add File#toJSON() tests and docs

Readme.md

@@ -182,6 +182,11 @@ here for compatibility with the [W3C File API Draft](http://dev.w3.org/2006/weba
 
 If hash calculation was set, you can read the hex digest out of this var.
 
+#### Formidable.File#toJSON()
+
+  This method returns a JSON-representation of the file, allowing you to
+  `JSON.stringify()` the file which is useful for logging and responding
+  to requests.
 
 ### Events
 

lib/file.js

@@ -38,13 +38,12 @@ File.prototype.toJSON = function() {
     path: this.path,
     name: this.name,
     type: this.type,
-    hash: this.hash,
     mtime: this.lastModifiedDate,
     length: this.length,
     filename: this.filename,
     mime: this.mime
-  }
-}
+  };
+};
 
 File.prototype.write = function(buffer, cb) {
   var self = this;

test/unit/test-file.js

@@ -0,0 +1,33 @@
+var common       = require('../common');
+var test         = require('utest');
+var assert       = common.assert;
+var File = common.require('file');
+
+var file;
+var now = new Date;
+test('IncomingForm', {
+  before: function() {
+    file = new File({
+      size: 1024,
+      path: '/tmp/cat.png',
+      name: 'cat.png',
+      type: 'image/png',
+      lastModifiedDate: now,
+      filename: 'cat.png',
+      mime: 'image/png'
+    })
+  },
+
+  '#toJSON()': function() {
+    var obj = file.toJSON();
+    var len = Object.keys(obj).length;
+    assert.equal(1024, obj.size);
+    assert.equal('/tmp/cat.png', obj.path);
+    assert.equal('cat.png', obj.name);
+    assert.equal('image/png', obj.type);
+    assert.equal('image/png', obj.mime);
+    assert.equal('cat.png', obj.filename);
+    assert.equal(now, obj.mtime);
+    assert.equal(len, 8);
+  }
+});