dart:io | Fix handling of exceptions from onBadCertificate callback.

tests/standalone/io/secure_bad_certificate_client.dart

+// Copyright (c) 2013, 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.
+
+// Client for secure_bad_certificate_test, that runs in a subprocess.
+// The test verifies that the client bad certificate callback works.
+
+import "dart:async";
+import "dart:io";
+
+class ExpectException implements Exception {
+  ExpectException(this.message);
+  String toString() => "ExpectException: $message";
+  String message;
+}
+
+void expect(condition) {
+  if (!condition) {
+    throw new ExpectException('');
+  }
+}
+
+const HOST_NAME = "localhost";
+
+void runClient(int port, result) {
+  bool badCertificateCallback(X509Certificate certificate) {
+    expect('CN=localhost' == certificate.subject);
+    expect('CN=myauthority' == certificate.issuer);
+    expect(result != 'exception');  // Throw exception if one is requested.
+    if (result == 'true') result = true;
+    if (result == 'false') result = false;
+    return result;
+  }
+
+  SecureSocket.connect(HOST_NAME,
+                       port,
+                       onBadCertificate: badCertificateCallback)
+      .then((SecureSocket socket) {
+        expect(result);
+        socket.close();
+      },
+      onError: (error) {
+        expect(result != true);
+        if (result == false) {
+          expect(error is HandshakeException);
+        } else if (result == 'exception') {
+          expect(error is ExpectException);
+        } else {
+          expect(error is ArgumentError);
+        }
+      });
+}
+
+
+void main() {
+  final args = new Options().arguments;
+  SecureSocket.initialize();
+  runClient(int.parse(args[0]), args[1]);
+}