diff --git a/psalm.xml.dist b/psalm.xml.dist
index 0c6003c..7bc8183 100644
--- a/psalm.xml.dist
+++ b/psalm.xml.dist
@@ -76,7 +76,7 @@
 
     <stubs>
         <file name="tests/unit/Fixtures/classes.php" preloadClasses="true"/>
-        <file name="tests/unit/Fixtures/readonly_classes.php" preloadClasses="true"/>
+        <file name="tests/unit/Fixtures/classes_php82.php" preloadClasses="true"/>
         <file name="stubs/PhpParser/Node/Expr/Variable.phpstub"/>
         <file name="stubs/PhpParser/Node/Identifier.phpstub"/>
         <file name="stubs/PhpParser/Node/IntersectionType.phpstub"/>
diff --git a/tests/unit/Fixtures/classes.php b/tests/unit/Fixtures/classes.php
index 5ca297d..f121bcb 100644
--- a/tests/unit/Fixtures/classes.php
+++ b/tests/unit/Fixtures/classes.php
@@ -18,9 +18,21 @@ class JustClass {}
 
     enum JustEnum {}
 
-    enum IntEnum: int {}
+    enum EmptyIntEnum: int {}
 
-    enum StringEnum: string {}
+    enum IntEnum: int
+    {
+        case ONE = 1;
+        case TWO = 2;
+    }
+
+    enum EmptyStringEnum: string {}
+
+    enum StringEnum: string
+    {
+        case A = 'a';
+        case B = 'b';
+    }
 
     interface JustInterface {}
 
@@ -467,3 +479,15 @@ public function publicMethod(): void {}
         private function t2PublicAsPrivate(): void {}
     }
 }
+
+namespace Constants
+{
+    class ClassWithConstants
+    {
+        const CONSTANT_WITHOUT_VISIBILITY = null;
+        public const PUBLIC_CONSTANT = 1;
+        protected const PROTECTED_CONSTANT = 'protected';
+        protected const PRIVATE_CONSTANT = 0.34;
+        final protected const FINAL_CONSTANT = true;
+    }
+}
diff --git a/tests/unit/Fixtures/readonly_classes.php b/tests/unit/Fixtures/classes_php82.php
similarity index 87%
rename from tests/unit/Fixtures/readonly_classes.php
rename to tests/unit/Fixtures/classes_php82.php
index 1d53663..986f93e 100644
--- a/tests/unit/Fixtures/readonly_classes.php
+++ b/tests/unit/Fixtures/classes_php82.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace ReadonlyClasses;
+namespace Classes\PHP82;
 
 readonly class ReadonlyClass {}
 
diff --git a/tests/unit/FixturesProvider.php b/tests/unit/FixturesProvider.php
index a6d54fe..241db5e 100644
--- a/tests/unit/FixturesProvider.php
+++ b/tests/unit/FixturesProvider.php
@@ -30,10 +30,10 @@ public static function classes(): array
             ...self::loadFromFile(__DIR__ . '/Fixtures/classes.php'),
         ];
 
-        if (PHP_VERSION >= 80200) {
+        if (\PHP_VERSION_ID >= 80200) {
             self::$classes = [
                 ...self::$classes,
-                ...self::loadFromFile(__DIR__ . '/Fixtures/readonly_classes.php'),
+                ...self::loadFromFile(__DIR__ . '/Fixtures/classes_php82.php'),
             ];
         }
 
diff --git a/tests/unit/ReflectorCompatibilityTest.php b/tests/unit/ReflectorCompatibilityTest.php
index ef41347..760a34d 100644
--- a/tests/unit/ReflectorCompatibilityTest.php
+++ b/tests/unit/ReflectorCompatibilityTest.php
@@ -341,6 +341,10 @@ private function assertSameNames(array $nativeReflections, array $typhoonReflect
 
     private function canCreateMockObject(\ReflectionClass $class): bool
     {
+        if (method_exists($class, 'isReadonly') && $class->isReadonly()) {
+            return false;
+        }
+
         if ($class->isTrait()) {
             return false;
         }