feat(dictionary): a German verb is found with its particle at the clause's end

"Ich rufe dich morgen an": where a clause ends in a separable particle,
each word before it is also asked for with the particle joined on, as a
subordinate clause writes the verb (anrufe), which Wiktionary lists among
anrufen's forms. The verb is offered beside its stem and its particle,
as the longer words running over a Japanese word are.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/test/feature/dictionary/german_words_test.dart

@@ -0,0 +1,48 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_learn_flutter/src/feature/dictionary/model/dictionary.dart';
+import 'package:halkyon_learn_flutter/src/feature/dictionary/model/german_words.dart';
+
+import '../../support/fake_dictionary_gateway.dart';
+
+void main() {
+  final anrufen = germanWord(
+    'anrufen',
+    pos: 'verb',
+    glosses: ['to call'],
+    forms: ['anrufe', 'anruft', 'anrief'],
+  );
+  final rufen = germanWord('rufen', pos: 'verb', glosses: ['to shout']);
+  final an = germanWord('an', pos: 'preposition', glosses: ['at']);
+
+  test('a clause ending in a separable particle asks for each word before '
+      'it with the particle joined on, as subordinate clauses write it', () {
+    final keys = germanSentenceKeys('Ich rufe dich morgen an.');
+
+    expect(keys, containsAll(['ich', 'rufe', 'an', 'anrufe', 'anich']));
+    // Only where a particle ends the clause.
+    expect(germanSentenceKeys('Ich rufe dich.'), isNot(contains('anrufe')));
+  });
+
+  test('the separated verb is offered beside its stem and its particle; '
+      'clauses each on their own', () {
+    final found = <String, List<DictionaryItem>>{
+      'rufe': [rufen],
+      'an': [an],
+      'anrufe': [anrufen],
+    };
+
+    final parts = germanSentenceParts(
+      'Ich rufe dich morgen an, dann gehe ich.',
+      found,
+    );
+
+    final stem = parts.singleWhere((part) => part.text == 'rufe');
+    expect(stem.entries, [rufen]);
+    expect(stem.wider.single.entries, [anrufen]);
+    expect(stem.wider.single.text, 'rufe … an');
+    final particle = parts.singleWhere((part) => part.text == 'an');
+    expect(particle.wider.single.entries, [anrufen]);
+    // The particle's place in the line is where it stands.
+    expect(particle.start, 'Ich rufe dich morgen '.length);
+  });
+}

halkyon_learn_flutter/test/feature/dictionary/spaced_words_test.dart

@@ -114,7 +114,7 @@ void main() {
 
   test('Japanese is cut by its longest words, the rest at their spaces', () {
     expect(WordCutting.of('ja'), WordCutting.longestJapanese);
-    expect(WordCutting.of('de'), WordCutting.spaces);
+    expect(WordCutting.of('de'), WordCutting.spacesGerman);
     expect(WordCutting.of('el'), WordCutting.spaces);
     expect(WordCutting.of('en-GB'), WordCutting.spaces);
   });