test: fix the Suspect sources tests CI rejected (#5410)

- staticcheck QF1001: the nil-vs-empty check in TestSourceMarkersFor is
  now an early continue instead of a negated conjunction.
- The page test mocks #lib/api/admin.js whole, so suspectSourcesNextOffset
  was undefined there. Its test moves to admin.suspect-sources.test.ts,
  beside admin.scan.test.ts, against the real module.

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

internal/api/admin_suspect_sources_test.go

@@ -39,7 +39,10 @@ func TestSourceMarkersFor(t *testing.T) {
 	}
 	for _, c := range cases {
 		got := sourceMarkersFor("/music/x/" + c.base)
-		if !slices.Equal(got, c.want) && !(len(got) == 0 && len(c.want) == 0) {
+		if len(got) == 0 && len(c.want) == 0 {
+			continue // nil and empty both mean "no markers"
+		}
+		if !slices.Equal(got, c.want) {
 			t.Errorf("%s:\n  got  %v\n  want %v", c.base, got, c.want)
 		}
 	}

web/src/lib/api/admin.suspect-sources.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, test } from 'vitest';
+import { suspectSourcesNextOffset } from './admin';
+import type { AdminSuspectResponse, AdminSuspectTrack } from './types';
+
+function track(id: string): AdminSuspectTrack {
+  return {
+    track_id: id,
+    title: id,
+    artist_id: 'ar',
+    artist_name: 'Artist',
+    album_id: 'al',
+    album_title: 'Album',
+    file_path: `/music/${id}.mp3`,
+    duration_sec: 180,
+    disc_number: null,
+    track_number: null,
+    markers: []
+  };
+}
+
+function page(offset: number, total: number): AdminSuspectResponse {
+  return {
+    total,
+    limit: 50,
+    offset,
+    groups: [
+      { directory: 'a', tracks: [track('1'), track('2')] },
+      { directory: 'b', tracks: [track('3')] }
+    ]
+  };
+}
+
+// limit and total are in tracks, so the next offset must count tracks across
+// groups, not the number of groups.
+describe('suspectSourcesNextOffset', () => {
+  test('counts tracks, not groups', () => {
+    expect(suspectSourcesNextOffset(page(0, 10))).toBe(3);
+  });
+
+  test('stops at the total', () => {
+    expect(suspectSourcesNextOffset(page(7, 10))).toBeUndefined();
+  });
+});

web/src/routes/admin/suspect-sources/suspect-sources.test.ts

@@ -9,7 +9,6 @@ vi.mock('#lib/api/admin.js', () => ({
 
 import SuspectSourcesPage from './+page.svelte';
 import { createSuspectSourcesQuery } from '#lib/api/admin.js';
-import { suspectSourcesNextOffset } from '#lib/api/admin.js';
 
 const mocked = createSuspectSourcesQuery as ReturnType<typeof vi.fn>;
 
@@ -112,14 +111,3 @@ describe('Suspect sources page', () => {
     expect(screen.queryByRole('button', { name: /more/i })).not.toBeInTheDocument();
   });
 });
-
-describe('suspectSourcesNextOffset', () => {
-  test('counts tracks, not groups, and stops at the total', () => {
-    const groups = [
-      { directory: 'a', tracks: [track('1', '1.mp3', []), track('2', '2.mp3', [])] },
-      { directory: 'b', tracks: [track('3', '3.mp3', [])] }
-    ];
-    expect(suspectSourcesNextOffset(page(0, 10, groups))).toBe(3);
-    expect(suspectSourcesNextOffset(page(7, 10, groups))).toBeUndefined();
-  });
-});