<?php

/**

* Tests for the fetch_feed() function.

*

* @package WordPress

* @subpackage UnitTests

* @since 6.7.0

*

* @group feed

*

* @covers ::fetch_feed

*/

class Tests_Feed_FetchFeed extends WP_UnitTestCase {

public function set_up() {

parent::set_up();

add_filter( 'pre_http_request', array( $this, 'mocked_rss_response' ) );

}

/**

* @ticket 62354

*/

public function test_empty_charset_does_not_trigger_fatal_error() {

add_filter( 'pre_option_blog_charset', '__return_empty_string', 20 );

$feed = fetch_feed( 'https://wordpress.org/news/feed/' );

foreach ( $feed->get_items( 0, 1 ) as $item ) {

$content = $item->get_content();

}

$this->assertStringContainsString( '<a href="https://learn.wordpress.org/">Learn WordPress</a> is a learning resource providing workshops, quizzes, courses, lesson plans, and discussion groups so that anyone, from beginners to advanced users, can learn to do more with WordPress.', $content );

}

/**

* Ensure WP_Error object returned for 404 response.

*

* @ticket 64136

*/

public function test_fetch_feed_returns_error_for_404_response() {

// Priority 15 to ensure this runs after the mocked_rss_response filter.

add_filter( 'pre_http_request', array( $this, 'mocked_rss_404_error_response' ), 15 );

$feed = fetch_feed( 'https://example.org/news/feed/' );

$this->assertWPError( $feed, 'A WP_Error object is expected for failing requests.' );

$this->assertSame( 'simplepie-error', $feed->get_error_code() );

}

/**

* Ensure fetch_feed() returns WP_Error if any feed errors.

*

* @ticket 64136

*/

public function test_fetch_feed_multiple_returns_error_if_any_feed_errors() {

// Priority 15 to ensure this runs after the mocked_rss_response filter.

add_filter( 'pre_http_request', array( $this, 'mocked_rss_404_error_response' ), 15 );

add_filter(

'pre_http_request',

/**

* Remove the 404 error response after the first call.

*/

function ( $response ) {

remove_filter( 'pre_http_request', array( $this, 'mocked_rss_404_error_response' ), 15 );

return $response;

},

20 // Priority 20 to ensure it runs after the 404 error response.

);

$feed = fetch_feed( array( 'https://example.org/news/feed/', 'https://wordpress.org/news/feed/' ) );

$this->assertWPError( $feed, 'A WP_Error object is expected for any failing requests.' );

$this->assertSame( 'simplepie-error', $feed->get_error_code() );

$this->assertCount( 1, $feed->get_error_messages()[0], 'There should be one error message for the failed feed.' );

}

/**

* Ensure fetch_feed() includes messages for all feeds that error.

*

* @ticket 64136

*/

public function test_fetch_feed_multiple_returns_error_if_all_feeds_error() {

// Priority 15 to ensure this runs after the mocked_rss_response filter.

add_filter( 'pre_http_request', array( $this, 'mocked_rss_404_error_response' ), 15 );

$feed = fetch_feed( array( 'https://example.org/news/feed/', 'https://example.com/news/feed/' ) );

$this->assertWPError( $feed, 'A WP_Error object is expected for failing requests.' );

$this->assertSame( 'simplepie-error', $feed->get_error_code() );

$this->assertCount( 2, $feed->get_error_messages()[0], 'There should be two error messages, one for each failed feed.' );

}

/**

* Ensure fetch_feed() returns a SimplePie object for an empty URL (string).

*

* @ticket 64136

*/

public function test_fetch_feed_returns_a_simplepie_object_for_unspecified_url_string() {

$feed = fetch_feed( '' );

$this->assertInstanceOf( 'SimplePie\\SimplePie', $feed );

}

/**

* Ensure fetch_feed() returns a SimplePie object for an empty URL (array).

*

* @ticket 64136

*/

public function test_fetch_feed_returns_a_simplepie_object_for_unspecified_url_array() {

$feed = fetch_feed( array() );

$this->assertInstanceOf( 'SimplePie\\SimplePie', $feed );

}

/**

* Ensure fetch_feed() accepts multiple feeds.

*

* The main purpose of this test is to ensure that the SimplePie deprecation warning

* is not thrown when requesting multiple feeds.

*

* Secondly it confirms that the markup of the first two items match as they will

* both be from the same feed URL as the array contains the WordPress News feed twice.

*

* @ticket 64136

*/

public function test_fetch_feed_supports_multiple_feeds() {

$feed = fetch_feed( array( 'https://wordpress.org/news/feed/', 'https://wordpress.org/news/feed/atom/' ) );

$content = array();

foreach ( $feed->get_items( 0, 2 ) as $item ) {

$content[] = $item->get_content();

}

$this->assertEqualHTML( $content[0], $content[1], null, 'The contents of the first two items should be identical.' );

$this->assertCount( 20, $feed->get_items(), 'The feed should contain 20 items.' );

}

/**

* Ensure that fetch_feed() is cached on second and subsequent calls.

*

* Note: The HTTP request is mocked on the `pre_http_request` filter so

* this test doesn't make any HTTP requests so it doesn't need to be

* placed in the external-http group.

*

* @ticket 63717

*

* @group feed

*

* @covers ::fetch_feed

*/

public function test_fetch_feed_cached() {

$filter = new MockAction();

add_filter( 'pre_http_request', array( $filter, 'filter' ) );

fetch_feed( 'https://wordpress.org/news/feed/' );

$this->assertSame( 1, $filter->get_call_count(), 'The feed should be fetched on the first call.' );

fetch_feed( 'https://wordpress.org/news/feed/' );

$this->assertSame( 1, $filter->get_call_count(), 'The feed should be cached on the second call. For SP 1.8.x upgrades, backport simplepie/simplepie#830 to resolve.' );

}

/**

* Ensure that fetch_feed uses the global cache on Multisite.

*

* @ticket 63719

*

* @group feed

* @group ms-required

*

* @covers ::fetch_feed

* @covers WP_Feed_Cache_Transient

*/

public function test_fetch_feed_uses_global_cache() {

$second_blog_id = self::factory()->blog->create();

$filter = new MockAction();

add_filter( 'pre_http_request', array( $filter, 'filter' ) );

fetch_feed( 'https://wordpress.org/news/feed/' );

switch_to_blog( $second_blog_id );

fetch_feed( 'https://wordpress.org/news/feed/' );

$this->assertSame( 1, $filter->get_call_count(), 'The feed cache should be global.' );

}

/**

* Mock response for `fetch_feed()`.

*

* This simulates a response from WordPress.org's server for the news feed

* to avoid making actual HTTP requests during the tests.

*

* The method runs on the `pre_http_request` filter, a low level filter

* to allow developers to determine whether a request would have been made

* under normal circumstances.

*

* @return array Mocked response data.

*/

public function mocked_rss_response() {

$single_value_headers = array(

'Content-Type' => 'application/rss+xml; charset=UTF-8',

'link' => '<https://wordpress.org/news/wp-json/>; rel="https://api.w.org/"',

);

return array(

'headers' => new WpOrg\Requests\Utility\CaseInsensitiveDictionary( $single_value_headers ),

'body' => file_get_contents( DIR_TESTDATA . '/feed/wordpress-org-news.xml' ),

'response' => array(

'code' => 200,

'message' => 'OK',

),

'cookies' => array(),

'filename' => null,

);

}

/**

* Mock 404 error response for `fetch_feed()`.

*

* This simulates a 404 response to test error handling in `fetch_feed()`.

*

* @return array Mocked 404 error response data.

*/

public function mocked_rss_404_error_response() {

return array(

'headers' => new WpOrg\Requests\Utility\CaseInsensitiveDictionary(),

'body' => '',

'response' => array(

'code' => 404,

'message' => 'Not Found',

),

'cookies' => array(),

'filename' => null,

);

}

}