Build/Test Tools: Continue eliminating randomness in tests.

See #37371


git-svn-id: https://develop.svn.wordpress.org/trunk@38938 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/adminbar.php

@@ -349,8 +349,8 @@ class Tests_AdminBar extends WP_UnitTestCase {
 		$post = array(
 			'post_author' => self::$editor_id,
 			'post_status' => 'publish',
-			'post_content' => rand_str(),
-			'post_title' => rand_str(),
+			'post_content' => 'Post Content',
+			'post_title' => 'Post Title',
 		);
 		$id = wp_insert_post( $post );