fs: add test for statfs validate path

Author: efekrskl

test/parallel/test-fs-promises-statfs-validate-path.js

@@ -0,0 +1,15 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+
+(async () => {
+  await assert.rejects(
+    fs.promises.statfs(),
+    (err) => {
+      assert.strictEqual(err.code, 'ERR_INVALID_ARG_TYPE');
+      return true;
+    }
+  );
+})().then(common.mustCall());