Test that copying over an existing file fails when FILE_EXISTS_ERROR is specified.
function testExistingError() {
$contents = $this
->randomName(10);
$source = $this
->createFile();
$target = $this
->createFile(NULL, $contents);
$this
->assertDifferentFile($source, $target);
// Clone the object so we don't have to worry about the function changing
// our reference copy.
$result = file_copy(clone $source, $target->uri, FILE_EXISTS_ERROR);
// Check the return status and that the contents were not changed.
$this
->assertFalse($result, t('File copy failed.'));
$this
->assertEqual($contents, file_get_contents($target->uri), t('Contents of file were not altered.'));
// Check that the correct hooks were called.
$this
->assertFileHooksCalled(array());
$this
->assertFileUnchanged($source, file_load($source->fid, TRUE));
$this
->assertFileUnchanged($target, file_load($target->fid, TRUE));
}