fix: resolve symlinks for test context's path (#1079)

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

@@ -1,5 +1,5 @@
 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';
 
@@ -11,6 +11,10 @@ export async function create(context) {
   } else {
     context.path = join(tmpdir(), randomUUID());
   }
+
+  await fs.mkdir(context.path, { recursive: true });
+  context.path = realpathSync(context.path);
+
   context.emit(
     'data',
     'verbose',