diff --git a/tests/phpunit/tests/functions/isHttpsUrl.php b/tests/phpunit/tests/functions/isHttpsUrl.php
deleted file mode 100644
index 22d9d9785c..0000000000
--- a/tests/phpunit/tests/functions/isHttpsUrl.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-/**
- * Test is_https_url().
- *
- * @group functions.php
- * @ticket 28487
- */
-class Tests_Functions_IsHttpsUrl extends WP_UnitTestCase {
-
-	function test_is_https_url() {
-
-		$this->assertTrue( is_https_url( 'https://example.com/' ) );
-		$this->assertTrue( is_https_url( 'https://localhost/' ) );
-
-		$this->assertFalse( is_https_url( 'http://example.com' ) );
-		$this->assertFalse( is_https_url( 'Hello World!' ) );
-		$this->assertFalse( is_https_url( 'httpsinvalid' ) );
-
-	}
-
-}