fixup! test: add a more isolated Module._stat test

Signed-off-by: Darshan Sen <raisinten@gmail.com>

test/parallel/test-module-stat.js

@@ -0,0 +1,25 @@
+'use strict';
+require('../common');
+
+// This tests Module._stat.
+
+const Module = require('module');
+const fs = require('fs');
+const tmpdir = require('../common/tmpdir');
+const { ok, strictEqual } = require('assert');
+const { join } = require('path');
+
+const directory = join(tmpdir.path, 'directory');
+const doesNotExist = join(tmpdir.path, 'does-not-exist');
+const file = join(tmpdir.path, 'file.js');
+
+tmpdir.refresh();
+fs.writeFileSync(file, "module.exports = { a: 'b' }");
+fs.mkdirSync(directory);
+
+strictEqual(Module._stat(directory), 1); // Returns 1 for directories.
+strictEqual(Module._stat(file), 0); // Returns 0 for files.
+ok(Module._stat(doesNotExist) < 0); // Returns a negative integer for any other kind of strings.
+
+// TODO(RaisinTen): Add tests that make sure that Module._stat() does not crash when called
+// with a non-string data type. It crashes currently.