RFR: 8275840: Testing FileChannel.transferTo(FileChannel) with more than 2 GB of data

[Brian Burkhalter]

On Sat, 23 Oct 2021 15:51:20 GMT, Markus KARG <duke at openjdk.java.net> wrote:

> Testing `FileChannel.transferTo(FileChannel)` with more than 2 GB of data is covering the case that *multiple* iterations of `FileChannel.transferTo(FileChannel)` are actually performed by the test.
> 
> This change was requested Alan Bateman @AlanBateman.

test/jdk/java/nio/channels/Channels/TransferTo.java line 151:

> 149: 
> 150:         // comparing reported transferred bytes, must be 3 GB
> 151:         assertEquals(count, 3L * 1024 * 1024 * 1024);

Also it would be better to use constants. One option is

int NUM_WRITES = 3*1024;
int BYTES_PER_WRITE = 1024*1024;

in which case the second parameter of the first `assertEquals()` would be `(long)NUM_WRITES*BYTES_PER_WRITE`.

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PR: https://git.openjdk.java.net/jdk/pull/6093