fix: resolve symlinks for test context's path

On macOS, `os.tmpdir()` returns a path that contains a symbolic link.
This can cause issues with modules that expect the environment to only
contain real paths. For example, the `resolve` module uses the HOME env
variable, which is derived from the context's path.

lib/temp-directory.js

@@ -1,15 +1,15 @@
 import { join } from 'path';
-import { promises as fs } from 'fs';
+import { promises as fs, realpathSync } from 'fs';
 import { randomUUID } from 'crypto';
 import { tmpdir } from 'os';
 
 import { removeDirectory } from './utils.js';
 
 export async function create(context) {
   if (context.options && context.options.tmpDir) {
-    context.path = join(context.options.tmpDir, randomUUID());
+    context.path = join(realpathSync(context.options.tmpDir), randomUUID());
   } else {
-    context.path = join(tmpdir(), randomUUID());
+    context.path = join(realpathSync(tmpdir()), randomUUID());
   }
   context.emit(
     'data',