Start cleaning up the HTML tests.

pkg/dev_compiler/test/codegen/lib/html/instance_of_test.dart

-library InstanceOfTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 
+import 'package:minitest/minitest.dart';
+
 main() {
   CanvasElement canvas;
 
   canvas = new Element.tag('canvas');
   canvas.attributes['width'] = '100';
   canvas.attributes['height'] = '100';
   document.body.append(canvas);
 
   var isCanvasRenderingContext = predicate((x) => x is CanvasRenderingContext,
       'is a CanvasRenderingContext');
+  var isNotCanvasRenderingContext = predicate((x) => x is! CanvasRenderingContext,
+      'is not a CanvasRenderingContext');
   var isCanvasRenderingContext2D =
       predicate((x) => x is CanvasRenderingContext2D,
       'is a CanvasRenderingContext2D');
+  var isNotCanvasRenderingContext2D =
+      predicate((x) => x is! CanvasRenderingContext2D,
+      'is not a CanvasRenderingContext2D');
   var isElement = predicate((x) => x is Element, 'is an Element');
+  var isNotElement = predicate((x) => x is! Element, 'is not an Element');
   var isCanvasElement =
       predicate((x) => x is CanvasElement, 'is a CanvasElement');
+  var isNotCanvasElement =
+      predicate((x) => x is! CanvasElement, 'is not a CanvasElement');
   var isImageData = predicate((x) => x is ImageData, 'is an ImageData');
+  var isNotImageData = predicate((x) => x is! ImageData, 'is not an ImageData');
   //var isUint8ClampedArray =
   //  predicate((x) => x is Uint8ClampedArray, 'is a Uint8ClampedArray');
   var isIntList =
       predicate((x) => x is List<int>, 'is a List<int>');
 
-  useHtmlConfiguration();
   test('Instanceof', () {
-    expect(canvas, isNot(isCanvasRenderingContext));
-    expect(canvas, isNot(isCanvasRenderingContext2D));
+    expect(canvas, isNotCanvasRenderingContext);
+    expect(canvas, isNotCanvasRenderingContext2D);
     expect(canvas, isElement);
     expect(canvas, isCanvasElement);
-    expect(canvas, isNot(isImageData));
+    expect(canvas, isNotImageData);
     // expect(canvas, isNot(isCanvasPixelArray));
 
     CanvasRenderingContext2D context = canvas.getContext('2d');
     expect(context, isCanvasRenderingContext);
     expect(context, isCanvasRenderingContext2D);
-    expect(context, isNot(isElement));
-    expect(context, isNot(isCanvasElement));
-    expect(context, isNot(isImageData));
+    expect(context, isNotElement);
+    expect(context, isNotCanvasElement);
+    expect(context, isNotImageData);
     // expect(context, isNot(isCanvasPixelArray));
 
     // FIXME(b/5286633): Interface injection type check workaround.
     var image = context.createImageData(canvas.width as dynamic,
                                         canvas.height as dynamic);
-    expect(image, isNot(isCanvasRenderingContext));
-    expect(image, isNot(isCanvasRenderingContext2D));
-    expect(image, isNot(isElement));
-    expect(image, isNot(isCanvasElement));
+    expect(image, isNotCanvasRenderingContext);
+    expect(image, isNotCanvasRenderingContext2D);
+    expect(image, isNotElement);
+    expect(image, isNotCanvasElement);
     expect(image, isImageData);
     // expect(image, isNot(isCanvasPixelArray));
 
     // Include CanvasPixelArray since constructor and prototype are not
     // available until one is created.
     var bytes = image.data;
-    expect(bytes, isNot(isCanvasRenderingContext));
-    expect(bytes, isNot(isCanvasRenderingContext2D));
-    expect(bytes, isNot(isElement));
-    expect(bytes, isNot(isCanvasElement));
-    expect(bytes, isNot(isImageData));
+    expect(bytes, isNotCanvasRenderingContext);
+    expect(bytes, isNotCanvasRenderingContext2D);
+    expect(bytes, isNotElement);
+    expect(bytes, isNotCanvasElement);
+    expect(bytes, isNotImageData);
     expect(bytes, isIntList);
 
     // FIXME: Ensure this is an SpanElement when we next update
     // WebKit IDL.
     var span = new Element.tag('span');
     expect(span, isElement);
   });
 }