diff --git a/tests/unit/Providers/ServerVariables/ServerVariablesProviderTest.php b/tests/unit/Providers/ServerVariables/ServerVariablesProviderTest.php
new file mode 100644
index 0000000000..bf806b86ee
--- /dev/null
+++ b/tests/unit/Providers/ServerVariables/ServerVariablesProviderTest.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpMyAdmin\Tests\Providers\ServerVariables;
+
+use PhpMyAdmin\Providers\ServerVariables\ServerVariablesProvider;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+use ReflectionProperty;
+
+#[CoversClass(ServerVariablesProvider::class)]
+final class ServerVariablesProviderTest extends TestCase
+{
+    public function testUniqueness(): void
+    {
+        (new ReflectionProperty(ServerVariablesProvider::class, 'instance'))->setValue(null, null);
+        $instanceOne = ServerVariablesProvider::getImplementation();
+        $instanceTwo = ServerVariablesProvider::getImplementation();
+        self::assertSame($instanceOne, $instanceTwo);
+    }
+}
diff --git a/tests/unit/Providers/ServerVariables/VoidProviderTest.php b/tests/unit/Providers/ServerVariables/VoidProviderTest.php
new file mode 100644
index 0000000000..715f1f7b6d
--- /dev/null
+++ b/tests/unit/Providers/ServerVariables/VoidProviderTest.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpMyAdmin\Tests\Providers\ServerVariables;
+
+use PhpMyAdmin\Providers\ServerVariables\VoidProvider;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(VoidProvider::class)]
+final class VoidProviderTest extends TestCase
+{
+    public function testVoidProvider(): void
+    {
+        $provider = new VoidProvider();
+        self::assertNull($provider->getVariableType('test'));
+        self::assertSame([], $provider->getStaticVariables());
+        self::assertNull($provider->getDocLinkByNameMariaDb('test'));
+        self::assertNull($provider->getDocLinkByNameMysql('test'));
+    }
+}