test: fix old tty tests

test-tty-wrap hasn’t worked since StreamBase was introduced, I think.
test-tty-stdout-end also happens to works with PipeWrap-s.

Refs: #7360
PR-URL: #7613
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/pseudo-tty/test-tty-stdout-end.js

@@ -1,5 +1,4 @@
 'use strict';
-// Can't test this when 'make test' doesn't assign a tty to the stdout.
 require('../common');
 const assert = require('assert');
 

test/pseudo-tty/test-tty-wrap.js

@@ -1,28 +1,11 @@
 'use strict';
-const common = require('../common');
-var assert = require('assert');
+require('../common');
 
-var TTY = process.binding('tty_wrap').TTY;
-var isTTY = process.binding('tty_wrap').isTTY;
+const TTY = process.binding('tty_wrap').TTY;
+const WriteWrap = process.binding('stream_wrap').WriteWrap;
 
-if (isTTY(1) == false) {
-  common.skip('fd 1 is not a tty.');
-  return;
-}
+const handle = new TTY(1);
+const req = new WriteWrap();
 
-var handle = new TTY(1);
-var callbacks = 0;
-
-var req1 = handle.writeBuffer(Buffer('hello world\n'));
-req1.oncomplete = function() {
-  callbacks++;
-};
-
-var req2 = handle.writeBuffer(Buffer('hello world\n'));
-req2.oncomplete = function() {
-  callbacks++;
-};
-
-process.on('exit', function() {
-  assert.equal(2, callbacks);
-});
+handle.writeBuffer(req, Buffer.from('hello world 1\n'));
+handle.writeBuffer(req, Buffer.from('hello world 2\n'));

test/pseudo-tty/test-tty-wrap.out

@@ -0,0 +1,2 @@
+hello world 1
+hello world 2