test: fix timing sensitivity in test-net-write-slow

test/simple/test-net-write-slow.js

@@ -23,21 +23,28 @@ var common = require('../common');
 var assert = require('assert');
 var net = require('net');
 
-var SIZE = 1E5;
+var SIZE = 2E5;
 var N = 10;
+var flushed = 0;
 var received = 0;
 var buf = new Buffer(SIZE);
 buf.fill(0x61); // 'a'
 
 var server = net.createServer(function(socket) {
   socket.setNoDelay();
-  socket.setTimeout(500);
+  socket.setTimeout(200);
   socket.on('timeout', function() {
-    assert.fail();
+    assert.fail('flushed: ' + flushed +
+                ', received: ' + received + '/' + SIZE * N);
   });
 
   for (var i = 0; i < N; ++i) {
-    socket.write(buf);
+    socket.write(buf, function() {
+      ++flushed;
+      if (flushed === N) {
+        socket.setTimeout(0);
+      }
+    });
   }
   socket.end();
 
@@ -48,7 +55,7 @@ var server = net.createServer(function(socket) {
     conn.pause();
     setTimeout(function() {
       conn.resume();
-    }, 50);
+    }, 20);
   });
   conn.on('end', function() {
     server.close();