Update changelog, add some tests for rcube_utils::parse_host()

CHANGELOG

@@ -8,6 +8,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where bmp images couldn't be displayed on some systems (#6728)
 - Fix bug in parsing vCard data using PHP 7.3 due to an invalid regexp (#6744)
 - Fix bug where bold/strong text was converted to upper-case on html-to-text conversion (6758)
+- Fix bug in rcube_utils::parse_hosts() where %t, %d, %z could return only tld (#6746)
 
 RELEASE 1.3.9
 -------------

tests/Framework/Utils.php

@@ -603,4 +603,27 @@ class Framework_Utils extends PHPUnit_Framework_TestCase
         $this->assertEquals(rcube_utils::idn_to_ascii('H.S'), 'H.S');
         $this->assertEquals(rcube_utils::idn_to_ascii('d.-h.lastname'), 'd.-h.lastname');
     }
+
+    /**
+     * Test-Cases for test_parse_host()
+     */
+    function data_parse_host()
+    {
+        return array(
+            array('%z', 'hostname', 'hostname'),
+            array('%z', 'domain.tld', 'domain.tld'),
+            array('%z', 'host.domain.tld', 'domain.tld'),
+            array('%z', 'host1.host2.domain.tld', 'host2.domain.tld'),
+        );
+    }
+
+    /**
+     * Test parse_host()
+     *
+     * @dataProvider data_parse_host
+     */
+    function test_parse_host($name, $host, $result)
+    {
+        $this->assertEquals(rcube_utils::parse_host($name, $host), $result);
+    }
 }