Fix an analyzer warning in scheduled_test.

pkg/scheduled_test/lib/scheduled_test.dart

 // Copyright (c) 2013, 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.
 
 // TODO(nweiz): Add support for calling [schedule] while the schedule is already
 // running.
 // TODO(nweiz): Port the non-Pub-specific scheduled test libraries from Pub.
 /// A package for writing readable tests of asynchronous behavior.
 ///
 /// ## Installing ##
@@ skipping 204 matching lines @@
 /// The user-provided setUp function. This is set for each test during
 /// `unittest.setUp`.
 Function _setUpFn;
 
 /// Creates a new test case with the given description and body.
 ///
 /// This has the same semantics as [unittest.test].
 ///
 /// If [body] returns a [Future], that future will automatically be wrapped with
 /// [wrapFuture].
-void test(String description, Future body()) =>
+void test(String description, body()) =>
   _test(description, body, unittest.test);
 
 /// Creates a new test case with the given description and body that will be the
 /// only test run in this file.
 ///
 /// This has the same semantics as [unittest.solo_test].
 ///
 /// If [body] returns a [Future], that future will automatically be wrapped with
 /// [wrapFuture].
-void solo_test(String description, Future body()) =>
+void solo_test(String description, body()) =>
   _test(description, body, unittest.solo_test);
 
-void _test(String description, Future body(), Function testFn) {
+void _test(String description, body(), Function testFn) {
   maybeWrapFuture(future, description) {
     if (future != null) wrapFuture(future, description);
   }
 
   unittest.ensureInitialized();
   _ensureSetUpForTopLevel();
   testFn(description, () {
     var completer = new Completer();
 
     Chain.capture(() {
@@ skipping 53 matching lines @@
   currentSchedule.tasks.schedule(fn, description);
 
 /// Register a [setUp] function for a test [group]. This has the same semantics
 /// as [unittest.setUp]. Tasks may be scheduled using [schedule] within
 /// [setUpFn], and [currentSchedule] may be accessed as well.
 ///
 /// Note that there is no associated [tearDown] function. Instead, tasks should
 /// be scheduled for [currentSchedule.onComplete] or
 /// [currentSchedule.onException]. These tasks will be run after each test's
 /// schedule is completed.
-void setUp(void setUpFn()) {
+void setUp(setUpFn()) {
   _setUpScheduledTest(setUpFn);
 }
 
 /// Whether [unittest.setUp] has been called in the top level scope.
 bool _setUpForTopLevel = false;
 
 /// If we're in the top-level scope (that is, not in any [group]s) and
 /// [unittest.setUp] hasn't been called yet, call it.
 void _ensureSetUpForTopLevel() {
   if (_inGroup || _setUpForTopLevel) return;
@@ skipping 56 matching lines @@
 /// [description] provides an optional description of the future, which is
 /// used when generating error messages.
 Future wrapFuture(Future future, [String description]) {
   if (currentSchedule == null) {
     throw new StateError("Unexpected call to wrapFuture with no current "
         "schedule.");
   }
 
   return currentSchedule.wrapFuture(future, description);
 }