Closes #3893

ChangeLog-8.4.md

@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 8.4 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [8.4.2] - 2019-MM-DD
+
+### Fixed
+
+* Fixed [#3893](https://github.com/sebastianbergmann/phpunit/issues/3893): `TypeError` when called with a filename without extension
+
 ## [8.4.1] - 2019-10-07
 
 ### Fixed
@@ -21,6 +27,7 @@ All notable changes of the PHPUnit 8.4 release series are documented in this fil
 
 * The method `expectExceptionMessageRegExp()` is now deprecated. There is no behavioral change in this version of PHPUnit. Using this method will trigger a deprecation warning in PHPUnit 9 and in PHPUnit 10 it will be removed. Please use `expectExceptionMessageMatches()` instead.
 
+[8.4.2]: https://github.com/sebastianbergmann/phpunit/compare/8.4.1...8.4
 [8.4.1]: https://github.com/sebastianbergmann/phpunit/compare/8.4.0...8.4.1
 [8.4.0]: https://github.com/sebastianbergmann/phpunit/compare/8.3.5...8.4.0
 

src/TextUI/Command.php

@@ -803,6 +803,7 @@ protected function handleArguments(array $argv): void
 
             if (isset($this->arguments['test']) &&
                 \is_file($this->arguments['test']) &&
+                \strrpos($this->arguments['test'], '.') !== false &&
                 \substr($this->arguments['test'], -5, 5) !== '.phpt') {
                 $this->arguments['testFile'] = \realpath($this->arguments['test']);
                 $this->arguments['test']     = \substr($this->arguments['test'], 0, \strrpos($this->arguments['test'], '.'));