Split up some slow pub tests and mark some scheduled_test tests as slow.

utils/tests/pub/lish/force_cannot_be_combined_with_dry_run_test.dart

Index: utils/tests/pub/lish/force_cannot_be_combined_with_dry_run_test.dart
diff --git a/utils/tests/pub/lish/force_cannot_be_combined_with_dry_run_test.dart b/utils/tests/pub/lish/force_cannot_be_combined_with_dry_run_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..088f636a81b205bbb32d460a82983f24615283f3
--- /dev/null
+++ b/utils/tests/pub/lish/force_cannot_be_combined_with_dry_run_test.dart
@@ -0,0 +1,24 @@
+// 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.
+
+import 'dart:json' as json;
+
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:scheduled_test/scheduled_server.dart';
+
+import '../../../pub/exit_codes.dart' as exit_codes;
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+main() {
+  initConfig();
+  setUp(d.validPackage.create);
+
+  integration('--force cannot be combined with --dry-run', () {
+    schedulePub(args: ['lish', '--force', '--dry-run'],
+        error: "Cannot use both --force and --dry-run.",
+        exitCode: exit_codes.USAGE);
+  });
+}