Update the News source catalog for quality (#5)

Adds Techmeme, Lobsters, The Decoder and Simon Willison, all on by default.
Hacker News now reads hnrss.org's front page with 150+ points. t3n,
ComputerBase, TechCrunch and The Verge stay in the catalog but are off by
default. heise Security and heise Developer are described as sections of
heise online. WIRED and Engadget are removed.

Saved toggles for Sources that are no longer in the catalog are dropped on
launch, so they don't count towards "n of m enabled". The README source
table matches the catalog.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/default_sources_test.dart

@@ -0,0 +1,51 @@
+import 'package:daily_tech_news/data/default_sources.dart';
+import 'package:daily_tech_news/models/news_source.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+NewsSource _byId(String id) => defaultSources.singleWhere((s) => s.id == id);
+
+void main() {
+  test('the News sources on by default are the curated quality set', () {
+    final onByDefault = {
+      for (final s in defaultSources)
+        if (s.enabledByDefault) s.id,
+    };
+
+    expect(onByDefault, {
+      'heise', 'golem', 'arstechnica', 'hackernews',
+      'techmeme', 'lobsters', 'the-decoder', 'simonwillison',
+    });
+  });
+
+  test('the added Sources read the agreed feeds', () {
+    final feeds = {
+      for (final id in ['techmeme', 'lobsters', 'the-decoder', 'simonwillison'])
+        id: (_byId(id).feedUrl, _byId(id).language),
+    };
+
+    expect(feeds, {
+      'techmeme': ('https://www.techmeme.com/feed.xml', SourceLanguage.en),
+      'lobsters': ('https://lobste.rs/rss', SourceLanguage.en),
+      'the-decoder': ('https://the-decoder.de/feed/', SourceLanguage.de),
+      'simonwillison': ('https://simonwillison.net/atom/entries/', SourceLanguage.en),
+    });
+  });
+
+  test('Hacker News only brings well-voted front page stories', () {
+    expect(_byId('hackernews').feedUrl, 'https://hnrss.org/frontpage?points=150');
+  });
+
+  test('switched-off Sources stay in the catalog, WIRED and Engadget are gone', () {
+    final ids = defaultSources.map((s) => s.id).toSet();
+
+    expect(ids, containsAll(['t3n', 'computerbase', 'techcrunch', 'verge']));
+    expect(ids, isNot(contains('wired')));
+    expect(ids, isNot(contains('engadget')));
+  });
+
+  test('every Source has its own id', () {
+    final ids = defaultSources.map((s) => s.id).toList();
+
+    expect(ids.toSet().length, ids.length);
+  });
+}

test/source_selection_test.dart

@@ -78,12 +78,32 @@ void main() {
   test('an install from before the app remembered seen Sources keeps its toggles', () async {
     // Toggles saved by an earlier version: golem, t3n and others switched off.
     SharedPreferences.setMockInitialValues({
-      'enabled_sources': ['heise', 'verge', 'wired'],
+      'enabled_sources': ['heise', 'verge', 'mit-tr'],
     });
 
     final newSource = _source('new-source', onByDefault: true);
     final state = await _launch([...defaultSources, newSource]);
 
-    expect(state.enabledSourceIds, {'heise', 'verge', 'wired', 'new-source'});
+    expect(state.enabledSourceIds, {
+      'heise', 'verge', 'mit-tr', 'new-source',
+      // Added to the catalog later, on by default.
+      'techmeme', 'lobsters', 'the-decoder', 'simonwillison',
+    });
+  });
+
+  test('an install from before the catalog update gets the new Sources and drops removed ones',
+      () async {
+    // Toggles saved by an earlier version, with WIRED and Engadget switched on.
+    SharedPreferences.setMockInitialValues({
+      'enabled_sources': ['heise', 'golem', 't3n', 'verge', 'wired', 'engadget'],
+    });
+
+    final state = await _launch(defaultSources);
+
+    expect(state.enabledSourceIds, {
+      'heise', 'golem', 't3n', 'verge',
+      'techmeme', 'lobsters', 'the-decoder', 'simonwillison',
+    });
+    expect(state.enabledSources.map((s) => s.id), isNot(contains('wired')));
   });
 }