Roll Observatory packages and add a roll script

packages/args/test/command_test.dart

+// Copyright (c) 2014, 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 command_test;
+
+import 'package:args/command_runner.dart';
+import 'package:test/test.dart';
+import 'utils.dart';
+
+void main() {
+  var foo;
+  setUp(() {
+    foo = new FooCommand();
+
+    // Make sure [Command.runner] is set up.
+    new CommandRunner("test", "A test command runner.").addCommand(foo);
+  });
+
+  group(".invocation has a sane default", () {
+    test("without subcommands", () {
+      expect(foo.invocation, equals("test foo [arguments]"));
+    });
+
+    test("with subcommands", () {
+      foo.addSubcommand(new AsyncCommand());
+      expect(foo.invocation, equals("test foo <subcommand> [arguments]"));
+    });
+
+    test("for a subcommand", () {
+      var async = new AsyncCommand();
+      foo.addSubcommand(async);
+
+      expect(async.invocation, equals("test foo async [arguments]"));
+    });
+  });
+
+  group(".usage", () {
+    test("returns the usage string", () {
+      expect(foo.usage, equals("""
+Set a value.
+
+Usage: test foo [arguments]
+-h, --help    Print this usage information.
+
+Run "test help" to see global options."""));
+    });
+
+    test("contains custom options", () {
+      foo.argParser.addFlag("flag", help: "Do something.");
+
+      expect(foo.usage, equals("""
+Set a value.
+
+Usage: test foo [arguments]
+-h, --help         Print this usage information.
+    --[no-]flag    Do something.
+
+Run "test help" to see global options."""));
+    });
+
+    test("doesn't print hidden subcommands", () {
+      foo.addSubcommand(new AsyncCommand());
+      foo.addSubcommand(new HiddenCommand());
+
+      expect(foo.usage, equals("""
+Set a value.
+
+Usage: test foo <subcommand> [arguments]
+-h, --help    Print this usage information.
+
+Available subcommands:
+  async   Set a value asynchronously.
+
+Run "test help" to see global options."""));
+    });
+
+    test("doesn't print subcommand aliases", () {
+      foo.addSubcommand(new AliasedCommand());
+
+      expect(foo.usage, equals("""
+Set a value.
+
+Usage: test foo <subcommand> [arguments]
+-h, --help    Print this usage information.
+
+Available subcommands:
+  aliased   Set a value.
+
+Run "test help" to see global options."""));
+    });
+  });
+
+  test("usageException splits up the message and usage", () {
+    expect(() => foo.usageException("message"), throwsUsageError("message", """
+Usage: test foo [arguments]
+-h, --help    Print this usage information.
+
+Run "test help" to see global options."""));
+  });
+
+  test("considers a command hidden if all its subcommands are hidden", () {
+    foo.addSubcommand(new HiddenCommand());
+    expect(foo.hidden, isTrue);
+  });
+}