Remove uses of unittest in the HTML tests where possible.

pkg/expect/lib/minitest.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// A minimal, dependency-free emulation layer for a subset of the
 /// unittest/test API used by the language and core library (especially HTML)
 /// tests.
 ///
 /// A number of our language and core library tests were written against the
 /// unittest package, which is now deprecated in favor of the new test package.
@@ skipping 143 matching lines @@
       var actualNum = actual as num;
       if (actualNum <= value) {
         fail("Expected $actualNum to be greater than $value.");
       }
     });
 
 Object same(Object value) => new _Expectation((actual) {
       Expect.identical(value, actual);
     });
 
+Object closeTo(num value, num tolerance) => new _Expectation((actual) {
+      Expect.approxEquals(value, actual, tolerance);
+    });
+
+/// Succeeds if the actual value is any of the given strings. Unlike matcher's
+/// [anyOf], this only works with strings and requires an explicit list.
+Object anyOf(List<String> expected) => new _Expectation((actual) {
+      for (var string in expected) {
+        if (actual == string) return;
+      }
+
+      fail("Expected $actual to be one of $expected.");
+    });
+
 /// One level of group() nesting to track an optional [setUp()] and [tearDown()]
 /// function for the group.
 ///
 /// There is also an implicit top level group.
 class _Group {
   _Action setUpFunction;
   _Action tearDownFunction;
 }
 
 /// A wrapper around an expectation function.
 ///
 /// This function is passed the actual value and should throw an
 /// [ExpectException] if the value doesn't match the expectation.
 class _Expectation {
   final _ExpectationFunction function;
 
   _Expectation(this.function);
 }