feat: introduce NotReadableException

lib/src/core/exceptions.dart

@@ -4,6 +4,8 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
+export "exceptions/web_idl.dart";
+
 /// Base class for custom exceptions defined in `dart_wot`.
 base class DartWotException implements Exception {
   /// Constructor.

lib/src/core/exceptions/web_idl.dart

@@ -0,0 +1,20 @@
+// Copyright 2024 Contributors to the Eclipse Foundation. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+import "../exceptions.dart";
+
+/// Indicates that an I/O read operation failed.
+///
+/// Corresponds with the Web IDL exception type [NotReadableError].
+///
+/// [NotReadableError]: https://webidl.spec.whatwg.org/#notreadableerror
+final class NotReadableException extends DartWotException {
+  /// Instantiates a new [NotReadableException] with the given [message].
+  NotReadableException(super.message);
+
+  @override
+  String get exceptionType => "NotReadableException";
+}

test/core/exceptions_test.dart

@@ -29,6 +29,11 @@ void main() {
         DiscoveryException("test").toString(),
         "DiscoveryException: test",
       );
+
+      expect(
+        NotReadableException("test").toString(),
+        "NotReadableException: test",
+      );
     });
   });
 }