New expectation functions plus convert old tests to use these.

lib/unittest/expectation.dart

-// Copyright (c) 2011, 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.
-
-/** This file is sourced by unittest.dart. It defines [Expectation]. */
-
-/**
- * Wraps an value and provides methods that can be used to verify that the value
- * matches a given expectation.
- */
-class Expectation {
-  final _value;
-
-  Expectation(this._value);
-
-  /** Asserts that the value is equivalent to [expected]. */
-  void equals(expected) {
-    // Use the type-specialized versions when appropriate to give better
-    // error messages.
-    if (_value is String && expected is String) {
-      Expect.stringEquals(expected, _value);
-    } else if (_value is Map && expected is Map) {
-      Expect.mapEquals(expected, _value);
-    } else if (_value is Set && expected is Set) {
-      Expect.setEquals(expected, _value);
-    } else {
-      Expect.equals(expected, _value);
-    }
-  }
-
-  /**
-   * Asserts that the difference between [expected] and the value is within
-   * [tolerance]. If no tolerance is given, it is assumed to be the value 4
-   * significant digits smaller than the expected value.
-   */
-  void approxEquals(num expected,
-      [num tolerance = null, String reason = null]) {
-    Expect.approxEquals(expected, _value, tolerance: tolerance, reason: reason);
-  }
-
-  /**
-   * Asserts that two objects are same (using [:===:]).
-   */
-  void same(expected) {
-    Expect.identical(_value, expected);
-  }
-
-  /** Asserts that the value is [null]. */
-  void isNull() {
-    Expect.equals(null, _value);
-  }
-
-  /** Asserts that the value is not [null]. */
-  void isNotNull() {
-    Expect.notEquals(null, _value);
-  }
-
-  /** Asserts that the value is [true]. */
-  void isTrue() {
-    Expect.equals(true, _value);
-  }
-
-  /** Asserts that the value is [false]. */
-  void isFalse() {
-    Expect.equals(false, _value);
-  }
-
-  /** Asserts that the value has the same elements as [expected]. */
-  void equalsCollection(Collection expected) {
-    Expect.listEquals(expected, _value);
-  }
-
-  /**
-   * Checks that every element of [expected] is also in [actual], and that
-   * every element of [actual] is also in [expected].
-   */
-  void equalsSet(Iterable expected) {
-    Expect.setEquals(expected, _value);
-  }
-}