diff --git a/src/test/php/unittest/assert/unittest/AssertTest.class.php b/src/test/php/unittest/assert/unittest/AssertTest.class.php
index d6244e9..aaf50ec 100755
--- a/src/test/php/unittest/assert/unittest/AssertTest.class.php
+++ b/src/test/php/unittest/assert/unittest/AssertTest.class.php
@@ -50,9 +50,9 @@ public function execute_all_assertions() {
   public function even_inside_allof_execution_stops_at_first_failure() {
     try {
       All::of(function() {
-        Assert::that('Hello')->isEmpty()->is(newinstance(Condition::class, [], [
-          'matches' => function($value) { throw new IllegalStateException('Unreachable'); }
-        ]));
+        Assert::that('Hello')->isEmpty()->is(new class() extends Condition {
+          public function matches($value) { throw new IllegalStateException('Unreachable'); }
+        });
       });
     } catch (AssertionFailedError $expected) {
       return;
diff --git a/src/test/php/unittest/assert/unittest/ConditionAssertionsTest.class.php b/src/test/php/unittest/assert/unittest/ConditionAssertionsTest.class.php
index 38bf1f8..2543280 100755
--- a/src/test/php/unittest/assert/unittest/ConditionAssertionsTest.class.php
+++ b/src/test/php/unittest/assert/unittest/ConditionAssertionsTest.class.php
@@ -9,15 +9,15 @@ class ConditionAssertionsTest extends AbstractAssertionsTest {
 
   #[@test]
   public function is_a_test() {
-    $this->assertVerified(Assertions::of('Test')->is(newinstance(Condition::class, [], [
-      'matches' => function($value) { return 'Test' === $value; }
-    ])));
+    $this->assertVerified(Assertions::of('Test')->is(new class() extends Condition {
+      public function matches($value) { return 'Test' === $value; }
+    }));
   }
 
   #[@test]
   public function is_not_a_test() {
-    $this->assertVerified(Assertions::of('Test')->isNot(newinstance(Condition::class, [], [
-      'matches' => function($value) { return 'Test' !== $value; }
-    ])));
+    $this->assertVerified(Assertions::of('Test')->isNot(new class() extends Condition {
+      public function matches($value) { return 'Test' !== $value; }
+    }));
   }
 }
\ No newline at end of file
diff --git a/src/test/php/unittest/assert/unittest/ExtractingTest.class.php b/src/test/php/unittest/assert/unittest/ExtractingTest.class.php
index 519efa6..f6e44e4 100755
--- a/src/test/php/unittest/assert/unittest/ExtractingTest.class.php
+++ b/src/test/php/unittest/assert/unittest/ExtractingTest.class.php
@@ -11,24 +11,24 @@ class ExtractingTest extends AbstractAssertionsTest {
   protected function people() {
     return [
       [['id' => 1, 'name' => 'Test', 'age' => 42, 'department' => ['name' => 'Test']]],
-      [newinstance(Name::class, ['Test'], [
-        'id'            => 1,
-        'name'          => 'Test',
-        'age'           => 42,
-        'department'    => ['name' => 'Test']
-      ])],
-      [newinstance(Name::class, ['Test'], [
-        'id'            => function() { return 1; },
-        'name'          => function() { return 'Test'; },
-        'age'           => function() { return 42; },
-        'department'    => function() { return ['name' => 'Test']; }
-      ])],
-      [newinstance(Name::class, ['Test'], [
-        'getId'         => function() { return 1; },
-        'getName'       => function() { return 'Test'; },
-        'getAge'        => function() { return 42; },
-        'getDepartment' => function() { return ['name' => 'Test']; }
-      ])],
+      [new class('Test') extends Name {
+        public $id= 1;
+        public $name= 'Test';
+        public $age= 42;
+        public $department= ['name' => 'Test'];
+      }],
+      [new class('Test') extends Name {
+        public function id() { return 1; }
+        public function name() { return 'Test'; }
+        public function age() { return 42; }
+        public function department() { return ['name' => 'Test']; }
+      }],
+      [new class('Test') extends Name {
+        public function getId() { return 1; }
+        public function getName() { return 'Test'; }
+        public function getAge() { return 42; }
+        public function getDepartment() { return ['name' => 'Test']; }
+      }],
       [new Person(1, 'Test', 42, ['name' => 'Test'])]
     ];
   }