Move minitest.dart into the expect package.

pkg/dev_compiler/test/codegen/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.
-/// The latter is much better feature-wise, but is also quite complex and has
-/// many dependencies. For low-level language and core library tests, we don't
-/// want to have to pull in a large number of dependencies and be able to run
-/// them correctly in order to run a test, so we want to test them against
-/// something simpler.
-///
-/// When possible, we just use the tiny expect library. But to avoid rewriting
-/// all of the existing tests that use unittest, they can instead use this,
-/// which shims the unittest API with as little code as possible and calls into
-/// expect.
-///
-/// Eventually, it would be good to refactor those tests to use the expect
-/// package directly and remove this.
-
-import 'package:expect/expect.dart';
-
-typedef void _Action();
-typedef void _ExpectationFunction(Object actual);
-
-final List<_Group> _groups = [new _Group()];
-
-final Object isFalse = new _Expectation(Expect.isFalse);
-final Object isNotNull = new _Expectation(Expect.isNotNull);
-final Object isNull = new _Expectation(Expect.isNull);
-final Object isTrue = new _Expectation(Expect.isTrue);
-
-final Object returnsNormally = new _Expectation((actual) {
-  try {
-    (actual as _Action)();
-  } catch (error) {
-    Expect.fail("Expected function to return normally, but threw:\n$error");
-  }
-});
-
-final Object throws = new _Expectation((actual) {
-  Expect.throws(actual as _Action);
-});
-
-final Object throwsArgumentError = new _Expectation((actual) {
-  Expect.throws(actual as _Action, (error) => error is ArgumentError);
-});
-
-final Object throwsNoSuchMethodError = new _Expectation((actual) {
-  Expect.throws(actual as _Action, (error) => error is NoSuchMethodError);
-});
-
-final Object throwsRangeError = new _Expectation((actual) {
-  Expect.throws(actual as _Action, (error) => error is RangeError);
-});
-
-final Object throwsStateError = new _Expectation((actual) {
-  Expect.throws(actual as _Action, (error) => error is StateError);
-});
-
-final Object throwsUnsupportedError = new _Expectation((actual) {
-  Expect.throws(actual as _Action, (error) => error is UnsupportedError);
-});
-
-/// The test runner should call this once after running a test file.
-void finishTests() {
-  _groups.clear();
-  _groups.add(new _Group());
-}
-
-void group(String description, body()) {
-  // TODO(rnystrom): Do something useful with the description.
-  _groups.add(new _Group());
-
-  try {
-    body();
-  } finally {
-    _groups.removeLast();
-  }
-}
-
-void test(String description, body()) {
-  // TODO(rnystrom): Do something useful with the description.
-  for (var group in _groups) {
-    if (group.setUpFunction != null) group.setUpFunction();
-  }
-
-  try {
-    body();
-  } finally {
-    for (var i = _groups.length - 1; i >= 0; i--) {
-      var group = _groups[i];
-      if (group.tearDownFunction != null) group.tearDownFunction();
-    }
-  }
-}
-
-void setUp(body()) {
-  // Can't define multiple setUps at the same level.
-  assert(_groups.last.setUpFunction == null);
-  _groups.last.setUpFunction = body;
-}
-
-void tearDown(body()) {
-  // Can't define multiple tearDowns at the same level.
-  assert(_groups.last.tearDownFunction == null);
-  _groups.last.tearDownFunction = body;
-}
-
-void expect(Object actual, Object expected, {String reason}) {
-  // TODO(rnystrom): Do something useful with reason.
-  if (expected is! _Expectation) {
-    expected = equals(expected);
-  }
-
-  var expectation = expected as _Expectation;
-  expectation.function(actual);
-}
-
-void fail(String message) {
-  Expect.fail(message);
-}
-
-Object equals(Object value) => new _Expectation((actual) {
-      Expect.deepEquals(value, actual);
-    });
-
-Object notEquals(Object value) => new _Expectation((actual) {
-      Expect.notEquals(value, actual);
-    });
-
-Object unorderedEquals(Object value) => new _Expectation((actual) {
-      Expect.setEquals(value, actual);
-    });
-
-// TODO(bob): Do something useful with the description.
-Object predicate(bool fn(Object value), [String description]) =>
-    new _Expectation((actual) {
-      Expect.isTrue(fn(actual));
-    });
-
-Object inInclusiveRange(num min, num max) => new _Expectation((actual) {
-      var actualNum = actual as num;
-      if (actualNum < min || actualNum > max) {
-        fail("Expected $actualNum to be in the inclusive range [$min, $max].");
-      }
-    });
-
-Object greaterThan(num value) => new _Expectation((actual) {
-      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);
-    });
-
-/// 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);
-}