Tests: work around PHPUnit hard-failing on unknown class

composer.json

@@ -29,6 +29,7 @@
 	},
 	"require-dev": {
 		"brianium/paratest": "^6.3.0",
+		"cweagans/composer-patches": "^1.7",
 		"infection/infection": "^0.26.0",
 		"orisai/coding-standard": "^3.0.0",
 		"phpstan/extension-installer": "^1.0.0",
@@ -60,7 +61,8 @@
 		"allow-plugins": {
 			"dealerdirect/phpcodesniffer-composer-installer": true,
 			"infection/extension-installer": true,
-			"phpstan/extension-installer": true
+			"phpstan/extension-installer": true,
+			"cweagans/composer-patches": true
 		}
 	}
 }

tests/Patches/coverage-invalid-file-error.patch

@@ -0,0 +1,29 @@
+From 085e85e23d86b49cae114fcbe322325462c058cc Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Barto=C5=A1?= <[email protected]>
+Date: Fri, 23 Dec 2022 16:27:23 +0100
+Subject: [PATCH] Fix coverage failure in case of an invalid file
+
+---
+ src/CodeCoverage.php | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/src/CodeCoverage.php b/src/CodeCoverage.php
+index c35f27c8..9340f673 100644
+--- a/src/CodeCoverage.php
++++ b/src/CodeCoverage.php
+@@ -550,7 +550,11 @@ private function processUncoveredFilesFromFilter(): void
+
+         foreach ($uncoveredFiles as $uncoveredFile) {
+             if ($this->filter->isFile($uncoveredFile)) {
+-                include_once $uncoveredFile;
++                try {
++                    include_once $uncoveredFile;
++                } catch (\Error $e) {
++                    // Include may fail if file content is not valid (due to implementing/extending non-existent class, ...)
++                }
+             }
+         }
+
+-- 
+2.34.1.windows.1
+