diff --git a/src/Testing/Assert/Expectation.php b/src/Testing/Assert/Expectation.php
index b14f873..6276928 100644
--- a/src/Testing/Assert/Expectation.php
+++ b/src/Testing/Assert/Expectation.php
@@ -14,7 +14,7 @@
 
 namespace Playwright\Testing\Assert;
 
-use PHPUnit\Framework\AssertionFailedError;
+use Playwright\Assertions\Failure\AssertionException;
 use Playwright\Locator\LocatorInterface;
 use Playwright\Page\PageInterface;
 
@@ -48,7 +48,7 @@ public function not(): self
     public function toBeVisible(?LocatorOptions $o = null): void
     {
         if (!$this->subject instanceof LocatorInterface) {
-            throw new AssertionFailedError('Subject is not a Locator');
+            throw new AssertionException('Subject is not a Locator');
         }
         $timeout = $this->timeoutMs;
         if (!is_int($timeout)) {
@@ -71,13 +71,13 @@ public function toBeVisible(?LocatorOptions $o = null): void
         } while (\microtime(true) < $deadline);
 
         $msg = $this->negated ? 'not to be visible' : 'to be visible';
-        throw new AssertionFailedError("Expected locator {$msg}, last state: {$last}");
+        throw new AssertionException("Expected locator {$msg}, last state: {$last}");
     }
 
     public function toHaveURL(string|\Stringable|Regex $url, ?PageOptions $o = null): void
     {
         if (!$this->subject instanceof PageInterface) {
-            throw new AssertionFailedError('Subject is not a Page');
+            throw new AssertionException('Subject is not a Page');
         }
         $timeout = $this->timeoutMs;
         if (!is_int($timeout)) {
@@ -114,6 +114,6 @@ public function toHaveURL(string|\Stringable|Regex $url, ?PageOptions $o = null)
         } while (\microtime(true) < $deadline);
 
         $expectText = $this->negated ? 'not to match' : 'to match';
-        throw new AssertionFailedError("Expected page URL {$expectText} {$pattern}, last observed: {$last}");
+        throw new AssertionException("Expected page URL {$expectText} {$pattern}, last observed: {$last}");
     }
 }
diff --git a/src/Testing/Expect.php b/src/Testing/Expect.php
index f594835..9a17118 100644
--- a/src/Testing/Expect.php
+++ b/src/Testing/Expect.php
@@ -14,8 +14,7 @@
 
 namespace Playwright\Testing;
 
-use PHPUnit\Framework\Assert;
-use PHPUnit\Framework\AssertionFailedError;
+use Playwright\Assertions\Failure\AssertionException;
 use Playwright\Locator\LocatorInterface;
 use Playwright\Page\PageInterface;
 
@@ -383,12 +382,10 @@ private function retryAssertion(callable $condition, bool $expectedResult, strin
                 $actualResult = $condition();
 
                 if ($actualResult === $expectedResult) {
-                    Assert::assertEquals($expectedResult, $actualResult);
-
                     return;
                 }
 
-                $lastException = new AssertionFailedError($message);
+                $lastException = new AssertionException($message);
             } catch (\Throwable $e) {
                 $lastException = $e;
             }
@@ -407,15 +404,15 @@ private function retryAssertion(callable $condition, bool $expectedResult, strin
             }
         }
 
-        if ($lastException instanceof AssertionFailedError) {
+        if ($lastException instanceof AssertionException) {
             throw $lastException;
         }
 
         if ($lastException) {
-            throw new AssertionFailedError(\sprintf('Assertion timed out after %dms: %s. Last error: %s', $this->timeoutMs, $finalMessage, $lastException->getMessage()), 0, $lastException);
+            throw new AssertionException(\sprintf('Assertion timed out after %dms: %s. Last error: %s', $this->timeoutMs, $finalMessage, $lastException->getMessage()));
         }
 
-        throw new AssertionFailedError(\sprintf('Assertion timed out after %dms: %s', $this->timeoutMs, $finalMessage));
+        throw new AssertionException(\sprintf('Assertion timed out after %dms: %s', $this->timeoutMs, $finalMessage));
     }
 
     public function toHaveCSS(string $name, string $value): void
diff --git a/src/Testing/ExpectDecorator.php b/src/Testing/ExpectDecorator.php
new file mode 100644
index 0000000..87789a8
--- /dev/null
+++ b/src/Testing/ExpectDecorator.php
@@ -0,0 +1,178 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the community-maintained Playwright PHP project.
+ * It is not affiliated with or endorsed by Microsoft.
+ *
+ * (c) 2025-Present - Playwright PHP - https://github.com/playwright-php
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Playwright\Testing;
+
+/**
+ * Decorator for Expect that automatically increments PHPUnit assertion count when available.
+ * This allows the Expect class to work independently (without PHPUnit) while still
+ * counting assertions properly when used within PHPUnit tests.
+ */
+final class ExpectDecorator implements ExpectInterface
+{
+    private int $assertionCount = 0;
+
+    public function __construct(
+        private readonly ExpectInterface $expect,
+        private readonly ?object $testCase = null,
+    ) {
+    }
+
+    public function toBeVisible(): void
+    {
+        $this->expect->toBeVisible();
+        $this->recordAssertion(1);
+    }
+
+    public function toBeHidden(): void
+    {
+        $this->expect->toBeHidden();
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveText(string $text): void
+    {
+        $this->expect->toHaveText($text);
+        $this->recordAssertion(1);
+    }
+
+    public function toContainText(string $text): void
+    {
+        $this->expect->toContainText($text);
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveExactText(string $text): void
+    {
+        $this->expect->toHaveExactText($text);
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveValue(string $value): void
+    {
+        $this->expect->toHaveValue($value);
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveAttribute(string $name, string $value): void
+    {
+        $this->expect->toHaveAttribute($name, $value);
+        $this->recordAssertion(1);
+    }
+
+    public function toBeChecked(): void
+    {
+        $this->expect->toBeChecked();
+        $this->recordAssertion(1);
+    }
+
+    public function toBeEnabled(): void
+    {
+        $this->expect->toBeEnabled();
+        $this->recordAssertion(1);
+    }
+
+    public function toBeDisabled(): void
+    {
+        $this->expect->toBeDisabled();
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveCSS(string $name, string $value): void
+    {
+        $this->expect->toHaveCSS($name, $value);
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveId(string $id): void
+    {
+        $this->expect->toHaveId($id);
+        $this->recordAssertion(1);
+    }
+
+    /**
+     * @param string|string[] $class
+     */
+    public function toHaveClass(string|array $class): void
+    {
+        $this->expect->toHaveClass($class);
+        $this->recordAssertion(1);
+    }
+
+    public function toBeEmpty(): void
+    {
+        $this->expect->toBeEmpty();
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveCount(int $count): void
+    {
+        $this->expect->toHaveCount($count);
+        $this->recordAssertion(1);
+    }
+
+    public function toBeFocused(): void
+    {
+        $this->expect->toBeFocused();
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveFocus(): void
+    {
+        $this->expect->toHaveFocus();
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveTitle(string $title): void
+    {
+        $this->expect->toHaveTitle($title);
+        $this->recordAssertion(1);
+    }
+
+    public function toHaveURL(string $url): void
+    {
+        $this->expect->toHaveURL($url);
+        $this->recordAssertion(1);
+    }
+
+    public function not(): self
+    {
+        $this->expect->not();
+
+        return $this;
+    }
+
+    public function withTimeout(int $timeoutMs): self
+    {
+        $this->expect->withTimeout($timeoutMs);
+
+        return $this;
+    }
+
+    public function withPollInterval(int $pollIntervalMs): self
+    {
+        $this->expect->withPollInterval($pollIntervalMs);
+
+        return $this;
+    }
+
+    private function recordAssertion(int $count): void
+    {
+        $this->assertionCount += $count;
+
+        if (null !== $this->testCase && method_exists($this->testCase, 'addToAssertionCount')) {
+            $this->testCase->addToAssertionCount($count);
+        }
+    }
+}
diff --git a/src/Testing/PlaywrightTestCaseTrait.php b/src/Testing/PlaywrightTestCaseTrait.php
index a39e06f..37cf21e 100644
--- a/src/Testing/PlaywrightTestCaseTrait.php
+++ b/src/Testing/PlaywrightTestCaseTrait.php
@@ -118,7 +118,7 @@ protected function assertElementExists(string $selector): void
 
     protected function expect(LocatorInterface|PageInterface $subject): ExpectInterface
     {
-        return new Expect($subject);
+        return new ExpectDecorator(new Expect($subject), $this);
     }
 
     private function resolveLogger(?LoggerInterface $logger): ?LoggerInterface
diff --git a/tests/Integration/Testing/ExpectTest.php b/tests/Integration/Testing/ExpectTest.php
index 3e172c0..c6a3ed1 100644
--- a/tests/Integration/Testing/ExpectTest.php
+++ b/tests/Integration/Testing/ExpectTest.php
@@ -69,8 +69,6 @@ public function itAssertsVisibility(): void
 
         $expect = $this->expect($this->page->locator('#div-2'));
         $expect->toBeHidden();
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -81,8 +79,6 @@ public function itAssertsTextContent(): void
 
         $expect = $this->expect($this->page->locator('h1'));
         $expect->not()->toHaveText('Wrong Text');
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -105,8 +101,6 @@ public function itAssertsInputValue(): void
 
         $expect = $this->expect($this->page->locator('#input-text'));
         $expect->not()->toHaveValue('wrong value');
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -117,8 +111,6 @@ public function itAssertsAttributeValue(): void
 
         $expect = $this->expect($this->page->locator('#input-text'));
         $expect->not()->toHaveAttribute('type', 'password');
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -131,8 +123,6 @@ public function itAssertsCheckedState(): void
 
         $expect = $this->expect($this->page->locator('#input-checkbox'));
         $expect->not()->toBeChecked();
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -146,8 +136,6 @@ public function itAssertsEnabledState(): void
 
         $expect = $this->expect($this->page->locator('#button-2'));
         $expect->toBeDisabled();
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]
@@ -158,8 +146,6 @@ public function itAssertsElementCount(): void
 
         $expect = $this->expect($this->page->locator('button'));
         $expect->not()->toHaveCount(1);
-
-        $this->addToAssertionCount(2);
     }
 
     #[Test]