test: expand test coverage of fs.js

* test reading a file passing a not valid enconding Refs: https://coverage.nodejs.org/coverage-067be658f966dafe/root/internal/fs.js.html
nodejs · Jan 23, 2017 · f328546 · f328546
1 parent 49b0d9f
commit f328546
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/test/parallel/test-fs-read-file-assert-encoding.js b/test/parallel/test-fs-read-file-assert-encoding.js
@@ -0,0 +1,13 @@
+'use strict';
+require('../common');
+
+const assert = require('assert');
+const fs = require('fs');
+
+const encoding = 'foo-8';
+const filename = 'bar.txt';
+
+assert.throws(
+  fs.readFile.bind(fs, filename, { encoding }, () => {}),
+  new RegExp(`Error: Unknown encoding: ${encoding}$`)
+);