--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/tests/VObject/StringUtilTest.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,55 @@
+<?php
+
+namespace Sabre\VObject;
+
+class StringUtilTest extends \PHPUnit_Framework_TestCase {
+
+    function testNonUTF8() {
+
+        $string = StringUtil::isUTF8(chr(0xbf));
+
+        $this->assertEquals(false, $string);
+
+    }
+
+    function testIsUTF8() {
+
+        $string = StringUtil::isUTF8('I 💚 SabreDAV');
+
+        $this->assertEquals(true, $string);
+
+    }
+
+    function testUTF8ControlChar() {
+
+        $string = StringUtil::isUTF8(chr(0x00));
+
+        $this->assertEquals(false, $string);
+
+    }
+
+    function testConvertToUTF8nonUTF8() {
+
+        $string = StringUtil::convertToUTF8(chr(0xbf));
+
+        $this->assertEquals(utf8_encode(chr(0xbf)), $string);
+
+    }
+
+    function testConvertToUTF8IsUTF8() {
+
+        $string = StringUtil::convertToUTF8('I 💚 SabreDAV');
+
+        $this->assertEquals('I 💚 SabreDAV', $string);
+
+    }
+
+    function testConvertToUTF8ControlChar() {
+
+        $string = StringUtil::convertToUTF8(chr(0x00));
+
+        $this->assertEquals('', $string);
+
+    }
+
+}