diff --git a/src/Symfony/Bridge/PhpUnit/ForwardCompatTestTrait.php b/src/Symfony/Bridge/PhpUnit/ForwardCompatTestTrait.php
index bdff8c18829b..29597bbe10cb 100644
--- a/src/Symfony/Bridge/PhpUnit/ForwardCompatTestTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/ForwardCompatTestTrait.php
@@ -15,7 +15,14 @@
 
 // A trait to provide forward compatibility with newest PHPUnit versions
 
-if (method_exists(\ReflectionMethod::class, 'hasReturnType') && (new \ReflectionMethod(TestCase::class, 'tearDown'))->hasReturnType()) {
+$r = new \ReflectionClass(TestCase::class);
+
+if (\PHP_VERSION_ID < 70000 || !$r->hasMethod('createMock') || !$r->getMethod('createMock')->hasReturnType()) {
+    trait ForwardCompatTestTrait
+    {
+        use Legacy\ForwardCompatTestTraitForV5;
+    }
+} elseif ($r->getMethod('tearDown')->hasReturnType()) {
     trait ForwardCompatTestTrait
     {
         use Legacy\ForwardCompatTestTraitForV8;
@@ -23,6 +30,6 @@ trait ForwardCompatTestTrait
 } else {
     trait ForwardCompatTestTrait
     {
-        use Legacy\ForwardCompatTestTraitForV5;
+        use Legacy\ForwardCompatTestTraitForV7;
     }
 }
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV5.php b/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV5.php
index 5ef837434a94..36db32e55f65 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV5.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV5.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Bridge\PhpUnit\Legacy;
 
+use PHPUnit\Framework\MockObject\MockObject;
+
 /**
  * @internal
  */
@@ -80,6 +82,25 @@ private function doTearDown()
         parent::tearDown();
     }
 
+    /**
+     * @param string $originalClassName
+     *
+     * @return MockObject
+     */
+    protected function createMock($originalClassName)
+    {
+        $mock = $this->getMockBuilder($originalClassName)
+            ->disableOriginalConstructor()
+            ->disableOriginalClone()
+            ->disableArgumentCloning();
+
+        if (method_exists($mock, 'disallowMockingUnknownTypes')) {
+            $mock = $mock->disallowMockingUnknownTypes();
+        }
+
+        return $mock->getMock();
+    }
+
     /**
      * @param string $message
      *
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV7.php b/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV7.php
new file mode 100644
index 000000000000..84a26faebe99
--- /dev/null
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV7.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\PhpUnit\Legacy;
+
+use PHPUnit\Framework\MockObject\MockObject;
+
+/**
+ * @internal
+ */
+trait ForwardCompatTestTraitForV7
+{
+    use ForwardCompatTestTraitForV5;
+
+    /**
+     * @param string|string[] $originalClassName
+     */
+    protected function createMock($originalClassName): MockObject
+    {
+        return $this->getMockBuilder($originalClassName)
+            ->disableOriginalConstructor()
+            ->disableOriginalClone()
+            ->disableArgumentCloning()
+            ->disallowMockingUnknownTypes()
+                ->getMock();
+    }
+}
diff --git a/src/Symfony/Component/Validator/Tests/DataCollector/ValidatorDataCollectorTest.php b/src/Symfony/Component/Validator/Tests/DataCollector/ValidatorDataCollectorTest.php
index f32acf228bcc..00407b3ab0f3 100644
--- a/src/Symfony/Component/Validator/Tests/DataCollector/ValidatorDataCollectorTest.php
+++ b/src/Symfony/Component/Validator/Tests/DataCollector/ValidatorDataCollectorTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Validator\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationList;
 use Symfony\Component\Validator\DataCollector\ValidatorDataCollector;
@@ -20,6 +21,8 @@
 
 class ValidatorDataCollectorTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     public function testCollectsValidatorCalls()
     {
         $originalValidator = $this->createMock(ValidatorInterface::class);
@@ -71,9 +74,4 @@ public function testReset()
         $this->assertCount(0, $collector->getCalls());
         $this->assertSame(0, $collector->getViolationsCount());
     }
-
-    protected function createMock($classname)
-    {
-        return $this->getMockBuilder($classname)->disableOriginalConstructor()->getMock();
-    }
 }
diff --git a/src/Symfony/Component/Validator/Tests/Validator/TraceableValidatorTest.php b/src/Symfony/Component/Validator/Tests/Validator/TraceableValidatorTest.php
index b80efed27e7b..2e76466b1c6b 100644
--- a/src/Symfony/Component/Validator/Tests/Validator/TraceableValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Validator/TraceableValidatorTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Validator\Tests\Validator;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationList;
@@ -23,6 +24,8 @@
 
 class TraceableValidatorTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     public function testValidate()
     {
         $originalValidator = $this->createMock(ValidatorInterface::class);
@@ -95,9 +98,4 @@ public function testForwardsToOriginalValidator()
         $expects('validatePropertyValue')->willReturn($expected = new ConstraintViolationList());
         $this->assertSame($expected, $validator->validatePropertyValue(new \stdClass(), 'property', 'value'), 'returns original validator validatePropertyValue() result');
     }
-
-    protected function createMock($classname)
-    {
-        return $this->getMockBuilder($classname)->disableOriginalConstructor()->getMock();
-    }
 }