Initial commit: CookIT recipe collection and week planner

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

test/planning/ingredient_totals_test.dart

@@ -0,0 +1,56 @@
+import 'package:cookit/src/planning/ingredient_totals.dart';
+import 'package:cookit/src/recipes/models/recipe.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../support/fixtures.dart';
+
+void main() {
+  Recipe withLines(String id, List<IngredientLine> lines) => recipe(
+    id: id,
+    ingredientGroups: [IngredientGroup(lines: lines)],
+  );
+
+  test('lines with the same name and Unit are added up, others stay apart', () {
+    final totals = ingredientTotals([
+      withLines('a', const [
+        IngredientLine(amount: 200, unitKey: 'gram', name: 'Butter'),
+        IngredientLine(amount: 2, name: 'Eier'),
+        IngredientLine(name: 'Salz'),
+      ]),
+      withLines('b', const [
+        IngredientLine(amount: 200, unitKey: 'gram', name: 'butter '),
+        IngredientLine(amount: 1, unitKey: 'tablespoon', name: 'Butter'),
+        IngredientLine(amount: 1, amountMax: 2, name: 'Eier'),
+        IngredientLine(name: 'Salz'),
+      ]),
+    ]);
+    expect(
+      [for (final l in totals) (l.amount, l.amountMax, l.unitKey, l.name)],
+      [
+        (400.0, null, 'gram', 'Butter'),
+        (3.0, 4.0, null, 'Eier'),
+        (null, null, null, 'Salz'),
+        (1.0, null, 'tablespoon', 'Butter'),
+      ],
+    );
+  });
+
+  test('a remark survives only when every line agrees', () {
+    final totals = ingredientTotals([
+      withLines('a', const [
+        IngredientLine(amount: 1, name: 'Zitrone', remark: 'bio'),
+        IngredientLine(amount: 1, name: 'Ei', remark: 'groß'),
+      ]),
+      withLines('b', const [
+        IngredientLine(amount: 1, name: 'Zitrone', remark: 'bio'),
+        IngredientLine(amount: 1, name: 'Ei'),
+      ]),
+    ]);
+    expect([for (final l in totals) l.remark], ['bio', null]);
+  });
+
+  test('the same Recipe planned twice counts twice', () {
+    final r = withLines('a', const [IngredientLine(amount: 100, unitKey: 'gram', name: 'Mehl')]);
+    expect(ingredientTotals([r, r]).single.amount, 200);
+  });
+}