Forward signals to pub run processes.

sdk/lib/_internal/pub/test/run/forwards_signal_posix_test.dart

Index: sdk/lib/_internal/pub/test/run/forwards_signal_posix_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/forwards_signal_posix_test.dart b/sdk/lib/_internal/pub/test/run/forwards_signal_posix_test.dart
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index 0000000000000000000000000000000000000000..bcd690de9301432ce94e323d49558bb2c9db33a6
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+++ b/sdk/lib/_internal/pub/test/run/forwards_signal_posix_test.dart
@@ -0,0 +1,54 @@
+// Copyright (c) 2015, 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:io';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+const _catchableSignals = const [
+  ProcessSignal.SIGHUP,
+  ProcessSignal.SIGINT,
+  ProcessSignal.SIGTERM,
+  ProcessSignal.SIGUSR1,
+  ProcessSignal.SIGUSR2,
+  ProcessSignal.SIGWINCH,
+];
+
+const SCRIPT = """
+import 'dart:io';
+
+main() {
+  ProcessSignal.SIGHUP.watch().listen(print);
+  ProcessSignal.SIGINT.watch().listen(print);
+  ProcessSignal.SIGTERM.watch().listen(print);
+  ProcessSignal.SIGUSR1.watch().listen(print);
+  ProcessSignal.SIGUSR2.watch().listen(print);
+  ProcessSignal.SIGWINCH.watch().listen(print);
+
+  print("ready");
+}
+""";
+
+main() {
+  initConfig();
+  integration('forwards signals to the inner script', () {
+    d.dir(appPath, [
+      d.appPubspec(),
+      d.dir("bin", [
+        d.file("script.dart", SCRIPT)
+      ])
+    ]).create();
+
+    var pub = pubRun(args: ["script"]);
+
+    pub.stdout.expect("ready");
+    for (var signal in _catchableSignals) {
+      pub.signal(signal);
+      pub.stdout.expect(signal.toString());
+    }
+
+    pub.kill();
+  });
+}