Initial commit: CookIT recipe collection and week planner

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

test/recipes/amount_test.dart

@@ -0,0 +1,47 @@
+import 'package:cookit/src/recipes/amount.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:intl/date_symbol_data_local.dart';
+
+void main() {
+  setUpAll(() => initializeDateFormatting('de'));
+
+  group('parseAmount', () {
+    final cases = <String, Amount?>{
+      '': (amount: null, amountMax: null),
+      '2': (amount: 2, amountMax: null),
+      '1,5': (amount: 1.5, amountMax: null),
+      '0.25': (amount: 0.25, amountMax: null),
+      '½': (amount: 0.5, amountMax: null),
+      '1½': (amount: 1.5, amountMax: null),
+      '1/2': (amount: 0.5, amountMax: null),
+      '1 1/2': (amount: 1.5, amountMax: null),
+      '2-3': (amount: 2, amountMax: 3),
+      '10 – 12': (amount: 10, amountMax: 12),
+      '1 bis 2': (amount: 1, amountMax: 2),
+      'etwas': null,
+      '2-': null,
+    };
+    cases.forEach((input, expected) {
+      test('"$input"', () => expect(parseAmount(input), expected));
+    });
+  });
+
+  group('formatAmount', () {
+    test('uses fraction glyphs and German decimals', () {
+      expect(formatAmount(1.5, null), '1½');
+      expect(formatAmount(0.25, null), '¼');
+      expect(formatAmount(0.333, null), '⅓');
+      expect(formatAmount(2, null), '2');
+      expect(formatAmount(1.4, null), '1,4');
+      expect(formatAmount(1000, null), '1.000');
+      expect(formatAmount(2, 3), '2–3');
+      expect(formatAmount(null, null), '');
+    });
+
+    test('round-trips through parseAmount', () {
+      for (final value in [0.5, 1.5, 2.0, 1.4, 250.0]) {
+        expect(parseAmount(formatAmount(value, null))!.amount, closeTo(value, 0.001));
+      }
+    });
+  });
+}