Handle reading byte past the end of file

tests/standalone/src/FileTest.dart

 // Copyright (c) 2011, 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.
 //
 // Dart test program for testing file I/O.
 
 
 class FileTest {
   static Directory tempDirectory;
   static int numLiveAsyncTests = 0;
@@ skipping 247 matching lines @@
     Expect.equals(buffer1.length, buffer2.length);
     for (int i = 0; i < buffer1.length; i++) {
       Expect.equals(buffer1[i],  buffer2[i]);
     }
     // Delete the output file.
     outFile.deleteSync();
     Expect.isFalse(outFile.existsSync());
     return 1;
   }
 
+  static int testReadEmptyFileSync() {
+    String fileName = tempDirectory.path + "/empty_file_sync";
+    File file = new File(fileName);
+    file.createSync();
+    RandomAccessFile openedFile = file.openSync();
+    Expect.throws(() => openedFile.readByteSync(), (e) => e is FileIOException);
+    return 1;
+  }
+
+  static int testReadEmptyFile() {
+    String fileName = tempDirectory.path + "/empty_file";
+    File file = new File(fileName);
+    file.createHandler = () {
+      file.openHandler = (RandomAccessFile openedFile) {
+        openedFile.readByteHandler = (int byte) {
+          Expect.fail("Read byte from empty file");
+        };
+        openedFile.errorHandler = (String err) {
+          Expect.isTrue(err.indexOf("failed") != -1);
+        };
+        openedFile.readByte();
+      };
+      file.open();
+    };
+    asyncTestStarted();
+    file.create();
+    return 1;
+  }
+
   // Test for file length functionality.
   static int testLength() {
     String filename = getFilename("tests/vm/data/fixed_length_file");
     RandomAccessFile input = (new File(filename)).openSync();
     input.errorHandler = (s) {
       Expect.fail("No errors expected");
     };
     input.lengthHandler = (length) {
       Expect.equals(42, length);
       input.close();
@@ skipping 351 matching lines @@
     Expect.equals(1, testLength());
     Expect.equals(1, testLengthSync());
     Expect.equals(1, testPosition());
     Expect.equals(1, testPositionSync());
     Expect.equals(1, testMixedSyncAndAsync());
     asyncTestStarted();
     createTempDirectory(() {
         Expect.equals(1, testReadWrite());
         Expect.equals(1, testReadWriteSync());
         Expect.equals(1, testReadWriteStream());
+        Expect.equals(1, testReadEmptyFileSync());
+        Expect.equals(1, testReadEmptyFile());
         Expect.equals(1, testTruncate());
         Expect.equals(1, testTruncateSync());
         Expect.equals(1, testCloseException());
         Expect.equals(1, testCloseExceptionStream());
         Expect.equals(1, testBufferOutOfBoundsException());
         asyncTestDone();
       });
   }
 }
 
 main() {
   FileTest.testMain();
 }