diff --git a/tests/lib/Mock/Config/MockAppConfig.php b/tests/lib/Mock/Config/MockAppConfig.php
new file mode 100644
index 00000000000..f601bf6dbc5
--- /dev/null
+++ b/tests/lib/Mock/Config/MockAppConfig.php
@@ -0,0 +1,169 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\Mock\Config;
+
+use OCP\Exceptions\AppConfigIncorrectTypeException;
+use OCP\IAppConfig;
+
+class MockAppConfig implements IAppConfig {
+	public function __construct(
+		public array $config = [],
+	) {
+	}
+
+	public function hasKey(string $app, string $key, ?bool $lazy = false): bool {
+		return isset($this->config[$app][$key]);
+	}
+
+	public function getValues($app, $key): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function getFilteredValues($app): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function getApps(): array {
+		return array_keys($this->config);
+	}
+
+	public function getKeys(string $app): array {
+		return array_keys($this->config[$app] ?? []);
+	}
+
+	public function isSensitive(string $app, string $key, ?bool $lazy = false): bool {
+		throw new \Exception('not implemented');
+	}
+
+	public function isLazy(string $app, string $key): bool {
+		throw new \Exception('not implemented');
+	}
+
+	public function getAllValues(string $app, string $prefix = '', bool $filtered = false): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function searchValues(string $key, bool $lazy = false, ?int $typedAs = null): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function getValueString(string $app, string $key, string $default = '', bool $lazy = false): string {
+		return (string)(($this->config[$app] ?? [])[$key] ?? $default);
+	}
+
+	public function getValueInt(string $app, string $key, int $default = 0, bool $lazy = false): int {
+		return (int)(($this->config[$app] ?? [])[$key] ?? $default);
+	}
+
+	public function getValueFloat(string $app, string $key, float $default = 0, bool $lazy = false): float {
+		return (float)(($this->config[$app] ?? [])[$key] ?? $default);
+	}
+
+	public function getValueBool(string $app, string $key, bool $default = false, bool $lazy = false): bool {
+		return (bool)(($this->config[$app] ?? [])[$key] ?? $default);
+	}
+
+	public function getValueArray(string $app, string $key, array $default = [], bool $lazy = false): array {
+		return ($this->config[$app] ?? [])[$key] ?? $default;
+	}
+
+	public function getValueType(string $app, string $key, ?bool $lazy = null): int {
+		throw new \Exception('not implemented');
+	}
+
+	public function setValueString(string $app, string $key, string $value, bool $lazy = false, bool $sensitive = false): bool {
+		$this->config[$app][$key] = $value;
+		return true;
+	}
+
+	public function setValueInt(string $app, string $key, int $value, bool $lazy = false, bool $sensitive = false): bool {
+		$this->config[$app][$key] = $value;
+		return true;
+	}
+
+	public function setValueFloat(string $app, string $key, float $value, bool $lazy = false, bool $sensitive = false): bool {
+		$this->config[$app][$key] = $value;
+		return true;
+	}
+
+	public function setValueBool(string $app, string $key, bool $value, bool $lazy = false): bool {
+		$this->config[$app][$key] = $value;
+		return true;
+	}
+
+	public function setValueArray(string $app, string $key, array $value, bool $lazy = false, bool $sensitive = false): bool {
+		$this->config[$app][$key] = $value;
+		return true;
+	}
+
+	public function updateSensitive(string $app, string $key, bool $sensitive): bool {
+		throw new \Exception('not implemented');
+	}
+
+	public function updateLazy(string $app, string $key, bool $lazy): bool {
+		throw new \Exception('not implemented');
+	}
+
+	public function getDetails(string $app, string $key): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function convertTypeToInt(string $type): int {
+		return match (strtolower($type)) {
+			'mixed' => IAppConfig::VALUE_MIXED,
+			'string' => IAppConfig::VALUE_STRING,
+			'integer' => IAppConfig::VALUE_INT,
+			'float' => IAppConfig::VALUE_FLOAT,
+			'boolean' => IAppConfig::VALUE_BOOL,
+			'array' => IAppConfig::VALUE_ARRAY,
+			default => throw new AppConfigIncorrectTypeException('Unknown type ' . $type)
+		};
+	}
+
+	public function convertTypeToString(int $type): string {
+		$type &= ~self::VALUE_SENSITIVE;
+
+		return match ($type) {
+			IAppConfig::VALUE_MIXED => 'mixed',
+			IAppConfig::VALUE_STRING => 'string',
+			IAppConfig::VALUE_INT => 'integer',
+			IAppConfig::VALUE_FLOAT => 'float',
+			IAppConfig::VALUE_BOOL => 'boolean',
+			IAppConfig::VALUE_ARRAY => 'array',
+			default => throw new AppConfigIncorrectTypeException('Unknown numeric type ' . $type)
+		};
+	}
+
+	public function deleteKey(string $app, string $key): void {
+		if ($this->hasKey($app, $key)) {
+			unset($this->config[$app][$key]);
+		}
+	}
+
+	public function deleteApp(string $app): void {
+		if (isset($this->config[$app])) {
+			unset($this->config[$app]);
+		}
+	}
+
+	public function clearCache(bool $reload = false): void {
+	}
+
+	public function searchKeys(string $app, string $prefix = '', bool $lazy = false): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function getKeyDetails(string $app, string $key): array {
+		throw new \Exception('not implemented');
+	}
+
+	public function getAppInstalledVersions(bool $onlyEnabled = false): array {
+		throw new \Exception('not implemented');
+	}
+}