Clear the libxml error buffer

Author: sebastianbergmann

ChangeLog-7.5.md

@@ -4,6 +4,10 @@ All notable changes of the PHPUnit 7.5 release series are documented in this fil
 
 ## [7.5.12] - 2019-MM-DD
 
+### Changed
+
+* After each test, `libxml_clear_errors()` is now called (when available) to clear the libxml error buffer
+
 ### Fixed
 
 * Fixed [#3694](https://github.com/sebastianbergmann/phpunit/pull/3694): Constructor arguments for `Throwable` and `Exception` are ignored

src/Framework/TestCase.php

@@ -916,6 +916,7 @@ public function runBare(): void
         $this->unregisterCustomComparators();
         $this->cleanupIniSettings();
         $this->cleanupLocaleSettings();
+        $this->cleanupLibXml();
 
         // Perform assertion on output.
         if (!isset($e)) {
@@ -2140,4 +2141,11 @@ private function runInSeparateProcess(): bool
         return ($this->runTestInSeparateProcess === true || $this->runClassInSeparateProcess === true) &&
                $this->inIsolation !== true && !$this instanceof PhptTestCase;
     }
+
+    private function cleanupLibXml(): void
+    {
+        if (\function_exists('libxml_clear_errors')) {
+            \libxml_clear_errors();
+        }
+    }
 }