Tests: Add case for wp_privacy_delete_old_export_files().

Props allendav.
See #43546.


git-svn-id: https://develop.svn.wordpress.org/trunk@43292 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/privacy/wpPrivacyDeleteOldExportFiles.php

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+<?php
+/**
+ * Define a class to test `wp_privacy_delete_old_export_files()`.
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 4.9.6
+ */
+
+/**
+ * Test cases for `wp_privacy_delete_old_export_files()`.
+ *
+ * @group privacy
+ * @covers wp_privacy_delete_old_export_files
+ *
+ * @since 4.9.6
+ */
+class Tests_Privacy_WpPrivacyDeleteOldExportFiles extends WP_UnitTestCase {
+	/**
+	 * Path to the index file that blocks directory listing on poorly-configured servers.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @var string $index_path
+	 */
+	protected static $index_path;
+
+	/**
+	 * Path to an export file that is past the expiration date.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @var string $expired_export_file
+	 */
+	protected static $expired_export_file;
+
+	/**
+	 * Path to an export file that is active.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @var string $expired_export_file
+	 */
+	protected static $active_export_file;
+
+	/**
+	 * Create fixtures that are shared by multiple test cases.
+	 *
+	 * @param WP_UnitTest_Factory $factory The base factory object.
+	 */
+	public static function wpSetUpBeforeClass( $factory ) {
+		$exports_dir = wp_privacy_exports_dir();
+
+		if ( ! is_dir( $exports_dir ) ) {
+			wp_mkdir_p( $exports_dir );
+		}
+
+		self::$index_path          = $exports_dir . 'index.html';
+		self::$expired_export_file = $exports_dir . 'wp-personal-data-file-user-at-example-com-0123456789abcdef.zip';
+		self::$active_export_file  = $exports_dir . 'wp-personal-data-file-user-at-example-com-fedcba9876543210.zip';
+	}
+
+	/**
+	 * Perform setup operations that are shared across all tests.
+	 */
+	public function setUp() {
+		parent::setUp();
+
+		touch( self::$index_path, time() - 30 * WEEK_IN_SECONDS );
+		touch( self::$expired_export_file, time() - 5 * DAY_IN_SECONDS );
+		touch( self::$active_export_file, time() - 2 * DAY_IN_SECONDS );
+	}
+
+	/**
+	 * Restore the system state to what it was before this case was setup.
+	 */
+	public static function wpTearDownAfterClass() {
+		wp_delete_file( self::$expired_export_file );
+		wp_delete_file( self::$active_export_file );
+	}
+
+	/**
+	 * The function should not throw notices when the exports directory doesn't exist.
+	 *
+	 * @since 4.9.6
+	 */
+	public function test_non_existent_folders_should_not_cause_errors() {
+		add_filter( 'wp_privacy_exports_dir', array( $this, 'filter_bad_exports_dir' ) );
+		wp_privacy_delete_old_export_files();
+		remove_filter( 'wp_privacy_exports_dir', array( $this, 'filter_bad_exports_dir' ) );
+
+		/*
+		 * The test will automatically fail if the function triggers a notice,
+		 * so this dummy assertion is just for accurate stats.
+		 */
+		$this->assertTrue( true );
+	}
+
+	/**
+	 * Return the path to a non-existent folder.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string $exports_dir The default personal data export directory.
+	 *
+	 * @return string The path to a folder that doesn't exist.
+	 */
+	public function filter_bad_exports_dir( $exports_dir ) {
+		$upload_dir = wp_upload_dir();
+
+		return trailingslashit( $upload_dir['basedir'] ) . 'invalid-12345';
+	}
+
+	/**
+	 * The function should delete files that are past the expiration date.
+	 *
+	 * @since 4.9.6
+	 */
+	public function test_expired_files_should_be_deleted() {
+		wp_privacy_delete_old_export_files();
+
+		$this->assertFalse( file_exists( self::$expired_export_file ) );
+	}
+
+	/**
+	 * The function should not delete files that are not past the expiration date.
+	 *
+	 * @since 4.9.6
+	 */
+	public function test_unexpired_files_should_not_be_deleted() {
+		wp_privacy_delete_old_export_files();
+
+		$this->assertTrue( file_exists( self::$active_export_file ) );
+	}
+
+	/**
+	 * The function should never delete the index file, even if it's past the expiration date.
+	 *
+	 * @since 4.9.6
+	 */
+	public function test_index_file_should_never_be_deleted() {
+		wp_privacy_delete_old_export_files();
+
+		$this->assertTrue( file_exists( self::$index_path ) );
+	}
+}