diff --git a/Tests/Caster/DoctrineCasterTest.php b/Tests/Caster/DoctrineCasterTest.php
new file mode 100644
index 00000000..85f6293b
--- /dev/null
+++ b/Tests/Caster/DoctrineCasterTest.php
@@ -0,0 +1,45 @@
+<?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\Component\VarDumper\Tests\Caster;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Mapping\ClassMetadata;
+use Doctrine\ORM\PersistentCollection;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\VarDumper\Test\VarDumperTestTrait;
+
+/**
+ * @requires function \Doctrine\Common\Collections\ArrayCollection::__construct
+ */
+class DoctrineCasterTest extends TestCase
+{
+    use VarDumperTestTrait;
+
+    public function testCastPersistentCollection()
+    {
+        $classMetadata = new ClassMetadata(__CLASS__);
+
+        $collection = new PersistentCollection($this->createMock(EntityManagerInterface::class), $classMetadata, new ArrayCollection(['test']));
+
+        $expected = <<<EODUMP
+Doctrine\ORM\PersistentCollection {
+%A
+  -em: Mock_EntityManagerInterface_%s { …3}
+  -backRefFieldName: null
+  -typeClass: Doctrine\ORM\Mapping\ClassMetadata { …}
+%A
+EODUMP;
+
+        $this->assertDumpMatchesFormat($expected, $collection);
+    }
+}
diff --git a/Tests/Caster/ExceptionCasterTest.php b/Tests/Caster/ExceptionCasterTest.php
index 73545701..2609eb7f 100644
--- a/Tests/Caster/ExceptionCasterTest.php
+++ b/Tests/Caster/ExceptionCasterTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\VarDumper\Tests\Caster;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\ErrorHandler\Exception\SilencedErrorContext;
 use Symfony\Component\VarDumper\Caster\Caster;
 use Symfony\Component\VarDumper\Caster\ExceptionCaster;
 use Symfony\Component\VarDumper\Caster\FrameStub;
@@ -29,6 +30,21 @@ private function getTestException($msg, &$ref = null)
         return new \Exception(''.$msg);
     }
 
+    private function getTestError($msg): \Error
+    {
+        return new \Error(''.$msg);
+    }
+
+    private function getTestErrorException($msg): \ErrorException
+    {
+        return new \ErrorException(''.$msg);
+    }
+
+    private function getTestSilencedErrorContext(): SilencedErrorContext
+    {
+        return new SilencedErrorContext(\E_ERROR, __FILE__, __LINE__);
+    }
+
     protected function tearDown(): void
     {
         ExceptionCaster::$srcContext = 1;
@@ -61,6 +77,79 @@ public function testDefaultSettings()
         $this->assertSame(['foo'], $ref);
     }
 
+    public function testDefaultSettingsOnError()
+    {
+        $e = $this->getTestError('foo');
+
+        $expectedDump = <<<'EODUMP'
+Error {
+  #message: "foo"
+  #code: 0
+  #file: "%sExceptionCasterTest.php"
+  #line: %d
+  trace: {
+    %s%eTests%eCaster%eExceptionCasterTest.php:%d {
+      Symfony\Component\VarDumper\Tests\Caster\ExceptionCasterTest->getTestError($msg): Error
+      › {
+      ›     return new \Error(''.$msg);
+      › }
+    }
+    %s%eTests%eCaster%eExceptionCasterTest.php:%d { …}
+%A
+EODUMP;
+
+        $this->assertDumpMatchesFormat($expectedDump, $e);
+    }
+
+    public function testDefaultSettingsOnErrorException()
+    {
+        $e = $this->getTestErrorException('foo');
+
+        $expectedDump = <<<'EODUMP'
+ErrorException {
+  #message: "foo"
+  #code: 0
+  #file: "%sExceptionCasterTest.php"
+  #line: %d
+  #severity: E_ERROR
+  trace: {
+    %s%eTests%eCaster%eExceptionCasterTest.php:%d {
+      Symfony\Component\VarDumper\Tests\Caster\ExceptionCasterTest->getTestErrorException($msg): ErrorException
+      › {
+      ›     return new \ErrorException(''.$msg);
+      › }
+    }
+    %s%eTests%eCaster%eExceptionCasterTest.php:%d { …}
+%A
+EODUMP;
+
+        $this->assertDumpMatchesFormat($expectedDump, $e);
+    }
+
+    /**
+     * @requires function \Symfony\Component\ErrorHandler\Exception\SilencedErrorContext::__construct
+     */
+    public function testCastSilencedErrorContext()
+    {
+        $e = $this->getTestSilencedErrorContext();
+
+        $expectedDump = <<<'EODUMP'
+Symfony\Component\ErrorHandler\Exception\SilencedErrorContext {
+  +count: 1
+  -severity: E_ERROR
+  trace: {
+    %s%eTests%eCaster%eExceptionCasterTest.php:%d {
+      › {
+      ›     return new SilencedErrorContext(\E_ERROR, __FILE__, __LINE__);
+      › }
+    }
+  }
+}
+EODUMP;
+
+        $this->assertDumpMatchesFormat($expectedDump, $e);
+    }
+
     public function testSeek()
     {
         $e = $this->getTestException(2);
diff --git a/Tests/Caster/FiberCasterTest.php b/Tests/Caster/FiberCasterTest.php
new file mode 100644
index 00000000..41ba099d
--- /dev/null
+++ b/Tests/Caster/FiberCasterTest.php
@@ -0,0 +1,76 @@
+<?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\Component\VarDumper\Tests\Caster;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\VarDumper\Test\VarDumperTestTrait;
+
+class FiberCasterTest extends TestCase
+{
+    use VarDumperTestTrait;
+
+    public function testCastFiberNotStarted()
+    {
+        $fiber = new \Fiber(static fn() => true);
+
+        $expected = <<<EODUMP
+Fiber {
+  status: "not started"
+}
+EODUMP;
+
+        $this->assertDumpEquals($expected, $fiber);
+    }
+
+    public function testCastFiberTerminated()
+    {
+        $fiber = new \Fiber(static fn () => true);
+        $fiber->start();
+
+        $expected = <<<EODUMP
+Fiber {
+  status: "terminated"
+}
+EODUMP;
+
+        $this->assertDumpEquals($expected, $fiber);
+    }
+
+    public function testCastFiberSuspended()
+    {
+        $fiber = new \Fiber(\Fiber::suspend(...));
+        $fiber->start();
+
+        $expected = <<<EODUMP
+Fiber {
+  status: "suspended"
+}
+EODUMP;
+
+        $this->assertDumpEquals($expected, $fiber);
+    }
+
+    public function testCastFiberRunning()
+    {
+        $fiber = new \Fiber(function () {
+            $expected = <<<EODUMP
+Fiber {
+  status: "running"
+}
+EODUMP;
+
+            $this->assertDumpEquals($expected, \Fiber::getCurrent());
+        });
+
+        $fiber->start();
+    }
+}
diff --git a/Tests/Dumper/ContextProvider/RequestContextProviderTest.php b/Tests/Dumper/ContextProvider/RequestContextProviderTest.php
new file mode 100644
index 00000000..5c141595
--- /dev/null
+++ b/Tests/Dumper/ContextProvider/RequestContextProviderTest.php
@@ -0,0 +1,49 @@
+<?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 Dumper\ContextProvider;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\VarDumper\Cloner\Data;
+use Symfony\Component\VarDumper\Dumper\ContextProvider\RequestContextProvider;
+
+/**
+ * @requires function \Symfony\Component\HttpFoundation\RequestStack::__construct
+ */
+class RequestContextProviderTest extends TestCase
+{
+    public function testGetContextOnNullRequest()
+    {
+        $requestStack = new RequestStack();
+        $provider = new RequestContextProvider($requestStack);
+
+        $this->assertNull($provider->getContext());
+    }
+
+    public function testGetContextOnRequest()
+    {
+        $request = Request::create('https://example.org/', 'POST');
+        $request->attributes->set('_controller', 'MyControllerClass');
+
+        $requestStack = new RequestStack();
+        $requestStack->push($request);
+
+        $context = (new RequestContextProvider($requestStack))->getContext();
+        $this->assertSame('https://example.org/', $context['uri']);
+        $this->assertSame('POST', $context['method']);
+        $this->assertInstanceOf(Data::class, $context['controller']);
+        $this->assertSame('MyControllerClass', $context['controller']->getValue());
+        $this->assertSame('https://example.org/', $context['uri']);
+        $this->assertArrayHasKey('identifier', $context);
+    }
+}