'package:file/local.dart';
import 'package:io/ansi.dart';
import 'package:test/test.dart';

main() async {
  // Note: Set ANGEL_ENV to 'development'
  var app = new Angel();
  var fileSystem = const LocalFileSystem();

  await app.configure(configuration(
    fileSystem,
    directoryPath: './test/config',
  ));

  test('standalone', () async {
    var config = await loadStandaloneConfiguration(
      fileSystem,
      directoryPath: './test/config',
      onWarning: (msg) {
        print(yellow.wrap('STANDALONE WARNING: $msg'));
      },
    );
    print('Standalone: $config');
    expect(config, {
      "angel": {"framework": "cool"},
      "must_be_null": null,
      "artist": "Timberlake",
      "merge": {"map": true, "hello": "world"},
      "set_via": "default",
      "hello": "world",
      "foo": {"version": "bar"}
    });
  });

  test('can load based on ANGEL_ENV', () async {
    expect(app.configuration['hello'], equals('world'));
    expect(app.configuration['foo']['version'], equals('bar'));
  });

  test('will load default.yaml if exists', () {
    expect(app.configuration["set_via"], equals("default"));
  });

  test('will load .env if exists', () {
    expect(app.configuration['artist'], 'Timberlake');
    expect(app.configuration['angel'], {'framework': 'cool'});
  });

  test('non-existent environment defaults to null', () {
    expect(app.configuration.keys, contains('must_be_null'));
    expect(app.configuration['must_be_null'], null);
  });

  test('can override ANGEL_ENV', () async {
    await app.configure(configuration(fileSystem,
        directoryPath: './test/config', overrideEnvironmentName: 'override'));
    expect(app.configuration['hello'], equals('goodbye'));
    expect(app.configuration['foo']['version'], equals('baz'));
  });

  test('merges configuration', () async {
    await app.configure(configuration(fileSystem,
        directoryPath: './test/config', overrideEnvironmentName: 'override'));
    expect(app.configuration['merge'], {'map': true, 'hello': 'goodbye'});
  });
}