Test file_save_data() when renaming around an existing file.
function testExistingRename() {
// Setup a file to overwrite.
$existing = $this
->createFile();
$contents = $this
->randomName(8);
$result = file_save_data($contents, $existing->uri, FILE_EXISTS_RENAME);
$this
->assertTrue($result, t("File saved successfully."));
$this
->assertEqual('public', file_uri_scheme($result->uri), t("File was placed in Drupal's files directory."));
$this
->assertEqual($result->filename, $existing->filename, t("Filename was set to the basename of the source, rather than that of the renamed file."));
$this
->assertEqual($contents, file_get_contents($result->uri), t("Contents of the file are correct."));
$this
->assertEqual($result->filemime, 'application/octet-stream', t("A MIME type was set."));
$this
->assertEqual($result->status, FILE_STATUS_PERMANENT, t("The file's status was set to permanent."));
// Check that the correct hooks were called.
$this
->assertFileHooksCalled(array(
'insert',
));
// Ensure that the existing file wasn't overwritten.
$this
->assertDifferentFile($existing, $result);
$this
->assertFileUnchanged($existing, file_load($existing->fid, TRUE));
// Verify that was returned is what's in the database.
$this
->assertFileUnchanged($result, file_load($result->fid, TRUE));
}