fixes #221, initial sync*, async, async* implementation

test/codegen/expect/unittest/unittest.js

+dart_library.library('unittest/unittest', null, /* Imports */[
+  "dart_runtime/dart",
+  'dom/dom',
+  'dart/core',
+  'dart/async'
+], /* Lazy imports */[
+], function(exports, dart, dom, core, async) {
+  'use strict';
+  let dartx = dart.dartx;
+  function group(name, body) {
+    return dart.dsend(dart.as(dom.window, dart.dynamic), 'suite', name, body);
+  }
+  dart.fn(group, dart.void, [core.String, dart.functionType(dart.void, [])]);
+  function test(name, body, opts) {
+    let skip = opts && 'skip' in opts ? opts.skip : null;
+    if (skip != null) {
+      core.print(`SKIP ${name}: ${skip}`);
+      return;
+    }
+    dart.dsend(dart.as(dom.window, dart.dynamic), 'test', name, dart.fn(done => {
+      function _finishTest(f) {
+        if (dart.is(f, async.Future)) {
+          dart.dsend(f, 'then', _finishTest);
+        } else {
+          dart.dcall(done);
+        }
+      }
+      dart.fn(_finishTest);
+      _finishTest(body());
+    }));
+  }
+  dart.fn(test, dart.void, [core.String, dart.functionType(dart.dynamic, [])], {skip: core.String});
+  function expect(actual, matcher) {
+    if (!dart.is(matcher, Matcher))
+      matcher = equals(matcher);
+    if (!dart.notNull(dart.as(dart.dcall(matcher, actual), core.bool))) {
+      dart.throw(`Expect failed to match ${actual} with ${matcher}`);
+    }
+  }
+  dart.fn(expect, dart.void, [core.Object, dart.dynamic]);
+  function fail(message) {
+    dart.throw('TestFailure: ' + dart.notNull(message));
+  }
+  dart.fn(fail, dart.void, [core.String]);
+  function equals(expected) {
+    return dart.fn(actual => {
+      if (dart.is(expected, core.List) && dart.is(actual, core.List)) {
+        let len = expected[dartx.length];
+        if (!dart.equals(len, dart.dload(actual, 'length')))
+          return false;
+        for (let i = 0; dart.notNull(i) < dart.notNull(len); i = dart.notNull(i) + 1) {
+          if (!dart.notNull(dart.as(dart.dcall(equals(expected[dartx.get](i)), dart.dindex(actual, i)), core.bool)))
+            return false;
+        }
+        return true;
+      } else {
+        return dart.equals(expected, actual);
+      }
+    });
+  }
+  dart.fn(equals, () => dart.definiteFunctionType(Matcher, [core.Object]));
+  function same(expected) {
+    return dart.fn(actual => core.identical(expected, actual), core.bool, [dart.dynamic]);
+  }
+  dart.fn(same, () => dart.definiteFunctionType(Matcher, [core.Object]));
+  function isNot(matcher) {
+    if (!dart.is(matcher, Matcher))
+      matcher = equals(matcher);
+    return dart.fn(actual => !dart.notNull(dart.as(dart.dcall(matcher, actual), core.bool)), core.bool, [dart.dynamic]);
+  }
+  dart.fn(isNot, () => dart.definiteFunctionType(Matcher, [dart.dynamic]));
+  function isTrue(actual) {
+    return dart.equals(actual, true);
+  }
+  dart.fn(isTrue, core.bool, [dart.dynamic]);
+  function isNull(actual) {
+    return actual == null;
+  }
+  dart.fn(isNull, core.bool, [dart.dynamic]);
+  dart.defineLazyProperties(exports, {
+    get isNotNull() {
+      return isNot(isNull);
+    }
+  });
+  function isRangeError(actual) {
+    return dart.is(actual, core.RangeError);
+  }
+  dart.fn(isRangeError, core.bool, [dart.dynamic]);
+  function isNoSuchMethodError(actual) {
+    return dart.is(actual, core.NoSuchMethodError);
+  }
+  dart.fn(isNoSuchMethodError, core.bool, [dart.dynamic]);
+  function lessThan(expected) {
+    return dart.fn(actual => dart.dsend(actual, '<', expected));
+  }
+  dart.fn(lessThan, () => dart.definiteFunctionType(Matcher, [dart.dynamic]));
+  function greaterThan(expected) {
+    return dart.fn(actual => dart.dsend(actual, '>', expected));
+  }
+  dart.fn(greaterThan, () => dart.definiteFunctionType(Matcher, [dart.dynamic]));
+  function throwsA(matcher) {
+    if (!dart.is(matcher, Matcher))
+      matcher = equals(matcher);
+    return dart.fn(actual => {
+      try {
+        dart.dcall(actual);
+        return false;
+      } catch (e) {
+        return dart.dcall(matcher, e);
+      }
+
+    });
+  }
+  dart.fn(throwsA, () => dart.definiteFunctionType(Matcher, [dart.dynamic]));
+  dart.defineLazyProperties(exports, {
+    get throws() {
+      return throwsA(dart.fn(a => true, core.bool, [dart.dynamic]));
+    }
+  });
+  let Matcher = dart.typedef('Matcher', () => dart.functionType(dart.dynamic, [dart.dynamic]));
+  // Exports:
+  exports.group = group;
+  exports.test = test;
+  exports.expect = expect;
+  exports.fail = fail;
+  exports.equals = equals;
+  exports.same = same;
+  exports.isNot = isNot;
+  exports.isTrue = isTrue;
+  exports.isNull = isNull;
+  exports.isRangeError = isRangeError;
+  exports.isNoSuchMethodError = isNoSuchMethodError;
+  exports.lessThan = lessThan;
+  exports.greaterThan = greaterThan;
+  exports.throwsA = throwsA;
+  exports.Matcher = Matcher;
+});