Fuzzing of dart:io Directory API.

tests/standalone/io/fuzz_support.dart

+// 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('fuzz_support');
+
+#import('dart:io');
+
+final typeMapping = const {
+  'null': null,
+  'int': 0,
+  'bigint': 18446744073709551617,
+  'String': 'a',
+  'FileMode': FileMode.READ,
+  'num': 0.50,
+  'List<int>': const [1, 2, 3],
+  'Map<String, int>': const { "a": 23 }
+};
+
+typePermutations(int argCount) {
+  var result = [];
+  if (argCount == 2) {
+    typeMapping.forEach((k, v) {
+      typeMapping.forEach((k2, v2) {
+        result.add([v, v2]);
+      });
+    });
+  } else {
+    Expect.isTrue(argCount == 3);
+    typeMapping.forEach((k, v) {
+      typeMapping.forEach((k2, v2) {
+        typeMapping.forEach((k3, v3) {
+          result.add([v, v2, v3]);
+        });
+      });
+    });
+  }
+  return result;
+}
+
+// Perform sync operation and ignore all exceptions.
+doItSync(Function f) {
+  try { f(); } catch (var e) {}
+}
+
+// Perform async operation and transform the future for the operation
+// into a future that never fails by treating errors as normal
+// completion.
+Future doItAsync(Function f) {
+  // Ignore value and errors.
+  var completer = new Completer();
+  var future = f();
+  future.handleException((e) {
+    completer.complete(true);
+    return true;
+  });
+  future.then((v) => completer.complete(true));
+  return completer.future;
+}