diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9d5147f..96e88b0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,7 +23,6 @@ jobs:
         with:
           php-version: ${{ matrix.php-version }}
           coverage: pcov
-          extensions: uopz
       - name: Composer cache
         uses: actions/cache@v2
         with:
diff --git a/src/Matchers/XmlBodyMatcher.php b/src/Matchers/XmlBodyMatcher.php
index 2fc932b..e0b1268 100644
--- a/src/Matchers/XmlBodyMatcher.php
+++ b/src/Matchers/XmlBodyMatcher.php
@@ -44,6 +44,9 @@ class XmlBodyMatcher extends BodyMatcher
 </xsl:stylesheet>
 EOT;
 
+    /** @var bool */
+    public static $forceTextComparison = false;
+
     /** @var XSLTProcessor|null */
     private static $sorter;
 
@@ -59,14 +62,14 @@ EOT;
      */
     public function __construct($referenceXml)
     {
-        if (!extension_loaded('xsl') || !extension_loaded('dom')) {
+        if (!static::hasExtension('xsl') || !static::hasExtension('dom')) {
             $this->useFallback = true;
         }
 
-        if (!extension_loaded('xsl')) {
+        if (!static::hasExtension('xsl')) {
             $this->useFallback = true;
 
-            if (extension_loaded('dom') && $referenceXml instanceof DOMDocument) {
+            if (static::hasExtension('dom') && $referenceXml instanceof DOMDocument) {
                 $referenceXml = static::getDOMString($referenceXml);
             }
 
@@ -190,4 +193,18 @@ EOT;
 
         return $result;
     }
+
+    /**
+     * @param string $extension
+     *
+     * @return bool
+     */
+    private static function hasExtension(string $extension): bool
+    {
+        if (static::$forceTextComparison && 'xsl' === $extension) {
+            return false;
+        }
+
+        return extension_loaded($extension);
+    }
 }
diff --git a/tests/src/PockBuilderTest.php b/tests/src/PockBuilderTest.php
index cc9a0cc..ac1462c 100644
--- a/tests/src/PockBuilderTest.php
+++ b/tests/src/PockBuilderTest.php
@@ -10,12 +10,10 @@
 namespace Pock\Tests;
 
 use DOMDocument;
-use phpmock\Mock;
-use phpmock\MockBuilder;
-use phpmock\MockRegistry;
 use Pock\Enum\RequestMethod;
 use Pock\Enum\RequestScheme;
 use Pock\Exception\UnsupportedRequestException;
+use Pock\Matchers\XmlBodyMatcher;
 use Pock\PockBuilder;
 use Pock\PockResponseBuilder;
 use Pock\TestUtils\PockTestCase;
@@ -35,9 +33,9 @@ use RuntimeException;
  */
 class PockBuilderTest extends PockTestCase
 {
-    protected function tearDown(): void
+    protected function setUp(): void
     {
-        uopz_unset_return('extension_loaded');
+        XmlBodyMatcher::$forceTextComparison = false;
     }
 
     public function testNoHit(): void
@@ -463,17 +461,7 @@ EOF;
         $document = new DOMDocument();
         $document->loadXML($simpleObject);
 
-        uopz_set_return(
-            'extension_loaded',
-            function (string $extension) {
-                if ('xsl' === $extension) {
-                    return false;
-                }
-
-                return true;
-            },
-            true
-        );
+        XmlBodyMatcher::$forceTextComparison = true;
 
         $builder = new PockBuilder();
         $builder->matchMethod(RequestMethod::GET)