Add test for aliases partial match

tests/rustdoc-js-std/alias-lev.js

@@ -0,0 +1,11 @@
+// This test ensures that aliases are also allowed to be partially matched.
+
+// ignore-order
+
+const EXPECTED = {
+    // The full alias name is `getcwd`.
+    'query': 'getcw',
+    'others': [
+        { 'path': 'std::env', 'name': 'current_dir', 'alias': 'getcwd' },
+    ],
+};