Add some basic tests

Author: elliotsayes

test/node/index.js

@@ -18,7 +18,8 @@ series([
   test(require.resolve('./log')),
   test(require.resolve('./promisify')),
   test(require.resolve('./callbackify')),
-  test(require.resolve('./types'))
+  test(require.resolve('./types')),
+  test(require.resolve('./text-encoding'))
 ], function (err) {
   if (err) throw err
 });

test/node/text-encoding.js

@@ -0,0 +1,12 @@
+var assert = require('assert');
+var util = require('../../');
+
+// TextEncoder
+assert.deepEqual((new util.TextEncoder('utf-8', {'fatal': true}))
+    .encode('hi'), new Uint8Array([0x68, 0x69]));
+
+// TextDecoder
+assert.deepEqual((new util.TextDecoder('utf-8', {'fatal': true}))
+    .decode(new Uint8Array([0x68, 0x69])), 'hi');
+assert.throws(() => {(new util.TextDecoder('utf-8', {'fatal': true}))
+    .decode(new Uint8Array([0xff]));})