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Tests: Add unit tests for wp_ajax_wp_link_ajax() #11898

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5d71ebb
Tests: Add unit tests for wp_ajax_wp_link_ajax()
May 20, 2026
57c7f64
Tests: Fix exception handling in wpLinkAjax tests
May 20, 2026
5e856fe
Tests: Fix no-results assertion in wpLinkAjax tests
May 20, 2026
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160 changes: 160 additions & 0 deletions tests/phpunit/tests/admin/includes/ajax-actions/wpLinkAjax.php
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Original file line number Diff line number Diff line change
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<?php

/**
* Admin Ajax functions to be tested.
*/
require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';

/**
* Testing wp_ajax_wp_link_ajax() functionality.
*
* @package WordPress
* @subpackage UnitTests
* @since 3.1.0
*
* @group ajax
*
* @covers ::wp_ajax_wp_link_ajax
*/
class Tests_wp_ajax_wp_link_ajax extends WP_Ajax_UnitTestCase {

/**
* Tests successful search using the 'search' parameter.
*
* @ticket 65252
*/
public function test_wp_link_ajax_search_success(): void {
$post = self::factory()->post->create_and_get(
array(
'post_title' => 'Test Link Search',
'post_status' => 'publish',
)
);

$_POST = array(
'action' => 'wp-link-ajax',
'_ajax_linking_nonce' => wp_create_nonce( 'internal-linking' ),
'search' => 'Test Link Search',
);

try {
$this->_handleAjax( 'wp-link-ajax' );
} catch ( WPAjaxDieContinueException $e ) {
// We expect it to die after echoing JSON.
}

$response = json_decode( trim( $this->_last_response ), true );

$this->assertIsArray( $response );
$this->assertCount( 1, $response );
$this->assertSame( $post->ID, $response[0]['ID'] );
$this->assertSame( $post->post_title, $response[0]['title'] );
}

/**
* Tests successful search using the 'term' parameter.
*
* @ticket 65252
*/
public function test_wp_link_ajax_term_success(): void {
$post = self::factory()->post->create_and_get(
array(
'post_title' => 'Another Test Link',
'post_status' => 'publish',
)
);

$_POST = array(
'action' => 'wp-link-ajax',
'_ajax_linking_nonce' => wp_create_nonce( 'internal-linking' ),
'term' => 'Another Test Link',
);

try {
$this->_handleAjax( 'wp-link-ajax' );
} catch ( WPAjaxDieContinueException $e ) {
// We expect it to die after echoing JSON.
}

$response = json_decode( trim( $this->_last_response ), true );

$this->assertIsArray( $response );
$this->assertCount( 1, $response );
$this->assertSame( $post->ID, $response[0]['ID'] );
}

/**
* Tests successful search with pagination.
*
* @ticket 65252
*/
public function test_wp_link_ajax_pagination(): void {
// Create 21 posts to ensure at least 2 pages (default is 20 per page).
self::factory()->post->create_many(
21,
array(
'post_title' => 'Paginated Post',
'post_status' => 'publish',
)
);

$_POST = array(
'action' => 'wp-link-ajax',
'_ajax_linking_nonce' => wp_create_nonce( 'internal-linking' ),
'search' => 'Paginated Post',
'page' => 2,
);

try {
$this->_handleAjax( 'wp-link-ajax' );
} catch ( WPAjaxDieContinueException $e ) {
// We expect it to die after echoing JSON.
}

$response = json_decode( trim( $this->_last_response ), true );

$this->assertIsArray( $response );
// On page 2, we should have 1 post.
$this->assertCount( 1, $response );
}

/**
* Tests search failure due to invalid nonce.
*
* @ticket 65252
*/
public function test_wp_link_ajax_invalid_nonce(): void {
$_POST = array(
'action' => 'wp-link-ajax',
'_ajax_linking_nonce' => 'invalid-nonce',
'search' => 'Test',
);

$this->expectException( WPAjaxDieStopException::class );
$this->expectExceptionMessage( '-1' );

$this->_handleAjax( 'wp-link-ajax' );
}

/**
* Tests behavior when no results are found.
*
* @ticket 65252
*/
public function test_wp_link_ajax_no_results(): void {
$_POST = array(
'action' => 'wp-link-ajax',
'_ajax_linking_nonce' => wp_create_nonce( 'internal-linking' ),
'search' => 'NonExistentPostTitle',
);

try {
$this->_handleAjax( 'wp-link-ajax' );
} catch ( WPAjaxDieContinueException $e ) {
$this->assertSame( '0', $e->getMessage() );
return;
}

$this->fail( 'Expected WPAjaxDieContinueException was not thrown.' );
}
}
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