Command to print paths to dependencies.

sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart

Index: sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart
diff --git a/sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart b/sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..554edd70fe8055307f01459834f428505321b653
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 d.file.
+
+import '../../lib/src/exit_codes.dart' as exit_codes;
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+main() {
+  initConfig();
+  integration('with no lockfile, exits with error', () {
+    d.dir(appPath, [
+      d.appPubspec()
+    ]).create();
+
+    schedulePub(args: ["list-package-dirs", "--format=json"],
+        error: '''
+        "Package \\"myapp\\" has no lockfile. Please run \\"pub install\\" first."
+        ''',
+        exitCode: exit_codes.NO_INPUT);
+  });
+}