<?php

/**

* Tests the `WP_Upgrader` class.

*

* @group admin

* @group upgrade

*/

class Tests_Admin_WpUpgrader extends WP_UnitTestCase {

/**

* An instance of the WP_Upgrader class being tested.

*

* @var WP_Upgrader

*/

private static $instance;

/**

* @var WP_Upgrader_Skin&PHPUnit\Framework\MockObject\MockObject

*/

private static $upgrader_skin_mock;

/**

* Filesystem mock.

*

* @var WP_Filesystem_Base&PHPUnit\Framework\MockObject\MockObject

*/

private static $wp_filesystem_mock;

/**

* A backup of the existing 'wp_filesystem' global.

*

* @var mixed|null

*/

private static $wp_filesystem_backup = null;

/**

* Loads the class to be tested.

*/

public static function set_up_before_class() {

parent::set_up_before_class();

require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';

require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';

}

/**

* Sets up the class instance and mocks needed for each test.

*/

public function set_up() {

parent::set_up();

self::$upgrader_skin_mock = $this->getMockBuilder( 'WP_Upgrader_Skin' )->getMock();

self::$instance = new WP_Upgrader( self::$upgrader_skin_mock );

self::$wp_filesystem_mock = $this->getMockBuilder( 'WP_Filesystem_Base' )->getMock();

if ( array_key_exists( 'wp_filesystem', $GLOBALS ) ) {

self::$wp_filesystem_backup = $GLOBALS['wp_filesystem'];

}

$GLOBALS['wp_filesystem'] = self::$wp_filesystem_mock;

}

/**

* Cleans up after each test.

*/

public function tear_down() {

if ( null !== self::$wp_filesystem_backup ) {

$GLOBALS['wp_filesystem'] = self::$wp_filesystem_backup;

} else {

unset( $GLOBALS['wp_filesystem'] );

}

parent::tear_down();

}

/**

* Tests that `WP_Upgrader::__construct()` creates a skin when one is not

* passed to the constructor.

*

* @ticket 54245

*

* @covers WP_Upgrader::__construct

*/

public function test_constructor_should_create_skin_when_one_is_not_provided() {

$instance = new WP_Upgrader();

$this->assertInstanceOf( WP_Upgrader_Skin::class, $instance->skin );

}

/**

* Tests that `WP_Upgrader::init()` calls `WP_Upgrader::set_upgrader()`.

*

* @ticket 54245

*

* @covers WP_Upgrader::init

*/

public function test_init_should_call_set_upgrader() {

self::$upgrader_skin_mock->expects( $this->once() )->method( 'set_upgrader' )->with( self::$instance );

self::$instance->init();

}

/**

* Tests that `WP_Upgrader::init()` initializes the `$strings` property.

*

* @ticket 54245

*

* @covers WP_Upgrader::init

* @covers WP_Upgrader::generic_strings

*

* @dataProvider data_init_should_initialize_strings

*

* @param string $key The key to check.

*/

public function test_init_should_initialize_strings( $key ) {

$this->assertEmpty( self::$instance->strings, '"$strings" has already been initialized' );

self::$instance->init();

$this->assertArrayHasKey( $key, self::$instance->strings, "The '$key' key was not created" );

}

/**

* Data provider.

*

* @return array[]

*/

public function data_init_should_initialize_strings() {

return self::text_array_to_dataprovider(

array(

'bad_request',

'fs_unavailable',

'fs_error',

'fs_no_root_dir',

'fs_no_content_dir',

'fs_no_plugins_dir',

'fs_no_themes_dir',

'fs_no_folder',

'no_package',

'download_failed',

'installing_package',

'no_files',

'folder_exists',

'mkdir_failed',

'incompatible_archive',

'files_not_writable',

'maintenance_start',

'maintenance_end',

'temp_backup_mkdir_failed',

'temp_backup_move_failed',

'temp_backup_restore_failed',

'temp_backup_delete_failed',

)

);

}

/**

* Tests that `WP_Upgrader::flatten_dirlist()` returns the expected file list.

*

* @ticket 54245

*

* @dataProvider data_should_flatten_dirlist

*

* @covers WP_Upgrader::flatten_dirlist

*

* @param array $expected The expected flattened dirlist.

* @param array $nested_files Array of files as returned by WP_Filesystem_Base::dirlist().

* @param string $path Optional. Relative path to prepend to child nodes. Default empty string.

*/

public function test_flatten_dirlist_should_flatten_the_provided_directory_list( $expected, $nested_files, $path = '' ) {

$flatten_dirlist = new ReflectionMethod( self::$instance, 'flatten_dirlist' );

$flatten_dirlist->setAccessible( true );

$actual = $flatten_dirlist->invoke( self::$instance, $nested_files, $path );

$flatten_dirlist->setAccessible( false );

$this->assertSameSetsWithIndex( $expected, $actual );

}

/**

* Data provider.

*

* @return array[]

*/

public function data_should_flatten_dirlist() {

return array(

'empty array, default path' => array(

'expected' => array(),

'nested_files' => array(),

),

'root only' => array(

'expected' => array(

'file1.php' => array( 'name' => 'file1.php' ),

'file2.php' => array( 'name' => 'file2.php' ),

),

'nested_files' => array(

'file1.php' => array( 'name' => 'file1.php' ),

'file2.php' => array( 'name' => 'file2.php' ),

),

),

'root only and custom path' => array(

'expected' => array(

'custom_path/file1.php' => array( 'name' => 'file1.php' ),

'custom_path/file2.php' => array( 'name' => 'file2.php' ),

),

'nested_files' => array(

'file1.php' => array( 'name' => 'file1.php' ),

'file2.php' => array( 'name' => 'file2.php' ),

),

'path' => 'custom_path/',

),

'one level deep' => array(

'expected' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

),

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

),

),

'subdir1/subfile1.php' => array( 'name' => 'subfile1.php' ),

'subdir1/subfile2.php' => array( 'name' => 'subfile2.php' ),

'subdir2/subfile3.php' => array( 'name' => 'subfile3.php' ),

'subdir2/subfile4.php' => array( 'name' => 'subfile4.php' ),

),

'nested_files' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

),

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

),

),

),

),

'one level deep and numeric keys' => array(

'expected' => array(

'subdir1' => array(

'files' => array(

0 => array( 'name' => '0' ),

1 => array( 'name' => '1' ),

),

),

'subdir2' => array(

'files' => array(

2 => array( 'name' => '2' ),

3 => array( 'name' => '3' ),

),

),

'subdir1/0' => array( 'name' => '0' ),

'subdir1/1' => array( 'name' => '1' ),

'subdir2/2' => array( 'name' => '2' ),

'subdir2/3' => array( 'name' => '3' ),

),

'nested_files' => array(

'subdir1' => array(

'files' => array(

'0' => array( 'name' => '0' ),

'1' => array( 'name' => '1' ),

),

),

'subdir2' => array(

'files' => array(

'2' => array( 'name' => '2' ),

'3' => array( 'name' => '3' ),

),

),

),

),

'one level deep and custom path' => array(

'expected' => array(

'custom_path/subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

),

),

'custom_path/subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

),

),

'custom_path/subdir1/subfile1.php' => array(

'name' => 'subfile1.php',

),

'custom_path/subdir1/subfile2.php' => array(

'name' => 'subfile2.php',

),

'custom_path/subdir2/subfile3.php' => array(

'name' => 'subfile3.php',

),

'custom_path/subdir2/subfile4.php' => array(

'name' => 'subfile4.php',

),

),

'nested_files' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

),

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

),

),

),

'path' => 'custom_path/',

),

'two levels deep' => array(

'expected' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array(

'name' => 'subfile1.php',

),

'subfile2.php' => array(

'name' => 'subfile2.php',

),

'subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

),

),

'subdir1/subfile1.php' => array(

'name' => 'subfile1.php',

),

'subdir1/subfile2.php' => array(

'name' => 'subfile2.php',

),

'subdir1/subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

'subdir1/subsubdir1/subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subdir1/subsubdir1/subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

'subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

),

),

'subdir2/subfile3.php' => array(

'name' => 'subfile3.php',

),

'subdir2/subfile4.php' => array(

'name' => 'subfile4.php',

),

'subdir2/subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

'subdir2/subsubdir2/subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subdir2/subsubdir2/subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

'nested_files' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

'subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

),

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

'subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

),

),

),

),

'two levels deep and custom path' => array(

'expected' => array(

'custom_path/subdir1' => array(

'files' => array(

'subfile1.php' => array(

'name' => 'subfile1.php',

),

'subfile2.php' => array(

'name' => 'subfile2.php',

),

'subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

),

),

'custom_path/subdir1/subfile1.php' => array(

'name' => 'subfile1.php',

),

'custom_path/subdir1/subfile2.php' => array(

'name' => 'subfile2.php',

),

'custom_path/subdir1/subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

'custom_path/subdir1/subsubdir1/subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'custom_path/subdir1/subsubdir1/subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

'custom_path/subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

'subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

),

),

'custom_path/subdir2/subfile3.php' => array(

'name' => 'subfile3.php',

),

'custom_path/subdir2/subfile4.php' => array(

'name' => 'subfile4.php',

),

'custom_path/subdir2/subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

'custom_path/subdir2/subsubdir2/subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'custom_path/subdir2/subsubdir2/subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

'nested_files' => array(

'subdir1' => array(

'files' => array(

'subfile1.php' => array( 'name' => 'subfile1.php' ),

'subfile2.php' => array( 'name' => 'subfile2.php' ),

'subsubdir1' => array(

'files' => array(

'subsubfile1.php' => array(

'name' => 'subsubfile1.php',

),

'subsubfile2.php' => array(

'name' => 'subsubfile2.php',

),

),

),

),

),

'subdir2' => array(

'files' => array(

'subfile3.php' => array( 'name' => 'subfile3.php' ),

'subfile4.php' => array( 'name' => 'subfile4.php' ),

'subsubdir2' => array(

'files' => array(

'subsubfile3.php' => array(

'name' => 'subsubfile3.php',

),

'subsubfile4.php' => array(

'name' => 'subsubfile4.php',

),

),

),

),

),

),

'path' => 'custom_path/',

),

);

}

/**

* Tests that `WP_Upgrader::clear_destination()` returns early with `true`

* when the destination does not exist.

*

* @ticket 54245

*

* @covers WP_Upgrader::clear_destination

*/

public function test_clear_destination_should_return_early_when_the_destination_does_not_exist() {

self::$wp_filesystem_mock->expects( $this->never() )->method( 'is_writable' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'chmod' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'delete' );

$destination = DIR_TESTDATA . '/upgrade/';

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( $destination )

->willReturn( false );

$this->assertTrue( self::$instance->clear_destination( $destination ) );

}

/**

* Tests that `WP_Upgrader::clear_destination()` clears

* the destination directory.

*

* @ticket 54245

*

* @covers WP_Upgrader::clear_destination

*/

public function test_clear_destination_should_clear_the_destination_directory() {

$destination = DIR_TESTDATA . '/upgrade/';

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( $destination )

->willReturn( array() );

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'delete' )

->with( $destination )

->willReturn( true );

$this->assertTrue( self::$instance->clear_destination( $destination ) );

}

/**

* Tests that `WP_Upgrader::clear_destination()` returns a WP_Error object

* if files are not writable.

*

* This test runs in a separate process so that it can define

* constants without impacting other tests.

*

* This test does not preserve global state to prevent the exception

* "Serialization of 'Closure' is not allowed." when running in a

* separate process.

*

* @ticket 54245

*

* @covers WP_Upgrader::clear_destination

*

* @runInSeparateProcess

* @preserveGlobalState disabled

*/

public function test_clear_destination_should_return_wp_error_if_files_are_not_writable() {

define( 'FS_CHMOD_FILE', 0644 );

define( 'FS_CHMOD_DIR', 0755 );

self::$instance->generic_strings();

self::$wp_filesystem_mock->expects( $this->never() )->method( 'delete' );

$destination = DIR_TESTDATA . '/upgrade/';

$dirlist = array(

'file1.php' => array(

'name' => 'file1.php',

'type' => 'f',

),

'subdir' => array(

'name' => 'subdir',

'type' => 'd',

),

);

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( $destination )

->willReturn( $dirlist );

$unwritable_checks = array(

array( $destination . 'file1.php' ),

array( $destination . 'file1.php' ),

array( $destination . 'subdir' ),

array( $destination . 'subdir' ),

);

self::$wp_filesystem_mock

->expects( $this->exactly( 4 ) )

->method( 'is_writable' )

->withConsecutive( ...$unwritable_checks )

->willReturn( false );

$actual = self::$instance->clear_destination( $destination );

$this->assertWPError(

$actual,

'WP_Upgrader::clear_destination() did not return a WP_Error object'

);

$this->assertSame(

'files_not_writable',

$actual->get_error_code(),

'Unexpected WP_Error code'

);

$this->assertSameSets(

array( 'file1.php, subdir' ),

$actual->get_all_error_data(),

'Unexpected WP_Error data'

);

}

/**

* Tests that `WP_Upgrader::install_package()` returns a WP_Error object

* when an invalid source is passed.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*

* @dataProvider data_install_package_invalid_paths

*

* @param mixed $path The path to test.

*/

public function test_install_package_should_return_wp_error_with_invalid_source( $path ) {

self::$instance->generic_strings();

self::$upgrader_skin_mock->expects( $this->never() )->method( 'feedback' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'dirlist' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'find_folder' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'is_dir' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'exists' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'delete' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'mkdir' );

$args = array(

'source' => $path,

'destination' => '/',

);

$actual = self::$instance->install_package( $args );

$this->assertWPError(

$actual,

'WP_Upgrader::install_package() did not return a WP_Error object'

);

$this->assertSame(

'bad_request',

$actual->get_error_code(),

'Unexpected WP_Error code'

);

}

/**

* Tests that `WP_Upgrader::install_package()` returns a WP_Error object

* when an invalid destination is passed.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*

* @dataProvider data_install_package_invalid_paths

*

* @param mixed $path The path to test.

*/

public function test_install_package_should_return_wp_error_with_invalid_destination( $path ) {

self::$instance->generic_strings();

self::$upgrader_skin_mock->expects( $this->never() )->method( 'feedback' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'dirlist' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'find_folder' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'is_dir' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'exists' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'delete' );

self::$wp_filesystem_mock->expects( $this->never() )->method( 'mkdir' );

$args = array(

'source' => '/',

'destination' => $path,

);

$actual = self::$instance->install_package( $args );

$this->assertWPError(

$actual,

'WP_Upgrader::install_package() did not return a WP_Error object'

);

$this->assertSame(

'bad_request',

$actual->get_error_code(),

'Unexpected WP_Error code'

);

}

/**

* Data provider.

*

* @return array[]

*/

public function data_install_package_invalid_paths() {

return array(

'empty string' => array( 'path' => '' ),

// Type checks.

'empty array' => array( 'path' => array() ),

'populated array' => array( 'path' => array( '/' ) ),

'(int) 0' => array( 'path' => 0 ),

'(int) -0' => array( 'path' => -0 ),

'(int) -1' => array( 'path' => -1 ),

'(int) 1' => array( 'path' => 1 ),

'(float) 0.0' => array( 'path' => 0.0 ),

'(float) -0.0' => array( 'path' => -0.0 ),

'(float) 1.0' => array( 'path' => 1.0 ),

'(float) -1.0' => array( 'path' => -1.0 ),

'(bool) false' => array( 'path' => false ),

'(bool) true' => array( 'path' => true ),

'null' => array( 'path' => null ),

'empty object' => array( 'path' => new stdClass() ),

'populated object' => array( 'path' => (object) array( '/' ) ),

// Ensures that `trim()` is run triggering an empty array.

'a string with spaces' => array( 'path' => ' ' ),

'a string with tabs' => array( 'path' => "\t\t" ),

'a string with new lines' => array( 'path' => "\n\n" ),

'a string with carriage returns' => array( 'path' => "\r\r" ),

// Ensure that strings with leading/trailing whitespace are invalid.

'a path with a leading space' => array( 'path' => ' /path' ),

'a path with a trailing space' => array( 'path' => '/path ' ),

'a path with a leading tab' => array( 'path' => "\t/path" ),

'a path with a trailing tab' => array( 'path' => "/path\t" ),

);

}

/**

* Tests that `WP_Upgrader::install_package()` returns a WP_Error object

* when the 'upgrader_pre_install' filter returns a WP_Error object.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*/

public function test_install_package_should_return_wp_error_when_pre_install_filter_returns_wp_error() {

self::$instance->generic_strings();

self::$upgrader_skin_mock

->expects( $this->once() )

->method( 'feedback' )

->with( 'installing_package' );

add_filter(

'upgrader_pre_install',

static function () {

return new WP_Error( 'from_upgrader_pre_install' );

}

);

$args = array(

'source' => '/',

'destination' => '/',

);

$actual = self::$instance->install_package( $args );

$this->assertWPError(

$actual,

'WP_Upgrader::install_package() did not return a WP_Error object'

);

$this->assertSame(

'from_upgrader_pre_install',

$actual->get_error_code(),

'The WP_Error object was not returned from the filter'

);

}

/**

* Tests that `WP_Upgrader::install_package()` adds a trailing slash to

* the source directory and a single subdirectory.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*/

public function test_install_package_should_add_trailing_slash_to_source_and_subdirectory() {

self::$instance->generic_strings();

self::$upgrader_skin_mock

->expects( $this->once() )

->method( 'feedback' )

->with( 'installing_package' );

$dirlist = array(

'subdir' => array(

'name' => 'subdir',

'type' => 'd',

'files' => array( 'subfile.php' ),

),

);

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( '/source_dir' )

->willReturn( $dirlist );

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'is_dir' )

->with( '/source_dir/subdir/' )

->willReturn( true );

add_filter(

'upgrader_source_selection',

function ( $source ) {

$this->assertSame( '/source_dir/subdir/', $source );

// Return a WP_Error to exit before `move_dir()/copy_dir()`.

return new WP_Error();

}

);

$args = array(

'source' => '/source_dir',

'destination' => '/dest_dir',

);

self::$instance->install_package( $args );

}

/**

* Tests that `WP_Upgrader::install_package()` returns a WP_Error object

* when no source files exist.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*/

public function test_install_package_should_return_wp_error_when_no_source_files_exist() {

self::$instance->generic_strings();

self::$upgrader_skin_mock

->expects( $this->once() )

->method( 'feedback' )

->with( 'installing_package' );

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( '/' )

->willReturn( array() );

$args = array(

'source' => '/',

'destination' => '/',

);

$actual = self::$instance->install_package( $args );

$this->assertWPError(

$actual,

'WP_Upgrader::install_package() did not return a WP_Error object'

);

$this->assertSame(

'incompatible_archive_empty',

$actual->get_error_code(),

'Unexpected WP_Error code'

);

}

/**

* Tests that `WP_Upgrader::install_package()` adds a trailing slash to

* the source directory of a single file.

*

* @ticket 54245

*

* @covers WP_Upgrader::install_package

*/

public function test_install_package_should_add_trailing_slash_to_the_source_directory_of_single_file() {

self::$instance->generic_strings();

self::$upgrader_skin_mock

->expects( $this->once() )

->method( 'feedback' )

->with( 'installing_package' );

self::$wp_filesystem_mock

->expects( $this->once() )

->method( 'dirlist' )

->with( '/source_dir' )

->willReturn( array( 'file1.php' ) );

add_filter(

'upgrader_source_selection',

function ( $source ) {

$this->assertSame( '/source_dir/', $source );

// Return a WP_Error to exit before `move_dir()/copy_dir()`.

return new WP_Error();

}

);

$args = array(

'source' => '/source_dir',

'destination' => '/dest_dir',

);

self::$instance->install_package( $args );

}

/**

* Tests that `WP_Upgrader::install_package()` applies

* 'upgrader_clear_destination' filters with arguments.

*

* This test runs in a separate process so that it can define

* constants without impacting other tests.

*

* This test does not preserve global state to prevent the exception

* "Serialization of 'Closure' is not allowed." when running in a

* separate process.