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diff --git a/test/simple/test-fs-truncate.js b/test/simple/test-fs-truncate.js
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+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var path = require('path');
+var fs = require('fs');
+var tmp = common.tmpDir;
+var filename = path.resolve(tmp, 'truncate-file.txt');
+var data = new Buffer(1024 * 16);
+data.fill('x');
+
+var stat;
+
+// truncateSync
+fs.writeFileSync(filename, data);
+stat = fs.statSync(filename);
+assert.equal(stat.size, 1024 * 16);
+
+fs.truncateSync(filename, 1024);
+stat = fs.statSync(filename);
+assert.equal(stat.size, 1024);
+
+fs.truncateSync(filename);
+stat = fs.statSync(filename);
+assert.equal(stat.size, 0);
+
+// ftruncateSync
+fs.writeFileSync(filename, data);
+var fd = fs.openSync(filename, 'r+');
+
+stat = fs.statSync(filename);
+assert.equal(stat.size, 1024 * 16);
+
+fs.ftruncateSync(fd, 1024);
+stat = fs.statSync(filename);
+assert.equal(stat.size, 1024);
+
+fs.ftruncateSync(fd);
+stat = fs.statSync(filename);
+assert.equal(stat.size, 0);
+
+fs.closeSync(fd);
+
+// async tests
+var success = 0;
+testTruncate(function(er) {
+  if (er) throw er;
+  success++;
+  testFtruncate(function(er) {
+    if (er) throw er;
+    success++;
+  });
+});
+
+process.on('exit', function() {
+  assert.equal(success, 2);
+  console.log('ok');
+});
+
+function testTruncate(cb) {
+  fs.writeFile(filename, data, function(er) {
+    if (er) return cb(er);
+    fs.stat(filename, function(er, stat) {
+      if (er) return cb(er);
+      assert.equal(stat.size, 1024 * 16);
+
+      fs.truncate(filename, 1024, function(er) {
+        if (er) return cb(er);
+        fs.stat(filename, function(er, stat) {
+          if (er) return cb(er);
+          assert.equal(stat.size, 1024);
+
+          fs.truncate(filename, function(er) {
+            if (er) return cb(er);
+            fs.stat(filename, function(er, stat) {
+              if (er) return cb(er);
+              assert.equal(stat.size, 0);
+              cb();
+            });
+          });
+        });
+      });
+    });
+  });
+}
+
+
+function testFtruncate(cb) {
+  fs.writeFile(filename, data, function(er) {
+    if (er) return cb(er);
+    fs.stat(filename, function(er, stat) {
+      if (er) return cb(er);
+      assert.equal(stat.size, 1024 * 16);
+
+      fs.open(filename, 'w', function(er, fd) {
+        if (er) return cb(er);
+        fs.ftruncate(fd, 1024, function(er) {
+          if (er) return cb(er);
+          fs.stat(filename, function(er, stat) {
+            if (er) return cb(er);
+            assert.equal(stat.size, 1024);
+
+            fs.ftruncate(fd, function(er) {
+              if (er) return cb(er);
+              fs.stat(filename, function(er, stat) {
+                if (er) return cb(er);
+                assert.equal(stat.size, 0);
+                fs.close(fd, cb);
+              });
+            });
+          });
+        });
+      });
+    });
+  });
+}