the-mews/app/test/mews_urls_test.dart

import 'package:flutter_test/flutter_test.dart';

import 'package:mews/application/pages/mews_urls.dart';

void main() {
  group('isInternal', () {
    test('recognizes the mews scheme only', () {
      expect(MewsUrls.isInternal('mews:hub'), isTrue);
      expect(MewsUrls.isInternal('mews:'), isTrue);
      expect(MewsUrls.isInternal('https://example.test/'), isFalse);
      expect(MewsUrls.isInternal('not a url at all'), isFalse);
    });
  });

  group('isAction', () {
    test('accepts exactly one verb under do/', () {
      expect(MewsUrls.isAction('mews:do/set-theme?value=dark'), isTrue);
      expect(MewsUrls.isAction('mews:do/clear-history'), isTrue);
    });

    test('rejects pages, bare do and deeper paths', () {
      expect(MewsUrls.isAction('mews:settings'), isFalse);
      expect(MewsUrls.isAction('mews:do'), isFalse);
      expect(MewsUrls.isAction('mews:do/a/b'), isFalse);
      // A fetched page must not reach the dispatcher by mimicking the path.
      expect(MewsUrls.isAction('https://example.test/do/clear-history'), isFalse);
    });

    test('verbOf reads the verb back', () {
      expect(MewsUrls.verbOf('mews:do/set-size?step=up'), 'set-size');
      expect(MewsUrls.verbOf('mews:settings'), isNull);
    });
  });

  group('canonical', () {
    test('bare mews: is the hub', () {
      expect(MewsUrls.canonical('mews:'), MewsUrls.hub);
    });

    test('keeps a query string and drops a fragment', () {
      expect(MewsUrls.canonical('mews:bookmarks?tag=phones'),
          'mews:bookmarks?tag=phones');
      expect(MewsUrls.canonical('mews:settings#colors'), 'mews:settings');
    });

    test('leaves external addresses alone', () {
      expect(MewsUrls.canonical('https://example.test/a?b=c'),
          'https://example.test/a?b=c');
    });
  });

  group('action', () {
    test('builds an address the dispatcher accepts', () {
      final url = MewsUrls.action('set-theme', {'value': 'dark'});
      expect(url, 'mews:do/set-theme?value=dark');
      expect(MewsUrls.isAction(url), isTrue);
    });

    test('round-trips a url carried inside the query string', () {
      // Every per-item action names its target this way, so the inner address
      // must survive encoding untouched.
      const target = 'https://example.test/p?q=1&r=2';
      final url = MewsUrls.action('remove-bookmark', {'url': target});
      expect(Uri.parse(url).queryParameters['url'], target);
      expect(MewsUrls.isAction(url), isTrue);
    });

    test('takes no query string when there are no arguments', () {
      expect(MewsUrls.action('clear-history'), 'mews:do/clear-history');
    });
  });

  group('page', () {
    test('merges over the existing parameters', () {
      final url = MewsUrls.page(Uri.parse('mews:bookmarks?tag=phones'),
          {'q': 'retro'});
      final params = Uri.parse(url).queryParameters;
      expect(params, {'tag': 'phones', 'q': 'retro'});
    });

    test('an empty value drops the parameter', () {
      final url =
          MewsUrls.page(Uri.parse('mews:bookmarks?tag=phones&q=retro'), {'q': ''});
      expect(Uri.parse(url).queryParameters, {'tag': 'phones'});
    });

    test('drops the query string once nothing is left', () {
      final url = MewsUrls.page(Uri.parse('mews:bookmarks?q=retro'), {'q': ''});
      expect(url, 'mews:bookmarks');
    });

    test('survives a value needing escapes', () {
      final url = MewsUrls.page(Uri.parse(MewsUrls.bookmarks), {'q': 'a b&c=d'});
      expect(Uri.parse(url).queryParameters['q'], 'a b&c=d');
      expect(MewsUrls.canonical(url), url);
    });
  });
}