frontend/src/lib/shopping/AddCustomItem.test.ts

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+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import { userEvent } from '@testing-library/user-event';
+import AddCustomItem from './AddCustomItem.svelte';
+
+vi.mock('$app/forms', () => ({
+	enhance: () => ({ destroy: () => {} })
+}));
+
+describe('AddCustomItem', () => {
+	it('shows collapsed trigger button initially', () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		expect(screen.getByText(/Artikel hinzufügen/)).toBeInTheDocument();
+		expect(screen.queryByPlaceholderText('Artikelname')).not.toBeInTheDocument();
+	});
+
+	it('expands form when trigger button is clicked', async () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		expect(screen.getByPlaceholderText('Artikelname')).toBeInTheDocument();
+	});
+
+	it('collapses form when Abbrechen is clicked', async () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		expect(screen.getByPlaceholderText('Artikelname')).toBeInTheDocument();
+		await userEvent.click(screen.getByText('Abbrechen'));
+		expect(screen.queryByPlaceholderText('Artikelname')).not.toBeInTheDocument();
+	});
+
+	it('submit button is disabled when name is empty', async () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		expect(screen.getByRole('button', { name: /Hinzufügen/i })).toBeDisabled();
+	});
+
+	it('submit button is enabled when name is entered', async () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		await userEvent.type(screen.getByPlaceholderText('Artikelname'), 'Papier');
+		expect(screen.getByRole('button', { name: /Hinzufügen/i })).not.toBeDisabled();
+	});
+
+	it('form submits to ?/addItem action', async () => {
+		render(AddCustomItem, { props: { listId: 'list-1' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		const form = screen.getByPlaceholderText('Artikelname').closest('form')!;
+		expect(form).toHaveAttribute('action', '?/addItem');
+	});
+
+	it('form includes listId as hidden input', async () => {
+		render(AddCustomItem, { props: { listId: 'list-42' } });
+		await userEvent.click(screen.getByText(/Artikel hinzufügen/));
+		const form = screen.getByPlaceholderText('Artikelname').closest('form')!;
+		const listIdInput = form.querySelector('input[name="listId"]') as HTMLInputElement;
+		expect(listIdInput.value).toBe('list-42');
+	});
+});

frontend/src/lib/shopping/ChecklistItem.test.ts

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+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import ChecklistItem from './ChecklistItem.svelte';
+
+vi.mock('$app/forms', () => ({
+	enhance: () => ({ destroy: () => {} })
+}));
+
+describe('ChecklistItem', () => {
+	const baseProps = {
+		listId: 'list-1',
+		itemId: 'item-1',
+		name: 'Tomaten',
+		quantity: null,
+		unit: null,
+		isChecked: false,
+		sourceRecipes: []
+	};
+
+	it('renders the item name', () => {
+		render(ChecklistItem, { props: baseProps });
+		expect(screen.getByText('Tomaten')).toBeInTheDocument();
+	});
+
+	it('renders quantity and unit when provided', () => {
+		render(ChecklistItem, { props: { ...baseProps, quantity: 3, unit: 'Stück' } });
+		expect(screen.getByText('3 Stück')).toBeInTheDocument();
+	});
+
+	it('renders quantity without unit when unit is null', () => {
+		render(ChecklistItem, { props: { ...baseProps, quantity: 2, unit: null } });
+		expect(screen.getByText('2')).toBeInTheDocument();
+	});
+
+	it('applies line-through style when checked', () => {
+		render(ChecklistItem, { props: { ...baseProps, isChecked: true } });
+		const nameEl = screen.getByText('Tomaten');
+		expect(nameEl.className).toContain('line-through');
+	});
+
+	it('does not apply line-through when unchecked', () => {
+		render(ChecklistItem, { props: { ...baseProps, isChecked: false } });
+		const nameEl = screen.getByText('Tomaten');
+		expect(nameEl.className).not.toContain('line-through');
+	});
+
+	it('shows recipe label for source recipes when unchecked', () => {
+		render(ChecklistItem, {
+			props: {
+				...baseProps,
+				sourceRecipes: [{ id: 'r-1', name: 'Spaghetti' }]
+			}
+		});
+		expect(screen.getByText(/Für: Spaghetti/)).toBeInTheDocument();
+	});
+
+	it('hides recipe label when item is checked', () => {
+		render(ChecklistItem, {
+			props: {
+				...baseProps,
+				isChecked: true,
+				sourceRecipes: [{ id: 'r-1', name: 'Spaghetti' }]
+			}
+		});
+		expect(screen.queryByText(/Für:/)).not.toBeInTheDocument();
+	});
+
+	it('sets aria-checked to false when unchecked', () => {
+		render(ChecklistItem, { props: { ...baseProps, isChecked: false } });
+		const button = screen.getByRole('checkbox');
+		expect(button).toHaveAttribute('aria-checked', 'false');
+	});
+
+	it('sets aria-checked to true when checked', () => {
+		render(ChecklistItem, { props: { ...baseProps, isChecked: true } });
+		const button = screen.getByRole('checkbox');
+		expect(button).toHaveAttribute('aria-checked', 'true');
+	});
+
+	it('passes listId and itemId as hidden inputs', () => {
+		render(ChecklistItem, { props: baseProps });
+		const form = screen.getByRole('checkbox').closest('form')!;
+		const listIdInput = form.querySelector('input[name="listId"]') as HTMLInputElement;
+		const itemIdInput = form.querySelector('input[name="itemId"]') as HTMLInputElement;
+		expect(listIdInput.value).toBe('list-1');
+		expect(itemIdInput.value).toBe('item-1');
+	});
+});

frontend/src/lib/shopping/ShoppingHeader.test.ts

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+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import ShoppingHeader from './ShoppingHeader.svelte';
+
+vi.mock('$app/forms', () => ({
+	enhance: () => ({ destroy: () => {} })
+}));
+
+describe('ShoppingHeader', () => {
+	const baseProps = {
+		totalItems: 0,
+		checkedCount: 0,
+		generatedAt: null,
+		weekPlanId: null,
+		isPlanner: false,
+		hasShoppingList: false
+	};
+
+	it('renders the heading', () => {
+		render(ShoppingHeader, { props: baseProps });
+		expect(screen.getByText('Einkaufsliste')).toBeInTheDocument();
+	});
+
+	it('shows counts when hasShoppingList is true', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, totalItems: 5, checkedCount: 2, hasShoppingList: true }
+		});
+		expect(screen.getByText(/3 Artikel übrig/)).toBeInTheDocument();
+		expect(screen.getByText(/2 abgehakt/)).toBeInTheDocument();
+	});
+
+	it('does not show counts when hasShoppingList is false', () => {
+		render(ShoppingHeader, { props: { ...baseProps, hasShoppingList: false } });
+		expect(screen.queryByText(/Artikel übrig/)).not.toBeInTheDocument();
+	});
+
+	it('shows generate button for planner with weekPlanId', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, isPlanner: true, weekPlanId: 'plan-1' }
+		});
+		expect(screen.getByRole('button', { name: /Liste generieren/i })).toBeInTheDocument();
+	});
+
+	it('shows regenerate button when planner already has a list', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, isPlanner: true, weekPlanId: 'plan-1', hasShoppingList: true, totalItems: 3, checkedCount: 0 }
+		});
+		expect(screen.getByRole('button', { name: /Neu generieren/i })).toBeInTheDocument();
+	});
+
+	it('hides generate button for non-planner', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, isPlanner: false, weekPlanId: 'plan-1' }
+		});
+		expect(screen.queryByRole('button', { name: /generieren/i })).not.toBeInTheDocument();
+	});
+
+	it('hides generate button when weekPlanId is null', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, isPlanner: true, weekPlanId: null }
+		});
+		expect(screen.queryByRole('button', { name: /generieren/i })).not.toBeInTheDocument();
+	});
+
+	it('shows formatted timestamp when generatedAt is provided', () => {
+		render(ShoppingHeader, {
+			props: { ...baseProps, hasShoppingList: true, generatedAt: '2026-04-06T10:30:00Z', totalItems: 1, checkedCount: 0 }
+		});
+		expect(screen.getByText(/erstellt/)).toBeInTheDocument();
+	});
+});