diff --git a/config/sets/phpunit120.php b/config/sets/phpunit120.php
index 611a42b8..5990bd7b 100644
--- a/config/sets/phpunit120.php
+++ b/config/sets/phpunit120.php
@@ -14,5 +14,9 @@
 
         // stubs over mocks
         CreateStubOverCreateMockArgRector::class,
+
+        // experimental, from PHPUnit 12.5.2
+        // @see https://github.com/sebastianbergmann/phpunit/commit/24c208d6a340c3071f28a9b5cce02b9377adfd43
+        // AllowMockObjectsWithoutExpectationsAttributeRector::class,
     ]);
 };
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/AllowMockObjectsWithoutExpectationsAttributeRectorTest.php b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/AllowMockObjectsWithoutExpectationsAttributeRectorTest.php
new file mode 100644
index 00000000..1d6c75c6
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/AllowMockObjectsWithoutExpectationsAttributeRectorTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class AllowMockObjectsWithoutExpectationsAttributeRectorTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_all_tests_methods_define_expectations.php.inc b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_all_tests_methods_define_expectations.php.inc
new file mode 100644
index 00000000..da0e0722
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_all_tests_methods_define_expectations.php.inc
@@ -0,0 +1,25 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class SkipIfAllTestsMethodsDefineExpectations extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(\stdClass::class);
+    }
+
+    public function testOne()
+    {
+        $this->someMock->method('doSomething')->willReturn('value');
+    }
+
+    public function testTwo()
+    {
+        $this->someMock->method('doSomethingElse')->willReturn('another value');
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_mock_not_used_in_2_test_methods.php.inc b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_mock_not_used_in_2_test_methods.php.inc
new file mode 100644
index 00000000..2d61aa44
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_if_mock_not_used_in_2_test_methods.php.inc
@@ -0,0 +1,24 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class SkipIfMockNotUsedIn2TestMethods extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(\stdClass::class);
+    }
+
+    public function testOne()
+    {
+    }
+
+    public function testTwo()
+    {
+
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_only_single_test.php.inc b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_only_single_test.php.inc
new file mode 100644
index 00000000..106dfbbe
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/skip_only_single_test.php.inc
@@ -0,0 +1,19 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class SkipOnlySingleTest extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(\stdClass::class);
+    }
+
+    public function testOne()
+    {
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/some_class.php.inc b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/some_class.php.inc
new file mode 100644
index 00000000..18f0548d
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/Fixture/some_class.php.inc
@@ -0,0 +1,54 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class SomeClass extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(\stdClass::class);
+    }
+
+    public function testOne()
+    {
+        $this->someMock->method('doSomething')->willReturn('value');
+    }
+
+    public function testTwo()
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+#[\PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations]
+final class SomeClass extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(\stdClass::class);
+    }
+
+    public function testOne()
+    {
+        $this->someMock->method('doSomething')->willReturn('value');
+    }
+
+    public function testTwo()
+    {
+    }
+}
+
+?>
diff --git a/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/config/configured_rule.php b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/config/configured_rule.php
new file mode 100644
index 00000000..baae2bb5
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector/config/configured_rule.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector;
+
+return RectorConfig::configure()
+    ->withRules([AllowMockObjectsWithoutExpectationsAttributeRector::class]);
diff --git a/rules/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector.php b/rules/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector.php
new file mode 100644
index 00000000..91ba39f9
--- /dev/null
+++ b/rules/PHPUnit120/Rector/Class_/AllowMockObjectsWithoutExpectationsAttributeRector.php
@@ -0,0 +1,239 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\PHPUnit120\Rector\Class_;
+
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node;
+use PhpParser\Node\Attribute;
+use PhpParser\Node\AttributeGroup;
+use PhpParser\Node\Name;
+use PhpParser\Node\Name\FullyQualified;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassMethod;
+use PHPStan\Reflection\ReflectionProvider;
+use Rector\Doctrine\NodeAnalyzer\AttributeFinder;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\PHPUnit\Enum\PHPUnitAttribute;
+use Rector\PHPUnit\Enum\PHPUnitClassName;
+use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
+use Rector\Rector\AbstractRector;
+use Rector\ValueObject\MethodName;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see \Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AllowMockObjectsWithoutExpectationsAttributeRector\AllowMockObjectsWithoutExpectationsAttributeRectorTest
+ *
+ * @see https://github.com/sebastianbergmann/phpunit/commit/24c208d6a340c3071f28a9b5cce02b9377adfd43
+ */
+final class AllowMockObjectsWithoutExpectationsAttributeRector extends AbstractRector
+{
+    public function __construct(
+        private readonly TestsNodeAnalyzer $testsNodeAnalyzer,
+        private readonly AttributeFinder $attributeFinder,
+        private readonly ReflectionProvider $reflectionProvider,
+        private readonly BetterNodeFinder $betterNodeFinder,
+    ) {
+    }
+
+    public function getNodeTypes(): array
+    {
+        return [Class_::class];
+    }
+
+    /**
+     * @param Class_ $node
+     */
+    public function refactor(Node $node): ?Class_
+    {
+        if ($this->shouldSkipClass($node)) {
+            return null;
+        }
+
+        $mockObjectPropertyNames = $this->matchMockObjectPropertyNames($node);
+
+        // there are no mock object properties
+        if ($mockObjectPropertyNames === []) {
+            return null;
+        }
+
+        // @todo add the attribute if has more than 1 public test* method
+        $missedTestMethodsByMockPropertyName = [];
+        $testMethodCount = 0;
+
+        foreach ($mockObjectPropertyNames as $mockObjectPropertyName) {
+            $missedTestMethodsByMockPropertyName[$mockObjectPropertyName] = [];
+
+            foreach ($node->getMethods() as $classMethod) {
+                if (! $this->testsNodeAnalyzer->isTestClassMethod($classMethod)) {
+                    continue;
+                }
+
+                // is a mock property used in the class method, as part of some method call? guessing mock expectation is set
+                // skip if so
+                if ($this->isClassMethodUsingMethodCallOnPropertyNamed($classMethod, $mockObjectPropertyName)) {
+                    continue;
+                }
+
+                $missedTestMethodsByMockPropertyName[][] = $this->getName($classMethod);
+                ++$testMethodCount;
+            }
+        }
+
+        if (! $this->shouldAddAttribute($missedTestMethodsByMockPropertyName)) {
+            return null;
+        }
+
+        // add attribute
+        $node->attrGroups[] = new AttributeGroup([
+            new Attribute(new FullyQualified(PHPUnitAttribute::ALLOW_MOCK_OBJECTS_WITHOUT_EXPECTATIONS)),
+        ]);
+
+        return $node;
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition(
+            'Add #[AllowMockObjectsWithoutExpectations] attribute to PHPUnit test classes with mock properties used in multiple methods',
+            [
+                new CodeSample(
+                    <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+final class SomeTest extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someServiceMock;
+
+    protected function setUp(): void
+    {
+        $this->someServiceMock = $this->createMock(SomeService::class);
+    }
+
+    public function testOne(): void
+    {
+        // use $this->someServiceMock
+    }
+
+    public function testTwo(): void
+    {
+        // use $this->someServiceMock
+    }
+}
+CODE_SAMPLE
+                    ,
+                    <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations;
+
+#[AllowMockObjectsWithoutExpectations]
+final class SomeTest extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $someServiceMock;
+
+    protected function setUp(): void
+    {
+        $this->someServiceMock = $this->createMock(SomeService::class);
+    }
+
+    public function testOne(): void
+    {
+        // use $this->someServiceMock
+    }
+
+    public function testTwo(): void
+    {
+        // use $this->someServiceMock
+    }
+}
+CODE_SAMPLE
+                ),
+
+            ]
+        );
+
+    }
+
+    /**
+     * @return string[]
+     */
+    private function matchMockObjectPropertyNames(Class_ $class): array
+    {
+        $propertyNames = [];
+
+        foreach ($class->getProperties() as $property) {
+            if (! $property->type instanceof Name) {
+                continue;
+            }
+
+            if (! $this->isName($property->type, PHPUnitClassName::MOCK_OBJECT)) {
+                continue;
+            }
+
+            $propertyNames[] = $this->getName($property->props[0]);
+        }
+
+        return $propertyNames;
+    }
+
+    private function shouldSkipClass(Class_ $class): bool
+    {
+        if (! $this->testsNodeAnalyzer->isInTestClass($class)) {
+            return true;
+        }
+
+        // attribute must exist for the rule to work
+        if (! $this->reflectionProvider->hasClass(PHPUnitAttribute::ALLOW_MOCK_OBJECTS_WITHOUT_EXPECTATIONS)) {
+            return true;
+        }
+
+        // already filled
+        if ($this->attributeFinder->hasAttributeByClasses(
+            $class,
+            [PHPUnitAttribute::ALLOW_MOCK_OBJECTS_WITHOUT_EXPECTATIONS]
+        )) {
+            return true;
+        }
+
+        // has mock objects properties and setUp() method?
+
+        $setupClassMethod = $class->getMethod(MethodName::SET_UP);
+        return ! $setupClassMethod instanceof ClassMethod;
+    }
+
+    private function isClassMethodUsingMethodCallOnPropertyNamed(ClassMethod $classMethod, string $mockObjectPropertyName): bool
+    {
+        /** @var MethodCall[] $methodCalls */
+        $methodCalls = $this->betterNodeFinder->findInstancesOfScoped([$classMethod], [MethodCall::class]);
+        foreach ($methodCalls as $methodCall) {
+            if (!$methodCall->var instanceof PropertyFetch) {
+                continue;
+            }
+
+            $propertyFetch = $methodCall->var;
+
+            // we found a method call on a property fetch named
+            if ($this->isName($propertyFetch, $mockObjectPropertyName)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function shouldAddAttribute(array $missedTestMethodsByMockPropertyName): bool
+    {
+        foreach ($missedTestMethodsByMockPropertyName as $missedTestMethods) {
+            // all test methods are using method calls on the mock property, so skip
+            if (count($missedTestMethods) === 0) {
+                continue;
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/src/Enum/PHPUnitAttribute.php b/src/Enum/PHPUnitAttribute.php
index bf09c0fa..a540f7f6 100644
--- a/src/Enum/PHPUnitAttribute.php
+++ b/src/Enum/PHPUnitAttribute.php
@@ -23,4 +23,9 @@ final class PHPUnitAttribute
     public const string REQUIRES_SETTING = 'PHPUnit\Framework\Attributes\RequiresSetting';
 
     public const string TEST = 'PHPUnit\Framework\Attributes\Test';
+
+    /**
+     * @see https://github.com/sebastianbergmann/phpunit/commit/24c208d6a340c3071f28a9b5cce02b9377adfd43
+     */
+    public const string ALLOW_MOCK_OBJECTS_WITHOUT_EXPECTATIONS = 'PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations';
 }
diff --git a/src/Enum/PHPUnitClassName.php b/src/Enum/PHPUnitClassName.php
index 51a4ee21..5171edfa 100644
--- a/src/Enum/PHPUnitClassName.php
+++ b/src/Enum/PHPUnitClassName.php
@@ -23,6 +23,8 @@ final class PHPUnitClassName
 
     public const string TEST_LISTENER = 'PHPUnit\Framework\TestListener';
 
+    public const string MOCK_OBJECT = 'PHPUnit\Framework\MockObject\MockObject';
+
     /**
      * @var string[]
      */