test(paths): cover cross-platform asset resolution

tests/note-link-paths.test.mjs

@@ -0,0 +1,117 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import test from 'node:test';
+import { transformWithEsbuild } from 'vite';
+
+const source = await readFile(
+  new URL('../src/lib/utils/paths.ts', import.meta.url),
+  'utf8'
+);
+const { code } = await transformWithEsbuild(source, 'paths.ts', {
+  loader: 'ts',
+  format: 'esm',
+  target: 'esnext'
+});
+const {
+  assetSourceToMarkdown,
+  assetUrlToLocalPath,
+  normalizeLocalAssetPath,
+  resolvePathFromFile,
+  resolveVaultFilePath
+} = await import(
+  `data:text/javascript;base64,${Buffer.from(code).toString('base64')}`
+);
+
+test('resolves note links relative to Windows note paths', () => {
+  assert.equal(
+    resolvePathFromFile('C:\\Vault\\Current.md', './Target.md'),
+    'C:/Vault/Target.md'
+  );
+  assert.equal(
+    resolvePathFromFile('C:\\Vault\\Folder\\Current.md', '../Target.md'),
+    'C:/Vault/Target.md'
+  );
+  assert.equal(
+    resolvePathFromFile('\\\\server\\share\\Folder\\Current.md', '../Target.md'),
+    '//server/share/Target.md'
+  );
+});
+
+test('preserves Linux relative note-link resolution', () => {
+  assert.equal(
+    resolvePathFromFile('/vault/folder/Current.md', '../Target.md'),
+    '/vault/Target.md'
+  );
+});
+
+test('converts Windows asset URLs back to portable attachment paths', () => {
+  assert.equal(
+    normalizeLocalAssetPath('/C:\\Users\\user\\Vault\\image.png'),
+    'C:/Users/user/Vault/image.png'
+  );
+  assert.equal(
+    assetSourceToMarkdown(
+      'http://asset.localhost/C%3A%5CUsers%5Cuser%5CVault%5C.helixnotes%5Cattachments%5Cimage.png',
+      'C:\\Users\\user\\Vault\\Note.md',
+      'C:\\Users\\user\\Vault'
+    ),
+    '.helixnotes/attachments/image.png'
+  );
+});
+
+test('preserves portable asset paths on Linux and macOS', () => {
+  assert.equal(
+    assetSourceToMarkdown(
+      'asset://localhost/%2Fhome%2Fuser%2FVault%2F.helixnotes%2Fattachments%2Fimage.png',
+      '/home/user/Vault/Note.md',
+      '/home/user/Vault'
+    ),
+    '.helixnotes/attachments/image.png'
+  );
+  assert.equal(
+    assetSourceToMarkdown(
+      'asset://localhost/%2FUsers%2Fuser%2FVault%2Fassets%2Fimage.png',
+      '/Users/user/Vault/notes/Note.md',
+      '/Users/user/Vault'
+    ),
+    '../assets/image.png'
+  );
+  assert.equal(
+    assetSourceToMarkdown('../assets/image.png', '/vault/notes/Note.md', '/vault'),
+    '../assets/image.png'
+  );
+});
+
+test('decodes local asset URLs without damaging platform roots', () => {
+  assert.equal(
+    assetUrlToLocalPath('http://asset.localhost/C%3A%5CUsers%5Cuser%5CVault%5Cimage.png'),
+    'C:/Users/user/Vault/image.png'
+  );
+  assert.equal(
+    assetUrlToLocalPath('asset://localhost/%2Fhome%2Fuser%2FVault%2Fimage.png'),
+    '/home/user/Vault/image.png'
+  );
+  assert.equal(
+    assetUrlToLocalPath('http://asset.localhost/%5C%5Cserver%5Cshare%5CVault%5Cimage.png'),
+    '//server/share/Vault/image.png'
+  );
+});
+
+test('resolves vault files consistently across platforms', () => {
+  assert.equal(
+    resolveVaultFilePath('../assets/image.png', 'C:\\Vault\\notes\\Note.md', 'C:\\Vault'),
+    'C:/Vault/assets/image.png'
+  );
+  assert.equal(
+    resolveVaultFilePath('.helixnotes/attachments/image.png', 'C:\\Vault\\notes\\Note.md', 'C:\\Vault'),
+    'C:/Vault/.helixnotes/attachments/image.png'
+  );
+  assert.equal(
+    resolveVaultFilePath('../assets/image.png', '/vault/notes/Note.md', '/vault'),
+    '/vault/assets/image.png'
+  );
+  assert.equal(
+    resolveVaultFilePath('../assets/image.png', '\\\\server\\share\\Vault\\notes\\Note.md', '\\\\server\\share\\Vault'),
+    '//server/share/Vault/assets/image.png'
+  );
+});