Add publishTo to pubspec and use it in pub lish.

sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart

Index: sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
diff --git a/sdk/lib/_internal/pub/test/barback/fails_if_args_with_all_test.dart b/sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
similarity index 54%
copy from sdk/lib/_internal/pub/test/barback/fails_if_args_with_all_test.dart
copy to sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
index 42f79431d630a6b1ac02ab1945d9c6988860acef..cc538a7c1e933f13c74ad667f414735ec4ef52da 100644
--- a/sdk/lib/_internal/pub/test/barback/fails_if_args_with_all_test.dart
+++ b/sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
@@ -7,17 +7,16 @@ import 'package:scheduled_test/scheduled_test.dart';
 import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
-import 'utils.dart';
 
 main() {
   initConfig();
+  integration('preview shows an error if the package is private', () {
+    var pkg = packageMap("test_pkg", "1.0.0");
+    pkg["publishTo"] = "none";
+    d.dir(appPath, [d.pubspec(pkg)]).create();
 
-  setUp(() {
-    d.appDir().create();
+    schedulePub(args: ["lish", "--dry-run"],
+        error: startsWith("A private package cannot be published."),
+        exitCode: exit_codes.DATA);
   });
-
-  pubBuildAndServeShouldFail("if a directory is passed with --all",
-      args: ["example", "--all"],
-      error: 'Directory names are not allowed if "--all" is passed.',
-      exitCode: exit_codes.USAGE);
 }