try assertType instead of NotEquals, null

IPython/html/tests/casperjs/test_cases/display_image.js

@@ -1,64 +1,64 b''
 //
 // Test display of images
 //
 // The effect of shape metadata is validated,
 // using Image(retina=True)
 //
 
 
 // 2x2 black square in b64 jpeg and png
 b64_image_data = {
     "image/png" : "b'iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAC0lEQVR4nGNgQAYAAA4AAamRc7EA\\nAAAASUVORK5CYII='",
     "image/jpeg" : "b'/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a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\\noA//2Q=='"
 }
 
 
 casper.notebook_test(function () {
     // this.printLog();
     this.test_img_shape = function(fmt, retina) {
         this.thenEvaluate(function (b64data, retina) {
             IPython.notebook.get_cell(0).clear_output();
             var cell = IPython.notebook.get_cell(0);
             cell.set_text([
                 "import base64",
                 "from IPython.display import display, Image",
                 "data = base64.decodestring(" + b64data + ")",
                 "retina = bool(" + retina + ")",
                 "display(Image(data, retina=retina))"
             ].join("\n"));
             cell.execute();
         }, {b64data : b64_image_data[fmt], retina : retina ? 1:0 });
         
         this.wait_for_output(0);
         
         this.then(function() {
             var img = this.evaluate(function() {
                 // get a summary of the image that was just displayed
                 var cell = IPython.notebook.get_cell(0);
                 var img = $(cell.output_area.element.find("img")[0]);
                 return {
                     src : img.attr("src"),
                     width : img.width(),
                     height : img.height(),
                     width_attr : img.attr("width"),
                     height_attr : img.attr("height")
                 };
             });
             var prefix = "Image('" + fmt + "', retina=" + retina + ") ";
-            this.test.assertNotEquals(img, null, prefix + "img was displayed");
+            this.test.assertType(img, "object", prefix + "img was displayed");
             this.test.assertEquals(img.src.split(',')[0], "data:" + fmt + ";base64",
                 prefix + "data-uri prefix"
             );
             var sz = retina ? 1 : 2;
             var sz_attr = retina ? "1" : undefined;
             this.test.assertEquals(img.height, sz, prefix + "measured height");
             this.test.assertEquals(img.width, sz, prefix + "measured width");
             this.test.assertEquals(img.height_attr, sz_attr, prefix + "height attr");
             this.test.assertEquals(img.width_attr, sz_attr, prefix + "width attr");
         });
     };
     this.test_img_shape("image/png", false);
     this.test_img_shape("image/png", true);
     this.test_img_shape("image/jpeg", false);
     this.test_img_shape("image/jpeg", true);
 });