From 23d08274fc2179a8259a29cb3a9d77a1e802b628 Mon Sep 17 00:00:00 2001
From: Sebastian Bergmann <sb@sebastian-bergmann.de>
Date: Mon, 20 May 2019 15:06:30 +0200
Subject: [PATCH] Clear the libxml error buffer

---
 ChangeLog-7.5.md           | 4 ++++
 src/Framework/TestCase.php | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/ChangeLog-7.5.md b/ChangeLog-7.5.md
index e3479a909e9..27f1986c09b 100644
--- a/ChangeLog-7.5.md
+++ b/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
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index 0c73877dede..da1c74f1bd7 100644
--- a/src/Framework/TestCase.php
+++ b/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();
+        }
+    }
 }