From 123d9812bc8c49f1e7808373c217f42b3d0a8c10 Mon Sep 17 00:00:00 2001
From: Knacky <knckydev@gmail.com>
Date: Mon, 8 Jun 2026 18:20:29 +0200
Subject: [PATCH] test: cover Content-Disposition fallback in
 ExportEngagementButton

---
 frontend/tests/exports.test.ts | 67 ++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 frontend/tests/exports.test.ts

diff --git a/frontend/tests/exports.test.ts b/frontend/tests/exports.test.ts
new file mode 100644
index 0000000..368b285
--- /dev/null
+++ b/frontend/tests/exports.test.ts
@@ -0,0 +1,67 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import MockAdapter from 'axios-mock-adapter';
+import { apiClient } from '@/api/client';
+import { downloadEngagementExport } from '@/api/exports';
+
+describe('downloadEngagementExport — Content-Disposition fallback', () => {
+  let mock: MockAdapter;
+  let capturedAnchor: HTMLAnchorElement | null = null;
+
+  beforeEach(() => {
+    mock = new MockAdapter(apiClient);
+    capturedAnchor = null;
+
+    globalThis.URL.createObjectURL = vi.fn().mockReturnValue('blob:fake-url');
+    globalThis.URL.revokeObjectURL = vi.fn();
+
+    const origCreateElement = document.createElement.bind(document);
+    vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+      const el = origCreateElement(tag);
+      if (tag === 'a') {
+        capturedAnchor = el as HTMLAnchorElement;
+        vi.spyOn(el as HTMLAnchorElement, 'click').mockImplementation(() => {});
+      }
+      return el;
+    });
+
+    vi.spyOn(document.body, 'appendChild').mockImplementation((node) => node);
+    vi.spyOn(document.body, 'removeChild').mockImplementation((node) => node);
+  });
+
+  afterEach(() => {
+    mock.restore();
+    vi.restoreAllMocks();
+  });
+
+  it('uses fallback filename engagement-{id}.md when Content-Disposition is absent', async () => {
+    mock.onGet('/engagements/42/export').reply(200, new Blob(['# test']), {
+      'content-type': 'text/markdown',
+    });
+
+    await downloadEngagementExport(42, 'md');
+
+    expect(capturedAnchor?.download).toBe('engagement-42.md');
+  });
+
+  it('uses fallback filename engagement-{id}.csv when Content-Disposition is malformed (no filename=)', async () => {
+    mock.onGet('/engagements/7/export').reply(200, new Blob(['col1,col2']), {
+      'content-type': 'text/csv',
+      'content-disposition': 'attachment',
+    });
+
+    await downloadEngagementExport(7, 'csv');
+
+    expect(capturedAnchor?.download).toBe('engagement-7.csv');
+  });
+
+  it('uses filename from Content-Disposition when header is well-formed', async () => {
+    mock.onGet('/engagements/5/export').reply(200, new Blob(['data']), {
+      'content-type': 'application/pdf',
+      'content-disposition': 'attachment; filename="engagement-5-slug-20260101.pdf"',
+    });
+
+    await downloadEngagementExport(5, 'pdf');
+
+    expect(capturedAnchor?.download).toBe('engagement-5-slug-20260101.pdf');
+  });
+});