<?php
// $Id$

/**
 *  @file
 *  This provides SimpleTests for the core file handling functionality.
 *  These include FileValidateTest and FileSaveTest.
 */

/**
 * Helper validator that returns the $errors parameter.
 */
function file_test_validator($file, $errors) {
  return $errors;
}

/**
 * Base class for file tests that adds some additional file specific
 * assertions and helper functions.
 */
class FileTestCase extends DrupalWebTestCase {
  /**
   * Helper function to test the permissions of a file.
   *
   * @param $filepath
   *   String file path.
   * @param $expected_mode
   *   Octal integer like 0664 or 0777.
   * @param $message
   *   Optional message.
   */
  function assertFilePermissions($filepath, $expected_mode, $message = NULL) {
    // Mask out all but the last three octets.
    $actual_mode = fileperms($filepath) & 511;
    if (is_null($message)) {
      if ($actual_mode == $expected_mode) {
        $message = t('File permissions set correctly.');
      }
      else {
        $message = t('Expected file permission to be %expected, actually were %actual.', array('%actual' => decoct($actual_mode), '%expected' => decoct($expected_mode)));
      }
    }
    $this->assertEqual($actual_mode, $expected_mode, $message);
  }

  /**
   * Create a directory and assert it exists.
   *
   * @param $path
   *   Optional string with a directory path. If none is provided, a random
   *   name in the site's files directory will be used.
   * @return
   *   The path to the directory.
   */
  function createDirectory($path = NULL) {
    // A directory to operate on.
    if (is_null($path)) {
      $path = file_directory_path() . '/' . $this->randomName();
    }
    $this->assertTrue(mkdir($path) && is_dir($path), t('Directory was created successfully.'));
    return $path;
  }

  /**
   * Create a file and save it to the files table and assert that it occurs
   * correctly.
   *
   * @param $filepath
   *   Optional string specifying the file path. If none is provided then a
   *   randomly named file will be created in the site's files directory.
   * @return
   *   File object.
   */
  function createFile($filepath = NULL) {
    if (is_null($filepath)) {
      $filepath = file_directory_path() . '/' . $this->randomName();
    }

    file_put_contents($filepath, '');
    $this->assertTrue(is_file($filepath), t('The test file exists on the disk.'));

    $file = new stdClass();
    $file->filepath = $filepath;
    $file->filename = basename($file->filepath);
    $file->filemime = 'text/plain';
    $file->uid = 1;
    $file->timestamp = REQUEST_TIME;
    $file->filesize = 0;
    $this->assertNotIdentical(drupal_write_record('files', $file), FALSE, t('The file was added to the database.'));

    return $file;
  }
}

/**
 *  This will run tests against the file validation functions (file_validate_*).
 */
class FileValidateTest extends DrupalWebTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File validation'),
      'description' => t('Tests the functions used to validate uploaded files.'),
      'group' => t('File'),
    );
  }

  /**
   * Implementation of setUp().
   */
  function setUp() {
    parent::setUp();

    $this->image = new stdClass();
    $this->image->filepath = 'misc/druplicon.png';
    $this->iamge->filename = basename($this->image->filepath);

    $this->non_image = new stdClass();
    $this->non_image->filepath = 'misc/jquery.js';
    $this->non_image->filename = basename($this->non_image->filepath);
  }

  /**
   * Test the file_validate() function.
   */
  function testFileValidate() {
    // Empty validators.
    $this->assertEqual(file_validate($this->image, array()), array(), t('Validating an empty array works succesfully.'));

    // Use the file_test.module's test validator to ensure that passing tests
    // return correctly.
    $passing = array('file_test_validator' => array(array()));
    $this->assertEqual(file_validate($this->image, $passing), array(), t('Validating passes.'));

    $failing = array('file_test_validator' => array(array('Failed', 'Badly')));
    $this->assertEqual(file_validate($this->image, $failing), array('Failed', 'Badly'), t('Validating returns errors.'));
  }

  /**
   * Test the file_validate_extensions() function.
   */
  function testFileValidateExtensions() {
    $file = new stdClass();
    $file->filename = 'asdf.txt';
    $errors = file_validate_extensions($file, 'asdf txt pork');
    $this->assertEqual(count($errors), 0, t('Valid extension accepted.'), 'File');

    $file->filename = 'asdf.txt';
    $errors = file_validate_extensions($file, 'exe png');
    $this->assertEqual(count($errors), 1, t('Invalid extension blocked.'), 'File');
  }

  /**
   *  This ensures a specific file is actually an image.
   */
  function testFileValidateIsImage() {
    $this->assertTrue(file_exists($this->image->filepath), t('The image being tested exists.'), 'File');
    $errors = file_validate_is_image($this->image);
    $this->assertEqual(count($errors), 0, t('No error reported for our image file.'), 'File');

    $this->assertTrue(file_exists($this->non_image->filepath), t('The non-image being tested exists.'), 'File');
    $errors = file_validate_is_image($this->non_image);
    $this->assertEqual(count($errors), 1, t('An error reported for our non-image file.'), 'File');
  }

  /**
   *  This ensures the resolution of a specific file is within bounds.
   *  The image will be resized if it's too large.
   */
  function testFileValidateImageResolution() {
    // Non-images.
    $errors = file_validate_image_resolution($this->non_image);
    $this->assertEqual(count($errors), 0, t("Shouldn't get any errors for a non-image file."), 'File');
    $errors = file_validate_image_resolution($this->non_image, '50x50', '100x100');
    $this->assertEqual(count($errors), 0, t("Don't check the resolution on non files."), 'File');

    // Minimum size.
    $errors = file_validate_image_resolution($this->image);
    $this->assertEqual(count($errors), 0, t('No errors for an image when there is no minimum or maximum resolution.'), 'File');
    $errors = file_validate_image_resolution($this->image, 0, '200x1');
    $this->assertEqual(count($errors), 1, t("Got an error for an image that wasn't wide enough."), 'File');
    $errors = file_validate_image_resolution($this->image, 0, '1x200');
    $this->assertEqual(count($errors), 1, t("Got an error for an image that wasn't tall enough."), 'File');
    $errors = file_validate_image_resolution($this->image, 0, '200x200');
    $this->assertEqual(count($errors), 1, t('Small images report an error.'), 'File');

    // Maximum size.
    if (image_get_toolkit()) {
      // Copy the image so that the original doesn't get resized.
      $temp_dir = file_directory_temp();
      copy(realpath('misc/druplicon.png'), realpath($temp_dir) . '/druplicon.png');
      $this->image->filepath = $temp_dir . '/druplicon.png';

      $errors = file_validate_image_resolution($this->image, '10x5');
      $this->assertEqual(count($errors), 0, t('No errors should be reported when an oversized image can be scaled down.'), 'File');

      $info = image_get_info($this->image->filepath);
      $this->assertTrue($info['width'] <= 10, t('Image scaled to correct width.'), 'File');
      $this->assertTrue($info['height'] <= 5, t('Image scaled to correct height.'), 'File');

      unlink(realpath($temp_dir . '/druplicon.png'));
    }
    else {
      // TODO: should check that the error is returned if no toolkit is available.
      $errors = file_validate_image_resolution($this->image, '5x10');
      $this->assertEqual(count($errors), 1, t("Oversize images that can't be scaled get an error."), 'File');
    }
  }

  /**
   *  This will ensure the filename length is valid.
   */
  function testFileValidateNameLength() {
    // Create a new file object.
    $file = new stdClass();

    // Add a filename with an allowed length and test it.
    $file->filename = str_repeat('x', 255);
    $this->assertEqual(strlen($file->filename), 255);
    $errors = file_validate_name_length($file);
    $this->assertEqual(count($errors), 0, t('No errors reported for 255 length filename.'), 'File');

    // Add a filename with a length too long and test it.
    $file->filename = str_repeat('x', 256);
    $errors = file_validate_name_length($file);
    $this->assertEqual(count($errors), 1, t('An error reported for 256 length filename.'), 'File');

    // Add a filename with an empty string and test it.
    $file->filename = '';
    $errors = file_validate_name_length($file);
    $this->assertEqual(count($errors), 1, t('An error reported for 0 length filename.'), 'File');
  }


  /**
   * Test file_validate_size().
   */
  function testFileValidateSize() {
    global $user;
    $original_user = $user;
    drupal_save_session(FALSE);

    // Run these test as uid = 1.
    $user = user_load(array('uid' => 1));

    $file = new stdClass();
    $file->filesize = 999999;
    $errors = file_validate_size($file, 1, 1);
    $this->assertEqual(count($errors), 0, t('No size limits enforced on uid=1.'), 'File');

    // Run these tests as a regular user.
    $user = $this->drupalCreateUser();

    // Create a file with a size of 1000 bytes, and quotas of only 1 byte.
    $file = new stdClass();
    $file->filesize = 1000;
    $errors = file_validate_size($file, 0, 0);
    $this->assertEqual(count($errors), 0, t('No limits means no errors.'), 'File');
    $errors = file_validate_size($file, 1, 0);
    $this->assertEqual(count($errors), 1, t('Error for the file being over the limit.'), 'File');
    $errors = file_validate_size($file, 0, 1);
    $this->assertEqual(count($errors), 1, t('Error for the user being over their limit.'), 'File');
    $errors = file_validate_size($file, 1, 1);
    $this->assertEqual(count($errors), 2, t('Errors for both the file and their limit.'), 'File');

    $user = $original_user;
    drupal_save_session(TRUE);
  }
}

/**
 *  Tests the file_save_data() function.
 */
class FileSaveDataTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File save'),
      'description' => t('Tests the file save data function.'),
      'group' => t('File'),
    );
  }

  /**
   * Test the file_save_data() function.
   */
  function testFileSaveData() {
    $contents = $this->randomName(8);

    // No filename.
    $filepath = file_save_data($contents);
    $this->assertTrue($filepath, t('Unnamed file saved correctly.'));
    $this->assertEqual(file_directory_path(), dirname($filepath), t("File was placed in Drupal's files directory."));
    $this->assertEqual($contents, file_get_contents(realpath($filepath)), t('Contents of the file are correct.'));

    // Provide a filename.
    $filepath = file_save_data($contents, 'asdf.txt', FILE_EXISTS_REPLACE);
    $this->assertTrue($filepath, t('Unnamed file saved correctly.'));
    $this->assertEqual(file_directory_path(), dirname($filepath), t("File was placed in Drupal's files directory."));
    $this->assertEqual('asdf.txt', basename($filepath), t('File was named correctly.'));
    $this->assertEqual($contents, file_get_contents(realpath($filepath)), t('Contents of the file are correct.'));
    $this->assertFilePermissions($filepath, 0664);
  }
}

/**
 * Test the file_save_upload() function.
 */
class FileSaveUploadTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File uploading'),
      'description' => t('Tests the file uploading functions.'),
      'group' => t('File'),
    );
  }

  /**
   * Implementation of setUp().
   */
  function setUp() {
    // Need to enable the test module for an upload target.
    parent::setUp('file_test');
  }

  /**
   * Test the file_save_upload() function.
   */
  function testFileSaveUpload() {
    $max_fid_before = db_result(db_query('SELECT MAX(fid) AS fid FROM {files}'));

    $upload_user = $this->drupalCreateUser(array('access content'));
    $this->drupalLogin($upload_user);

    $image = current($this->drupalGetTestFiles('image'));
    $this->assertTrue(is_file($image->filename), t("The file we're going to upload exists."));
    $edit = array('files[file_test_upload]' => realpath($image->filename));
    $this->drupalPost('file-test/upload', $edit, t('Submit'));
    $this->assertResponse(200, t('Received a 200 response for posted test file.'));

    $max_fid_after = db_result(db_query('SELECT MAX(fid) AS fid FROM {files}'));
    $this->assertTrue($max_fid_after > $max_fid_before, t('A new file was created.'));

    // FIXME: Replace with file_load() once the hook_file patch gets committed.
    $file = db_fetch_object(db_query('SELECT f.* FROM {files} f WHERE f.fid = %d', array($max_fid_after)));
    $this->assertTrue($file, t('Loaded the file.'));
  }
}

/**
 * Directory related tests.
 */
class FileDirectoryTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File paths and directories'),
      'description' => t('Tests operations dealing with directories.'),
      'group' => t('File'),
    );
  }

  /**
   * Test the file_directory_path() function.
   */
  function testFileCheckDirectory() {
    // A directory to operate on.
    $directory = file_directory_path() . '/' . $this->randomName();
    $this->assertFalse(is_dir($directory), t('Directory does not exist prior to testing.'));

    // Non-existent directory.
    $form_element = $this->randomName();
    $this->assertFalse(file_check_directory($directory, 0, $form_element), t('Error reported for non-existing directory.'), 'File');

    // Check that an error was set for the form element above.
    $errors = form_get_errors();
    $this->assertEqual($errors[$form_element], t('The directory %directory does not exist.', array('%directory' => $directory)), t('Properly generated an error for the passed form element.'), 'File');

    // Make a directory.
    $this->assertTrue(file_check_directory($directory, FILE_CREATE_DIRECTORY), t('No error reported when creating a new directory.'), 'File');

    // Make sure directory actually exists.
    $this->assertTrue(is_dir($directory), t('Directory actually exists.'), 'File');

    // Make directory read only.
    @chmod($directory, 0444);
    $form_element = $this->randomName();
    $this->assertFalse(file_check_directory($directory, 0, $form_element), t('Error reported for a non-writeable directory.'), 'File');

    // Check if form error was set.
    $errors = form_get_errors();
    $this->assertEqual($errors[$form_element], t('The directory %directory is not writable', array('%directory' => $directory)), t('Properly generated an error for the passed form element.'), 'File');

    // Test directory permission modification.
    $this->assertTrue(file_check_directory($directory, FILE_MODIFY_PERMISSIONS), t('No error reported when making directory writeable.'), 'File');

    // Verify directory actually is writeable.
    $this->assertTrue(is_writeable($directory), t('Directory is writeable.'), 'File');

    // Remove .htaccess file to then test that it gets re-created.
    @unlink(file_directory_path() .'/.htaccess');
    file_check_directory(file_directory_path());
    $this->assertTrue(is_file(file_directory_path() . '/.htaccess'), t('Successfully created the .htaccess file in the files directory.'), 'File');

    // Verify contents of .htaccess file.
    $file = file_get_contents(file_directory_path() .'/.htaccess');
    $this->assertEqual($file, "SetHandler Drupal_Security_Do_Not_Remove_See_SA_2006_006\nOptions None\nOptions +FollowSymLinks", t('The .htaccess file contains the proper content.'), 'File');
  }

  /**
   * Check file_directory_path() and file_directory_temp().
   */
  function testFileDirectoryPath() {
    // Directory path.
    $path = variable_get('file_directory_path', conf_path() . '/files');
    $this->assertEqual($path, file_directory_path(), t('Properly returns the stored file directory path.'), 'File');
  }

  /**
   * Check file_directory_path() and file_directory_temp().
   */
  function testFileDirectoryTemp() {
    // Temporary directory handling.
    variable_set('file_directory_temp', NULL);
    $temp = file_directory_temp();
    $this->assertTrue(!is_null($temp), t('Properly set and retrieved temp directory %directory.', array('%directory' => $temp)), 'File');
  }

  /**
   * This tests that a file is actually in the specified directory, to prevent
   * exploits.
   */
  function testFileCheckLocation() {
    $source = 'misc/xyz.txt';
    $directory = 'misc';
    $result = file_check_location($source, $directory);
    $this->assertTrue($result, t('Non-existent file validates when checked for location in existing directory.'), 'File');

    $source = 'fake/xyz.txt';
    $directory = 'fake';
    $result = file_check_location($source, $directory);
    $this->assertTrue($result, t('Non-existent file validates when checked for location in non-existing directory.'), 'File');

    $source = 'misc/../install.php';
    $directory = 'misc';
    $result = file_check_location($source, $directory);
    $this->assertFalse($result, t('Existing file fails validation when it exists outside the directory path, using a /../ exploit.'), 'File');

    $source = 'misc/druplicon.png';
    $directory = 'misc';
    $result = file_check_location($source, $directory);
    $this->assertTrue($result, t('Existing file passes validation when checked for location in directory path, and filepath contains a subfolder of the checked path.'), 'File');

    $result = file_check_location($source, $directory);
    $this->assertTrue($result, t('Existing file passes validation, returning the source when checked for location in directory.'), 'File');
  }


  /**
   * This will take a directory and path, and find a valid filepath that is not
   * taken by another file.
   */
  function testFileCreateNewFilepath() {
    // First we test against an imaginary file that does not exist in a
    // directory.
    $basename = 'xyz.txt';
    $directory = 'misc';
    $original = $directory .'/'. $basename;
    $path = file_create_filename($basename, $directory);
    $this->assertEqual($path, $original, t('New filepath %new equals %original.', array('%new' => $path, '%original' => $original)), 'File');

    // Then we test against a file that already exists within that directory.
    $basename = 'druplicon.png';
    $original = $directory .'/'. $basename;
    $expected = $directory .'/druplicon_0.png';
    $path = file_create_filename($basename, $directory);
    $this->assertEqual($path, $expected, t('Creating a new filepath from %original equals %new.', array('%new' => $path, '%original' => $original)), 'File');

    // @TODO: Finally we copy a file into a directory several times, to ensure a properly iterating filename suffix.
  }

  /**
   * This will test the filepath for a destination based on passed flags and
   * whether or not the file exists.
   *
   * If a file exists, file_destination($destination, $replace) will either
   * return:
   * - the existing filepath, if $replace is FILE_EXISTS_REPLACE
   * - a new filepath if FILE_EXISTS_RENAME
   * - an error (returning FALSE) if FILE_EXISTS_ERROR.
   * If the file doesn't currently exist, then it will simply return the
   * filepath.
   */
  function testFileDestination() {
    // First test for non-existent file.
    $destination = 'misc/xyz.txt';
    $path = file_destination($destination, FILE_EXISTS_REPLACE);
    $this->assertEqual($path, $destination, t('Non-existing filepath destination is correct with FILE_EXISTS_REPLACE.'), 'File');
    $path = file_destination($destination, FILE_EXISTS_RENAME);
    $this->assertEqual($path, $destination, t('Non-existing filepath destination is correct with FILE_EXISTS_RENAME.'), 'File');
    $path = file_destination($destination, FILE_EXISTS_ERROR);
    $this->assertEqual($path, $destination, t('Non-existing filepath destination is correct with FILE_EXISTS_ERROR.'), 'File');

    $destination = 'misc/druplicon.png';
    $path = file_destination($destination, FILE_EXISTS_REPLACE);
    $this->assertEqual($path, $destination, t('Existing filepath destination remains the same with FILE_EXISTS_REPLACE.'), 'File');
    $path = file_destination($destination, FILE_EXISTS_RENAME);
    $this->assertNotEqual($path, $destination, t('A new filepath destination is created when filepath destination already exists with FILE_EXISTS_RENAME.'), 'File');
    $path = file_destination($destination, FILE_EXISTS_ERROR);
    $this->assertEqual($path, FALSE, t('An error is returned when filepath destination already exists with FILE_EXISTS_ERROR.'), 'File');
  }
}


/**
 * Deletion related tests.
 */
class FileDeleteTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File delete'),
      'description' => t('Tests the file delete function.'),
      'group' => t('File'),
    );
  }

  /**
   * Delete a normal file.
   */
  function testNormal() {
    // Create a file for testing
    $file = $this->createFile();

    // Delete a regular file
    $this->assertTrue(file_delete($file->filepath), t('Deleted worked.'));
    $this->assertFalse(file_exists($file->filepath), t('Test file has actually been deleted.'));
  }

  /**
   * Try deleting a missing file.
   */
  function testMissing() {
    // Try to delete a non-existing file
    $this->assertTrue(file_delete(file_directory_path() . '/' . $this->randomName()), t('Returns true when deleting a non-existant file.'));
  }

  /**
   * Try deleting a directory.
   */
  function testDirectory() {
    // A directory to operate on.
    $this->dirname = $this->createDirectory();

    // Try to delete a directory
    $this->assertFalse(file_delete($this->dirname), t('Could not delete the delete directory.'));
    $this->assertTrue(file_exists($this->dirname), t('Directory has not been deleted.'));
  }
}


/**
 * Move related tests
 */
class FileMoveTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File moving'),
      'description' => t('Tests the file move function.'),
      'group' => t('File'),
    );
  }

  /**
   * Move a normal file.
   */
  function testNormal() {
    // Create a file for testing
    $file = $this->createFile();

    // Moving to a new name.
    $desired_filepath = file_directory_path() . '/' . $this->randomName();
    $new_filepath = file_move($file->filepath, $desired_filepath, FILE_EXISTS_ERROR);
    $this->assertTrue($new_filepath, t('Move was successful.'));
    $this->assertEqual($new_filepath, $desired_filepath, t('Returned expected filepath.'));
    $this->assertTrue(file_exists($new_filepath), t('File exists at the new location.'));
    $this->assertFalse(file_exists($file->filepath), t('No file remains at the old location.'));
    $this->assertFilePermissions($new_filepath, 0664);

    // Moving with rename.
    $desired_filepath = file_directory_path() . '/' . $this->randomName();
    $this->assertTrue(file_exists($new_filepath), t('File exists before moving.'));
    $this->assertTrue(file_put_contents($desired_filepath, ' '), t('Created a file so a rename will have to happen.'));
    $newer_filepath = file_move($new_filepath, $desired_filepath, FILE_EXISTS_RENAME);
    $this->assertTrue($newer_filepath, t('Move was successful.'));
    $this->assertNotEqual($newer_filepath, $desired_filepath, t('Returned expected filepath.'));
    $this->assertTrue(file_exists($newer_filepath), t('File exists at the new location.'));
    $this->assertFalse(file_exists($new_filepath), t('No file remains at the old location.'));
    $this->assertFilePermissions($newer_filepath, 0664);

    // TODO: test moving to a directory (rather than full directory/file path)
  }

  /**
   * Try to move a missing file.
   */
  function testMissing() {
    // Move non-existant file.
    $new_filepath = file_move($this->randomName(), $this->randomName());
    $this->assertFalse($new_filepath, t('Moving a missing file fails.'));
  }

  /**
   * Try to move a file onto itself.
   */
  function testOverwriteSelf() {
    // Create a file for testing.
    $file = $this->createFile();

    // Move the file onto itself without renaming shouldn't make changes.
    $new_filepath = file_move($file->filepath, $file->filepath, FILE_EXISTS_REPLACE);
    $this->assertFalse($new_filepath, t('Moving onto itself without renaming fails.'));
    $this->assertTrue(file_exists($file->filepath), t('File exists after moving onto itself.'));

    // Move the file onto itself with renaming will result in a new filename.
    $new_filepath = file_move($file->filepath, $file->filepath, FILE_EXISTS_RENAME);
    $this->assertTrue($new_filepath, t('Moving onto itself with renaming works.'));
    $this->assertFalse(file_exists($file->filepath), t('Original file has been removed.'));
    $this->assertTrue(file_exists($new_filepath), t('File exists after moving onto itself.'));
  }
}


/**
 * Copy related tests.
 */
class FileCopyTest extends FileTestCase {
  /**
   * Implementation of getInfo().
   */
  function getInfo() {
    return array(
      'name' => t('File copying'),
      'description' => t('Tests the file copy function.'),
      'group' => t('File'),
    );
  }

  /**
   * Copy a normal file.
   */
  function testNormal() {
    // Create a file for testing
    $this->file = $this->createFile();

    // Copying to a new name.
    $desired_filepath = file_directory_path() . '/' . $this->randomName();
    $new_filepath = file_copy($this->file->filepath, $desired_filepath, FILE_EXISTS_ERROR);
    $this->assertTrue($new_filepath, t('Copy was successful.'));
    $this->assertEqual($new_filepath, $desired_filepath, t('Returned expected filepath.'));
    $this->assertTrue(file_exists($this->file->filepath), t('Original file remains.'));
    $this->assertTrue(file_exists($new_filepath), t('New file exists.'));
    $this->assertFilePermissions($new_filepath, 0664);

    // Copying with rename.
    $desired_filepath = file_directory_path() . '/' . $this->randomName();
    $this->assertTrue(file_put_contents($desired_filepath, ' '), t('Created a file so a rename will have to happen.'));
    $newer_filepath = file_copy($new_filepath, $desired_filepath, FILE_EXISTS_RENAME);
    $this->assertTrue($newer_filepath, t('Copy was successful.'));
    $this->assertNotEqual($newer_filepath, $desired_filepath, t('Returned expected filepath.'));
    $this->assertTrue(file_exists($this->file->filepath), t('Original file remains.'));
    $this->assertTrue(file_exists($new_filepath), t('New file exists.'));
    $this->assertFilePermissions($new_filepath, 0664);

    // TODO: test copying to a directory (rather than full directory/file path)
  }

  /**
   * Copy a non-existant file.
   */
  function testNonExistant() {
    // Copy non-existant file
    $desired_filepath = $this->randomName();
    $this->assertFalse(file_exists($desired_filepath), t("Randomly named file doesn't exists."));
    $new_filepath = file_copy($desired_filepath, $this->randomName());
    $this->assertFalse($new_filepath, t('Copying a missing file fails.'));
  }

  /**
   * Copy a file onto itself.
   */
  function testOverwriteSelf() {
    // Create a file for testing
    $this->file = $this->createFile();

    // Copy the file onto itself with renaming works.
    $new_filepath = file_copy($this->file->filepath, $this->file->filepath, FILE_EXISTS_RENAME);
    $this->assertTrue($new_filepath, t('Copying onto itself with renaming works.'));
    $this->assertNotEqual($new_filepath, $this->file->filepath, t('Copied file has a new name.'));
    $this->assertTrue(file_exists($this->file->filepath), t('Original file exists after copying onto itself.'));
    $this->assertTrue(file_exists($new_filepath), t('Copied file exists after copying onto itself.'));

    // Copy the file onto itself without renaming fails.
    $new_filepath = file_copy($this->file->filepath, $this->file->filepath, FILE_EXISTS_ERROR);
    $this->assertFalse($new_filepath, t('Copying onto itself without renaming fails.'));
    $this->assertTrue(file_exists($this->file->filepath), t('File exists after copying onto itself.'));

    // Copy the file into same directory without renaming fails.
    $new_filepath = file_copy($this->file->filepath, dirname($this->file->filepath), FILE_EXISTS_ERROR);
    $this->assertFalse($new_filepath, t('Copying onto itself fails.'));
    $this->assertTrue(file_exists($this->file->filepath), t('File exists after copying onto itself.'));

    // Copy the file into same directory with renaming works.
    $new_filepath = file_copy($this->file->filepath, dirname($this->file->filepath), FILE_EXISTS_RENAME);
    $this->assertTrue($new_filepath, t('Copying into same directory works.'));
    $this->assertNotEqual($new_filepath, $this->file->filepath, t('Copied file has a new name.'));
    $this->assertTrue(file_exists($this->file->filepath), t('Original file exists after copying onto itself.'));
    $this->assertTrue(file_exists($new_filepath), t('Copied file exists after copying onto itself.'));
  }
}