How to mock a byte array by using EasyMock and PowerMock

Question

I tyied just like this:

byte[] mockByteArray = PowerMock.createMockAndExpectNew(byte[].class, 10);

But I got runtime exception: An object method could not be found! How to fix it?

[Edit] I want to mock a RandomAccessFile.read(byte[] buffer):

byte[] fileCutter(RandomAccessFile randomAccessFile, long position, int filePartSize) throws IOException{ 
     byte[] buffer = new byte[filePartSize];
     randomAccessFile.seek(position); 
     randomAccessFile.read(buffer);
     return buffer;
}

Solution

If you want to test the fileCutter method, you don't need to mock a byte array. You have to mock RandomAccessFile. For instance, like this (sorry for small syntax errors, I can't check now):

RandomAccessFile raf = EasyMock.createMock(RandomAccessFile.class);
// replace the byte array by what you expect
byte[] expectedRead = new byte[] { (byte) 129, (byte) 130, (byte) 131};
EasyMock.expect(raf.seek(EasyMock.anyInt()).once();
EasyMock.expect(raf.read(expectedRead)).once();

// If you don't care about the content of the byte array, you can do:
// EasyMock.expect(raf.read((byte[]) EasyMock.anyObject())).once();

myObjToTest.fileCutter(raf, ..., ...);