diff --git a/tests/framework/mutex/DbMutexTest.php b/tests/framework/mutex/DbMutexTest.php
new file mode 100644
index 00000000000..3392c9ac549
--- /dev/null
+++ b/tests/framework/mutex/DbMutexTest.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+declare(strict_types=1);
+
+namespace yiiunit\framework\mutex;
+
+use Yii;
+use yii\base\InvalidConfigException;
+use yii\db\Connection;
+use yiiunit\TestCase;
+
+/**
+ * @group mutex
+ * @group db
+ */
+class DbMutexTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->mockApplication([
+            'components' => [
+                'db' => [
+                    'class' => Connection::class,
+                    'dsn' => 'sqlite::memory:',
+                ],
+            ],
+        ]);
+    }
+
+    public function testDbPropertyDefaultValue(): void
+    {
+        $mutex = $this->getMockForAbstractClass('yii\mutex\DbMutex');
+        $this->assertInstanceOf(Connection::class, $mutex->db);
+    }
+
+    public function testDbPropertyResolvesFromApplicationComponent(): void
+    {
+        $mutex = $this->getMockForAbstractClass('yii\mutex\DbMutex');
+        $this->assertSame(Yii::$app->db, $mutex->db);
+    }
+
+    public function testDbPropertyAcceptsConnectionObject(): void
+    {
+        $connection = new Connection(['dsn' => 'sqlite::memory:']);
+        $mutex = $this->getMockForAbstractClass('yii\mutex\DbMutex', [['db' => $connection]]);
+        $this->assertSame($connection, $mutex->db);
+    }
+
+    public function testDbPropertyAcceptsConfigArray(): void
+    {
+        $mutex = $this->getMockForAbstractClass('yii\mutex\DbMutex', [[
+            'db' => [
+                'class' => Connection::class,
+                'dsn' => 'sqlite::memory:',
+            ],
+        ]]);
+        $this->assertInstanceOf(Connection::class, $mutex->db);
+    }
+
+    public function testThrowsExceptionForInvalidDb(): void
+    {
+        $this->expectException(InvalidConfigException::class);
+        $this->getMockForAbstractClass('yii\mutex\DbMutex', [['db' => 'nonExistingComponent']]);
+    }
+}
diff --git a/tests/framework/mutex/MutexTest.php b/tests/framework/mutex/MutexTest.php
new file mode 100644
index 00000000000..16d7dd2ef79
--- /dev/null
+++ b/tests/framework/mutex/MutexTest.php
@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+declare(strict_types=1);
+
+namespace yiiunit\framework\mutex;
+
+use yiiunit\framework\mutex\mocks\DumbMutex;
+use yiiunit\TestCase;
+
+/**
+ * @group mutex
+ */
+class MutexTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        DumbMutex::$locked = false;
+    }
+
+    public function testAcquireAndRelease(): void
+    {
+        $mutex = new DumbMutex();
+        $this->assertTrue($mutex->acquire('test'));
+        $this->assertTrue($mutex->isAcquired('test'));
+        $this->assertTrue($mutex->release('test'));
+        $this->assertFalse($mutex->isAcquired('test'));
+    }
+
+    public function testAcquireSameLockTwiceReturnsFalse(): void
+    {
+        $mutex = new DumbMutex();
+        $this->assertTrue($mutex->acquire('test'));
+        $this->assertFalse($mutex->acquire('test'));
+        $mutex->release('test');
+    }
+
+    public function testReleaseUnacquiredLockReturnsFalse(): void
+    {
+        $mutex = new DumbMutex();
+        $this->assertFalse($mutex->release('test'));
+    }
+
+    public function testIsAcquiredReturnsFalseForUnknownLock(): void
+    {
+        $mutex = new DumbMutex();
+        $this->assertFalse($mutex->isAcquired('nonexistent'));
+    }
+
+    public function testAutoReleaseIsEnabledByDefault(): void
+    {
+        $mutex = new DumbMutex();
+        $this->assertTrue($mutex->autoRelease);
+    }
+
+    public function testAutoReleaseCanBeDisabled(): void
+    {
+        $mutex = new DumbMutex(['autoRelease' => false]);
+        $this->assertFalse($mutex->autoRelease);
+    }
+
+    public function testAcquireSkipsAcquireLockWhenAlreadyHeld(): void
+    {
+        $mutex = new DumbMutex();
+        $mutex->acquire('test');
+
+        $countBefore = count($mutex->attemptsTime);
+        $mutex->acquire('test');
+        $this->assertCount($countBefore, $mutex->attemptsTime);
+
+        $mutex->release('test');
+    }
+}
diff --git a/tests/framework/mutex/OracleMutexTest.php b/tests/framework/mutex/OracleMutexTest.php
new file mode 100644
index 00000000000..01a6ca34cc3
--- /dev/null
+++ b/tests/framework/mutex/OracleMutexTest.php
@@ -0,0 +1,115 @@
+<?php
+
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+declare(strict_types=1);
+
+namespace yiiunit\framework\mutex;
+
+use yii\base\InvalidConfigException;
+use yii\db\Connection;
+use yii\mutex\OracleMutex;
+use yiiunit\TestCase;
+
+/**
+ * @group mutex
+ */
+class OracleMutexTest extends TestCase
+{
+    public function testInitSucceedsWithOciDriver(): void
+    {
+        $db = $this->createMock(Connection::class);
+        $db->method('__get')->willReturnMap([
+            ['driverName', 'oci'],
+        ]);
+
+        $this->mockApplication([
+            'components' => [
+                'db' => $db,
+            ],
+        ]);
+
+        $mutex = new OracleMutex(['db' => $db]);
+        $this->assertSame($db, $mutex->db);
+    }
+
+    public function testInitSucceedsWithOdbcDriver(): void
+    {
+        $db = $this->createMock(Connection::class);
+        $db->method('__get')->willReturnMap([
+            ['driverName', 'odbc'],
+        ]);
+
+        $this->mockApplication([
+            'components' => [
+                'db' => $db,
+            ],
+        ]);
+
+        $mutex = new OracleMutex(['db' => $db]);
+        $this->assertSame($db, $mutex->db);
+    }
+
+    public function testDefaultProperties(): void
+    {
+        $db = $this->createMock(Connection::class);
+        $db->method('__get')->willReturnMap([
+            ['driverName', 'oci'],
+        ]);
+
+        $this->mockApplication();
+
+        $mutex = new OracleMutex(['db' => $db]);
+        $this->assertSame(OracleMutex::MODE_X, $mutex->lockMode);
+        $this->assertFalse($mutex->releaseOnCommit);
+    }
+
+    public function testCustomProperties(): void
+    {
+        $db = $this->createMock(Connection::class);
+        $db->method('__get')->willReturnMap([
+            ['driverName', 'oci'],
+        ]);
+
+        $this->mockApplication();
+
+        $mutex = new OracleMutex([
+            'db' => $db,
+            'lockMode' => OracleMutex::MODE_NL,
+            'releaseOnCommit' => true,
+        ]);
+        $this->assertSame(OracleMutex::MODE_NL, $mutex->lockMode);
+        $this->assertTrue($mutex->releaseOnCommit);
+    }
+
+    /**
+     * @dataProvider invalidDriverProvider
+     */
+    public function testThrowsExceptionForInvalidDrivers(string $driverName): void
+    {
+        $db = $this->createMock(Connection::class);
+        $db->method('__get')->willReturnMap([
+            ['driverName', $driverName],
+        ]);
+
+        $this->mockApplication();
+
+        $this->expectException(InvalidConfigException::class);
+        $this->expectExceptionMessage('In order to use OracleMutex connection must be configured to use Oracle database.');
+        new OracleMutex(['db' => $db]);
+    }
+
+    public static function invalidDriverProvider(): array
+    {
+        return [
+            'mysql' => ['mysql'],
+            'pgsql' => ['pgsql'],
+            'sqlite' => ['sqlite'],
+            'sqlsrv' => ['sqlsrv'],
+        ];
+    }
+}