From 4b87dbf0875862640364d41f37927d2fd7ea77b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christopher=20M=C3=BChl?= <toki@toph.so>
Date: Wed, 8 Apr 2026 15:33:55 +0200
Subject: [PATCH] test(04-02): click navigation tests for cell callback and
 init URL construction

---
 assets/test/interaction.test.ts | 144 ++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 assets/test/interaction.test.ts

diff --git a/assets/test/interaction.test.ts b/assets/test/interaction.test.ts
new file mode 100644
index 0000000..be37a54
--- /dev/null
+++ b/assets/test/interaction.test.ts
@@ -0,0 +1,144 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { renderHeatmap, init } from '../src/heatmap';
+import type { HeatmapData } from '../src/types';
+
+const MOCK_DATA: HeatmapData = {
+  days: [
+    { date: '2025-01-06', hours: 2.5, count: 3 },
+    { date: '2025-01-07', hours: 5.0, count: 5 },
+  ],
+  range: { begin: '2025-01-01', end: '2025-01-14' },
+};
+
+describe('click navigation', () => {
+  let container: HTMLDivElement;
+
+  beforeEach(() => {
+    container = document.createElement('div');
+    document.body.appendChild(container);
+  });
+
+  afterEach(() => {
+    document.body.removeChild(container);
+    vi.restoreAllMocks();
+  });
+
+  it('calls onCellClick with dateStr when a data cell is clicked', () => {
+    const onClick = vi.fn();
+    renderHeatmap(container, MOCK_DATA, undefined, onClick);
+    const cell = container.querySelector('rect.heatmap-cell:not(.heatmap-empty)') as SVGRectElement;
+    cell.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    expect(onClick).toHaveBeenCalledOnce();
+    expect(onClick.mock.calls[0][0]).toMatch(/^\d{4}-\d{2}-\d{2}$/);
+  });
+
+  it('calls onCellClick when an empty cell is clicked', () => {
+    const onClick = vi.fn();
+    renderHeatmap(container, MOCK_DATA, undefined, onClick);
+    const emptyCell = container.querySelector('rect.heatmap-empty') as SVGRectElement;
+    emptyCell.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    expect(onClick).toHaveBeenCalledOnce();
+  });
+
+  it('does not throw when no onCellClick provided', () => {
+    renderHeatmap(container, MOCK_DATA);
+    const cell = container.querySelector('rect.heatmap-cell') as SVGRectElement;
+    expect(() => cell.dispatchEvent(new MouseEvent('click', { bubbles: true }))).not.toThrow();
+  });
+
+  it('all cells have heatmap-cell class for cursor styling', () => {
+    renderHeatmap(container, MOCK_DATA);
+    const allRects = container.querySelectorAll('rect.heatmap-cell');
+    expect(allRects.length).toBeGreaterThan(0);
+    allRects.forEach((rect) => {
+      expect(rect.classList.contains('heatmap-cell')).toBe(true);
+    });
+  });
+});
+
+describe('init click navigation', () => {
+  let container: HTMLDivElement;
+  let locationHref: string;
+  const originalLocation = window.location;
+
+  beforeEach(() => {
+    container = document.createElement('div');
+    container.setAttribute('data-url', '/heatmap/data');
+    container.setAttribute('data-timesheet-url', '/en/timesheet/');
+    container.setAttribute('data-projects', '[]');
+    document.body.appendChild(container);
+
+    locationHref = '';
+    Object.defineProperty(window, 'location', {
+      value: {
+        ...originalLocation,
+        get href() { return locationHref; },
+        set href(v: string) { locationHref = v; },
+      },
+      writable: true,
+      configurable: true,
+    });
+
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(MOCK_DATA),
+    }));
+  });
+
+  afterEach(() => {
+    document.body.removeChild(container);
+    Object.defineProperty(window, 'location', {
+      value: originalLocation,
+      writable: true,
+      configurable: true,
+    });
+    vi.restoreAllMocks();
+  });
+
+  it('navigates to timesheet URL with daterange on cell click', async () => {
+    init(container);
+    await vi.waitFor(() => {
+      expect(container.querySelector('rect.heatmap-cell')).not.toBeNull();
+    });
+    const cell = container.querySelector('rect.heatmap-cell:not(.heatmap-empty)') as SVGRectElement;
+    cell.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    expect(locationHref).toContain('/en/timesheet/?daterange=');
+    expect(locationHref).toMatch(/daterange=.*\d{4}-\d{2}-\d{2}.*-.*\d{4}-\d{2}-\d{2}/);
+  });
+
+  it('includes project filter in navigation URL when active', async () => {
+    container.setAttribute('data-projects', JSON.stringify([{ id: 5, name: 'Test Project' }]));
+    init(container);
+    await vi.waitFor(() => {
+      expect(container.querySelector('rect.heatmap-cell')).not.toBeNull();
+    });
+
+    // Select the project in the dropdown
+    const select = container.querySelector('select.form-select') as HTMLSelectElement;
+    select.value = '5';
+    select.dispatchEvent(new Event('change'));
+
+    // Wait for re-render after filter fetch
+    await vi.waitFor(() => {
+      expect(fetch).toHaveBeenCalledTimes(2);
+    });
+    await vi.waitFor(() => {
+      expect(container.querySelector('rect.heatmap-cell')).not.toBeNull();
+    });
+
+    const cell = container.querySelector('rect.heatmap-cell:not(.heatmap-empty)') as SVGRectElement;
+    cell.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    expect(locationHref).toContain('projects[]=5');
+  });
+
+  it('falls back to /en/timesheet/ without data-timesheet-url', async () => {
+    container.removeAttribute('data-timesheet-url');
+    init(container);
+    await vi.waitFor(() => {
+      expect(container.querySelector('rect.heatmap-cell')).not.toBeNull();
+    });
+    const cell = container.querySelector('rect.heatmap-cell:not(.heatmap-empty)') as SVGRectElement;
+    cell.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    expect(locationHref).toContain('/en/timesheet/');
+  });
+});