Modified unittest to use new argument syntax.

tests/html/svg_1_test.dart

 #library('SVG1Test');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 // Test that SVG is present in dart:html API
 
 main() {
   useHtmlConfiguration();
 
+  var isSVGElement = predicate((x) => x is SVGElement, 'is a SVGElement');
+
   test('simpleRect', () {
       var div = new Element.tag('div');
       document.body.nodes.add(div);
       div.innerHTML = r'''
 <svg id='svg1' width='200' height='100'>
 <rect id='rect1' x='10' y='20' width='130' height='40' rx='5'fill='blue'></rect>
 </svg>
 
 ''';
 
     var e = document.query('#svg1');
-    Expect.isTrue(e != null);
+    expect(e, isNotNull);
 
     SVGRectElement r = document.query('#rect1');
-    Expect.equals(10, r.x.baseVal.value);
-    Expect.equals(20, r.y.baseVal.value);
-    Expect.equals(40, r.height.baseVal.value);
-    Expect.equals(130, r.width.baseVal.value);
-    Expect.equals(5, r.rx.baseVal.value);
+    expect(r.x.baseVal.value, 10);
+    expect(r.y.baseVal.value, 20);
+    expect(r.height.baseVal.value, 40);
+    expect(r.width.baseVal.value, 130);
+    expect(r.rx.baseVal.value, 5);
   });
 
   test('trailing newline', () {
     // Ensures that we handle SVG with trailing newlines.
     var logo = new SVGElement.svg("""
       <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
         <path/>
       </svg>
       """);
 
-  expect(logo is SVGElement, true);
+  expect(logo, isSVGElement);
 
   });
 }