Build/Test Tools: Run the Ajax test group for multisite.

This will help catch issues with Ajax related functionality on multisite.

A few tests have also been marked as `skipWithMultisite()` as they require network admin level capabilities when performing the same operations on a multisite install.

Props garrett-eclipse, netweb.
Fixes #46567.

git-svn-id: https://develop.svn.wordpress.org/trunk@49835 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/ajax/Attachments.php

@@ -65,6 +65,8 @@ class Tests_Ajax_Attachments extends WP_Ajax_UnitTestCase {
 	 * @ticket 36578
 	 */
 	public function test_wp_ajax_send_attachment_to_editor_should_return_a_link() {
+		$this->skipWithMultisite();
+
 		// Become an administrator.
 		$post    = $_POST;
 		$user_id = self::factory()->user->create(

tests/phpunit/tests/ajax/DeletePlugin.php

@@ -126,6 +126,7 @@ class Tests_Ajax_Delete_Plugin extends WP_Ajax_UnitTestCase {
 	}
 
 	public function test_delete_plugin() {
+		$this->skipWithMultisite();
 		$this->_setRole( 'administrator' );
 
 		$_POST['_ajax_nonce'] = wp_create_nonce( 'updates' );

tests/phpunit/tests/ajax/ManageThemes.php

@@ -102,6 +102,7 @@ class Tests_Ajax_Manage_Themes extends WP_Ajax_UnitTestCase {
 	}
 
 	public function test_update_theme() {
+		$this->skipWithMultisite();
 		$this->_setRole( 'administrator' );
 
 		$_POST['_ajax_nonce'] = wp_create_nonce( 'updates' );
@@ -139,6 +140,7 @@ class Tests_Ajax_Manage_Themes extends WP_Ajax_UnitTestCase {
 	}
 
 	function test_uppercase_theme_slug() {
+		$this->skipWithMultisite();
 		$this->_setRole( 'administrator' );
 
 		$_POST['_ajax_nonce'] = wp_create_nonce( 'updates' );

tests/phpunit/tests/ajax/UpdatePlugin.php

@@ -130,6 +130,7 @@ class Tests_Ajax_Update_Plugin extends WP_Ajax_UnitTestCase {
 	}
 
 	public function test_update_plugin() {
+		$this->skipWithMultisite();
 		$this->_setRole( 'administrator' );
 
 		$_POST['_ajax_nonce'] = wp_create_nonce( 'updates' );