added test for display() calls with metadata

this test is currently failing

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

@@ -1,5 +1,5 b''
 //
-// Test svg isolation
+// Test display isolation
 // An object whose metadata contains an "isolated" tag must be isolated
 // from the rest of the document. In the case of inline SVGs, this means
 // that multiple SVGs have different scopes. This test checks that there
@@ -39,4 +39,30 b' casper.notebook_test(function () {'
         this.test.assertEquals(colors[0], '#ff0000', 'First svg should be red');
         this.test.assertEquals(colors[1], '#000000', 'Second svg should be black');
     });
+
+    // now ensure that we can pass the same metadata dict to plain old display()
+    this.thenEvaluate(function () {
+        var cell = IPython.notebook.get_cell(0);
+        cell.set_text( "from IPython.display import display\n"
+                     + "display(SVG(s1), metadata=dict(isolated=True))\n"
+                     + "display(SVG(s2), metadata=dict(isolated=True))\n"
+            );
+        cell.execute();
+    });
+   
+    // same test as original
+    this.then(function () {
+        var colors = this.evaluate(function () {
+            var colors = [];
+            var ifr = __utils__.findAll("iframe");
+            var svg1 = ifr[0].contentWindow.document.getElementById('r1');
+            colors[0] = window.getComputedStyle(svg1)["fill"];
+            var svg2 = ifr[1].contentWindow.document.getElementById('r2');
+            colors[1] = window.getComputedStyle(svg2)["fill"];
+            return colors;
+        });
+
+        this.test.assertEquals(colors[0], '#ff0000', 'First svg should be red');
+        this.test.assertEquals(colors[1], '#000000', 'Second svg should be black');
+    });
 });