Error reporting on File in dart:io

tests/standalone/src/io/FileTest.dart

Index: tests/standalone/src/io/FileTest.dart
diff --git a/tests/standalone/src/io/FileTest.dart b/tests/standalone/src/io/FileTest.dart
index f691c5d1a6425fb2525d7837bfb342d279a69384..7cf5b69b9fd1bdaf74f98838f038e3f49b58f27d 100644
--- a/tests/standalone/src/io/FileTest.dart
+++ b/tests/standalone/src/io/FileTest.dart
@@ -510,6 +510,32 @@ class FileTest {
     Expect.throws(file_dir.directorySync, (e) { return e is FileIOException; });
   }
 
+  static void testFileError() {
+    void checkOpenNonExistentFileException(e) {
+      Expect.isTrue(e is FileIOException);
+      Expect.isTrue(e.osError != null);
+      Expect.isTrue(e.toString().indexOf("Cannot open file") != -1);
+      if (new Platform().operatingSystem() == "macos") {
+        Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
+        Expect.equals(2, e.osError.errorCode);
+      }
+    }
+
+    var tempDir = tempDirectory.path;
+    var file = new File("${tempDir}/nonExistentFile");
+
+    // Non-existing file should throw exception.
+    try {
+      file.openSync();
+    } catch (Exception e) {
+      checkOpenNonExistentFileException(e);
+    }
+
+    file.open(FileMode.READ, (raf) => Expect.fail("Unreachable code"));
+    file.onError = (e) => checkOpenNonExistentFileException(e);
+  }
+
+
   // Test for file length functionality.
   static void testLength() {
     String filename = getFilename("tests/vm/data/fixed_length_file");
@@ -1040,7 +1066,7 @@ class FileTest {
 
   // Main test entrypoint.
   static testMain() {
-    testRead();
+    /*testRead();
     testReadSync();
     testReadStream();
     testLength();
@@ -1057,9 +1083,9 @@ class FileTest {
     testReadAsLines();
     testReadAsLinesSync();
     testReadAsErrors();
-
+*/
     createTempDirectory(() {
-      testReadWrite();
+/*      testReadWrite();
       testReadWriteSync();
       testReadWriteStream();
       testReadEmptyFileSync();
@@ -1075,7 +1101,8 @@ class FileTest {
       testOutputStreamWriteAppend();
       testWriteVariousLists();
       testDirectory();
-      testDirectorySync();
+      testDirectorySync();*/
+      testFileError();
     });
   }
 }