Make pub publish more user friendly:

utils/tests/pub/directory_tree_test.dart

Index: utils/tests/pub/directory_tree_test.dart
diff --git a/utils/tests/pub/directory_tree_test.dart b/utils/tests/pub/directory_tree_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e9f892b215f46b8ab4d1ee57f4b7d6b9f22436cd
--- /dev/null
+++ b/utils/tests/pub/directory_tree_test.dart
@@ -0,0 +1,114 @@
+// Copyright (c) 2012, 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.
+
+library lock_file_test;
+
+import '../../../pkg/unittest/lib/unittest.dart';
+import '../../pub/directory_tree.dart';
+
+main() {
+  test('no files', () {
+    expect(generateTree([]), equals(""));
+  });
+
+  test('up to ten files in one directory are shown', () {
+    var files = [
+      "a.dart",
+      "b.dart",
+      "c.dart",
+      "d.dart",
+      "e.dart",
+      "f.dart",
+      "g.dart",
+      "h.dart",
+      "i.dart",
+      "j.dart"
+    ];
+    expect(generateTree(files), equals("""
+|-- a.dart
+|-- b.dart
+|-- c.dart
+|-- d.dart
+|-- e.dart
+|-- f.dart
+|-- g.dart
+|-- h.dart
+|-- i.dart
+'-- j.dart
+"""));
+  });
+
+  test('files are elided if there are more than ten', () {
+    var files = [
+      "a.dart",
+      "b.dart",
+      "c.dart",
+      "d.dart",
+      "e.dart",
+      "f.dart",
+      "g.dart",
+      "h.dart",
+      "i.dart",
+      "j.dart",
+      "k.dart"
+    ];
+    expect(generateTree(files), equals("""
+|-- a.dart
+|-- b.dart
+|-- c.dart
+|   (5 more...)
+|-- i.dart
+|-- j.dart
+'-- k.dart
+"""));
+  });
+
+  test('a complex example', () {
+    var files = [
+      "TODO",
+      "example/console_example.dart",
+      "example/main.dart",
+      "example/web copy/web_example.dart",
+      "test/absolute_test.dart",
+      "test/basename_test.dart",
+      "test/dirname_test.dart",
+      "test/extension_test.dart",
+      "test/is_absolute_test.dart",
+      "test/is_relative_test.dart",
+      "test/join_test.dart",
+      "test/normalize_test.dart",
+      "test/relative_test.dart",
+      "test/split_test.dart",
+      ".gitignore",
+      "README.md",
+      "lib/path.dart",
+      "pubspec.yaml",
+      "test/all_test.dart",
+      "test/path_posix_test.dart",
+      "test/path_windows_test.dart"
+    ];
+
+    expect(generateTree(files), equals("""
+|-- .gitignore
+|-- README.md
+|-- TODO
+|-- example
+|   |-- console_example.dart
+|   |-- main.dart
+|   '-- web copy
+|       '-- web_example.dart
+|-- lib
+|   '-- path.dart
+|-- pubspec.yaml
+'-- test
+    |-- absolute_test.dart
+    |-- all_test.dart
+    |-- basename_test.dart
+    |   (7 more...)
+    |-- path_windows_test.dart
+    |-- relative_test.dart
+    '-- split_test.dart
+"""));
+  });
+}