diff --git a/test/canvas.test.js b/test/canvas.test.js
index c379111..d6fbc9d 100644
--- a/test/canvas.test.js
+++ b/test/canvas.test.js
@@ -752,8 +752,9 @@ module.exports = {
       , ctx = canvas.getContext('2d');
     
     ctx.font = 'normal 40px Impact';
-    var te = ctx.measureText('Wahoo');
-    assert.eql({ width: 111, height: 32 }, te);
+    assert.eql({ width: 111, height: 32 }, ctx.measureText('Wahoo'));
+    assert.eql(ctx.measureText(123), ctx.measureText('123'));
+    assert.eql(ctx.measureText(), ctx.measureText('undefined'));
   },
   
   'test Canvas#toBuffer()': function(assert){