diff --git a/README.md b/README.md
index 01228195..d391c01b 100644
--- a/README.md
+++ b/README.md
@@ -128,6 +128,26 @@ php occ serverinfo:update-storage-statistics -v --output=json_pretty
 }
 ```
 
-Show phpinfo
+##### Enforce default os (>= Nextcloud 28)
+
+To obtain information about your server, the serverinfo app reads files outside the application directory (e.g. /proc on Linux) or executes shell commands (e.g. df on Linux). 
+
+If you don't want that (for example, to avoid open_basedir warnings) enforce the default os. The default os only returns the hostname.
+
+Enable:
+
+``php occ config:app:set --value=yes serverinfo force_default_os``
+
+Disable:
+
+``php occ config:app:delete serverinfo force_default_os``
+
+##### Show phpinfo (>= Nextcloud 28)
+
+Enable:
 
 ``php occ config:app:set --value=yes serverinfo phpinfo``
+
+Disable:
+
+``php occ config:app:delete serverinfo phpinfo``
diff --git a/lib/OperatingSystems/DefaultOs.php b/lib/OperatingSystems/DefaultOs.php
index 23f06147..8b4e4552 100644
--- a/lib/OperatingSystems/DefaultOs.php
+++ b/lib/OperatingSystems/DefaultOs.php
@@ -23,259 +23,46 @@
 
 namespace OCA\ServerInfo\OperatingSystems;
 
-use OCA\ServerInfo\Resources\Disk;
 use OCA\ServerInfo\Resources\Memory;
-use OCA\ServerInfo\Resources\NetInterface;
-use RuntimeException;
 
 class DefaultOs implements IOperatingSystem {
-	private const AF_INET = 2;
-	private const AF_INET6 = 10;
-
 	public function supported(): bool {
-		return true;
+		return false;
 	}
 
 	public function getMemory(): Memory {
-		$data = new Memory();
-
-		try {
-			$meminfo = $this->readContent('/proc/meminfo');
-		} catch (RuntimeException $e) {
-			return $data;
-		}
-
-		$matches = [];
-		$pattern = '/(?<Key>(?:MemTotal|MemFree|MemAvailable|SwapTotal|SwapFree)+):\s+(?<Value>\d+)\s+(?<Unit>\w{2})/';
-
-		$result = preg_match_all($pattern, $meminfo, $matches);
-		if ($result === 0 || $result === false) {
-			return $data;
-		}
-
-		foreach ($matches['Key'] as $i => $key) {
-			// Value is always in KB: https://github.com/torvalds/linux/blob/c70672d8d316ebd46ea447effadfe57ab7a30a50/fs/proc/meminfo.c#L58-L60
-			$value = (int)((int)$matches['Value'][$i] / 1024);
-
-			switch ($key) {
-				case 'MemTotal':
-					$data->setMemTotal($value);
-					break;
-				case 'MemFree':
-					$data->setMemFree($value);
-					break;
-				case 'MemAvailable':
-					$data->setMemAvailable($value);
-					break;
-				case 'SwapTotal':
-					$data->setSwapTotal($value);
-					break;
-				case 'SwapFree':
-					$data->setSwapFree($value);
-					break;
-			}
-		}
-
-		return $data;
+		return new Memory();
 	}
 
 	public function getCpuName(): string {
-		$data = 'Unknown Processor';
-
-		try {
-			$cpuinfo = $this->readContent('/proc/cpuinfo');
-		} catch (RuntimeException $e) {
-			return $data;
-		}
-
-		$matches = [];
-
-		if (str_contains($cpuinfo, 'Raspberry Pi')) {
-			$pattern = '/Model\s+:\s(.+)/';
-		} elseif (str_contains($cpuinfo, 'PowerNV') || str_contains($cpuinfo, 'CHRP IBM pSeries')) {
-			$pattern = '/cpu\s+:\s+(.+)/';
-		} else {
-			$pattern = '/model name\s:\s(.+)/';
-		}
-
-		$result = preg_match_all($pattern, $cpuinfo, $matches);
-		if ($result === 0 || $result === false) {
-			return $data;
-		}
-
-		$model = $matches[1][0];
-
-		$pattern = '/processor\s+:\s(.+)/';
-
-		preg_match_all($pattern, $cpuinfo, $matches);
-		$cores = count($matches[1]);
-
-		if ($cores === 1) {
-			$data = $model . ' (1 core)';
-		} else {
-			$data = $model . ' (' . $cores . ' cores)';
-		}
-
-		return $data;
+		return 'Unknown Processor';
 	}
 
 	public function getTime(): string {
-		return (string)shell_exec('date');
+		return '';
 	}
 
 	public function getUptime(): int {
-		$data = -1;
-
-		try {
-			$uptime = $this->readContent('/proc/uptime');
-		} catch (RuntimeException $e) {
-			return $data;
-		}
-
-		[$uptimeInSeconds,] = array_map('intval', explode(' ', $uptime));
-
-		return $uptimeInSeconds;
+		return -1;
 	}
 
 	public function getNetworkInfo(): array {
-		$result = [];
-		$result['hostname'] = \gethostname();
-		$dns = shell_exec('cat /etc/resolv.conf |grep -i \'^nameserver\'|head -n1|cut -d \' \' -f2');
-		$result['dns'] = $dns;
-		$gw = shell_exec('ip route | awk \'/default/ { print $3 }\'');
-		$result['gateway'] = $gw;
-		return $result;
+		return [
+			'hostname' => \gethostname(),
+			'dns' => '',
+			'gateway' => '',
+		];
 	}
 
 	public function getNetworkInterfaces(): array {
-		$data = [];
-
-		foreach ($this->getNetInterfaces() as $interfaceName => $interface) {
-			$netInterface = new NetInterface($interfaceName, $interface['up']);
-			$data[] = $netInterface;
-
-			foreach ($interface['unicast'] as $unicast) {
-				if (isset($unicast['family'])) {
-					if ($unicast['family'] === self::AF_INET) {
-						$netInterface->addIPv4($unicast['address']);
-					}
-					if ($unicast['family'] === self::AF_INET6) {
-						$netInterface->addIPv6($unicast['address']);
-					}
-				}
-			}
-
-			if ($netInterface->isLoopback()) {
-				continue;
-			}
-
-			$interfacePath = '/sys/class/net/' . $interfaceName;
-
-			try {
-				$netInterface->setMAC($this->readContent($interfacePath . '/address'));
-
-				$speed = (int)$this->readContent($interfacePath . '/speed');
-				if ($speed >= 1000) {
-					$netInterface->setSpeed($speed / 1000 . ' Gbps');
-				} else {
-					$netInterface->setSpeed($speed . ' Mbps');
-				}
-
-				$netInterface->setDuplex($this->readContent($interfacePath . '/duplex'));
-			} catch (RuntimeException $e) {
-				// unable to read interface data
-			}
-		}
-
-		return $data;
+		return [];
 	}
 
 	public function getDiskInfo(): array {
-		$data = [];
-
-		try {
-			$disks = $this->executeCommand('df -TPk');
-		} catch (RuntimeException $e) {
-			return $data;
-		}
-
-		$matches = [];
-		$pattern = '/^(?<Filesystem>[\S]+)\s*(?<Type>[\S]+)\s*(?<Blocks>\d+)\s*(?<Used>\d+)\s*(?<Available>\d+)\s*(?<Capacity>\d+%)\s*(?<Mounted>[\w\/-]+)$/m';
-
-		$result = preg_match_all($pattern, $disks, $matches);
-		if ($result === 0 || $result === false) {
-			return $data;
-		}
-
-		foreach ($matches['Filesystem'] as $i => $filesystem) {
-			if (in_array($matches['Type'][$i], ['tmpfs', 'devtmpfs', 'squashfs', 'overlay'], false)) {
-				continue;
-			} elseif (in_array($matches['Mounted'][$i], ['/etc/hostname', '/etc/hosts'], false)) {
-				continue;
-			}
-
-			$disk = new Disk();
-			$disk->setDevice($filesystem);
-			$disk->setFs($matches['Type'][$i]);
-			$disk->setUsed((int)((int)$matches['Used'][$i] / 1024));
-			$disk->setAvailable((int)((int)$matches['Available'][$i] / 1024));
-			$disk->setPercent($matches['Capacity'][$i]);
-			$disk->setMount($matches['Mounted'][$i]);
-
-			$data[] = $disk;
-		}
-
-		return $data;
+		return [];
 	}
 
 	public function getThermalZones(): array {
-		$thermalZones = glob('/sys/class/thermal/thermal_zone*') ?: [];
-		$result = [];
-
-		foreach ($thermalZones as $thermalZone) {
-			$tzone = [];
-			try {
-				$tzone['hash'] = md5($thermalZone);
-				$tzone['type'] = $this->readContent($thermalZone . '/type');
-				$tzone['temp'] = (float)((int)($this->readContent($thermalZone . '/temp')) / 1000);
-			} catch (RuntimeException $e) {
-				continue;
-			}
-			$result[] = $tzone;
-		}
-
-		return $result;
-	}
-
-	/**
-	 * @throws RuntimeException
-	 */
-	protected function readContent(string $filename): string {
-		$data = @file_get_contents($filename);
-		if ($data === false || $data === '') {
-			throw new RuntimeException('Unable to read: "' . $filename . '"');
-		}
-		return trim($data);
-	}
-
-	protected function executeCommand(string $command): string {
-		$output = @shell_exec(escapeshellcmd($command));
-		if ($output === false || $output === null || $output === '') {
-			throw new RuntimeException('No output for command: "' . $command . '"');
-		}
-		return $output;
-	}
-
-	/**
-	 * Wrapper for net_get_interfaces
-	 *
-	 * @throws RuntimeException
-	 */
-	protected function getNetInterfaces(): array {
-		$data = net_get_interfaces();
-		if ($data === false) {
-			throw new RuntimeException('Unable to get network interfaces');
-		}
-		return $data;
+		return [];
 	}
 }
diff --git a/lib/OperatingSystems/Linux.php b/lib/OperatingSystems/Linux.php
new file mode 100644
index 00000000..dc028848
--- /dev/null
+++ b/lib/OperatingSystems/Linux.php
@@ -0,0 +1,281 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @author Frank Karlitschek <frank@nextcloud.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\ServerInfo\OperatingSystems;
+
+use OCA\ServerInfo\Resources\Disk;
+use OCA\ServerInfo\Resources\Memory;
+use OCA\ServerInfo\Resources\NetInterface;
+use RuntimeException;
+
+class Linux implements IOperatingSystem {
+	private const AF_INET = 2;
+	private const AF_INET6 = 10;
+
+	public function supported(): bool {
+		return true;
+	}
+
+	public function getMemory(): Memory {
+		$data = new Memory();
+
+		try {
+			$meminfo = $this->readContent('/proc/meminfo');
+		} catch (RuntimeException $e) {
+			return $data;
+		}
+
+		$matches = [];
+		$pattern = '/(?<Key>(?:MemTotal|MemFree|MemAvailable|SwapTotal|SwapFree)+):\s+(?<Value>\d+)\s+(?<Unit>\w{2})/';
+
+		$result = preg_match_all($pattern, $meminfo, $matches);
+		if ($result === 0 || $result === false) {
+			return $data;
+		}
+
+		foreach ($matches['Key'] as $i => $key) {
+			// Value is always in KB: https://github.com/torvalds/linux/blob/c70672d8d316ebd46ea447effadfe57ab7a30a50/fs/proc/meminfo.c#L58-L60
+			$value = (int)((int)$matches['Value'][$i] / 1024);
+
+			switch ($key) {
+				case 'MemTotal':
+					$data->setMemTotal($value);
+					break;
+				case 'MemFree':
+					$data->setMemFree($value);
+					break;
+				case 'MemAvailable':
+					$data->setMemAvailable($value);
+					break;
+				case 'SwapTotal':
+					$data->setSwapTotal($value);
+					break;
+				case 'SwapFree':
+					$data->setSwapFree($value);
+					break;
+			}
+		}
+
+		return $data;
+	}
+
+	public function getCpuName(): string {
+		$data = 'Unknown Processor';
+
+		try {
+			$cpuinfo = $this->readContent('/proc/cpuinfo');
+		} catch (RuntimeException $e) {
+			return $data;
+		}
+
+		$matches = [];
+
+		if (str_contains($cpuinfo, 'Raspberry Pi')) {
+			$pattern = '/Model\s+:\s(.+)/';
+		} elseif (str_contains($cpuinfo, 'PowerNV') || str_contains($cpuinfo, 'CHRP IBM pSeries')) {
+			$pattern = '/cpu\s+:\s+(.+)/';
+		} else {
+			$pattern = '/model name\s:\s(.+)/';
+		}
+
+		$result = preg_match_all($pattern, $cpuinfo, $matches);
+		if ($result === 0 || $result === false) {
+			return $data;
+		}
+
+		$model = $matches[1][0];
+
+		$pattern = '/processor\s+:\s(.+)/';
+
+		preg_match_all($pattern, $cpuinfo, $matches);
+		$cores = count($matches[1]);
+
+		if ($cores === 1) {
+			$data = $model . ' (1 core)';
+		} else {
+			$data = $model . ' (' . $cores . ' cores)';
+		}
+
+		return $data;
+	}
+
+	public function getTime(): string {
+		return (string)shell_exec('date');
+	}
+
+	public function getUptime(): int {
+		$data = -1;
+
+		try {
+			$uptime = $this->readContent('/proc/uptime');
+		} catch (RuntimeException $e) {
+			return $data;
+		}
+
+		[$uptimeInSeconds,] = array_map('intval', explode(' ', $uptime));
+
+		return $uptimeInSeconds;
+	}
+
+	public function getNetworkInfo(): array {
+		$result = [];
+		$result['hostname'] = \gethostname();
+		$dns = shell_exec('cat /etc/resolv.conf |grep -i \'^nameserver\'|head -n1|cut -d \' \' -f2');
+		$result['dns'] = $dns;
+		$gw = shell_exec('ip route | awk \'/default/ { print $3 }\'');
+		$result['gateway'] = $gw;
+		return $result;
+	}
+
+	public function getNetworkInterfaces(): array {
+		$data = [];
+
+		foreach ($this->getNetInterfaces() as $interfaceName => $interface) {
+			$netInterface = new NetInterface($interfaceName, $interface['up']);
+			$data[] = $netInterface;
+
+			foreach ($interface['unicast'] as $unicast) {
+				if (isset($unicast['family'])) {
+					if ($unicast['family'] === self::AF_INET) {
+						$netInterface->addIPv4($unicast['address']);
+					}
+					if ($unicast['family'] === self::AF_INET6) {
+						$netInterface->addIPv6($unicast['address']);
+					}
+				}
+			}
+
+			if ($netInterface->isLoopback()) {
+				continue;
+			}
+
+			$interfacePath = '/sys/class/net/' . $interfaceName;
+
+			try {
+				$netInterface->setMAC($this->readContent($interfacePath . '/address'));
+
+				$speed = (int)$this->readContent($interfacePath . '/speed');
+				if ($speed >= 1000) {
+					$netInterface->setSpeed($speed / 1000 . ' Gbps');
+				} else {
+					$netInterface->setSpeed($speed . ' Mbps');
+				}
+
+				$netInterface->setDuplex($this->readContent($interfacePath . '/duplex'));
+			} catch (RuntimeException $e) {
+				// unable to read interface data
+			}
+		}
+
+		return $data;
+	}
+
+	public function getDiskInfo(): array {
+		$data = [];
+
+		try {
+			$disks = $this->executeCommand('df -TPk');
+		} catch (RuntimeException $e) {
+			return $data;
+		}
+
+		$matches = [];
+		$pattern = '/^(?<Filesystem>[\S]+)\s*(?<Type>[\S]+)\s*(?<Blocks>\d+)\s*(?<Used>\d+)\s*(?<Available>\d+)\s*(?<Capacity>\d+%)\s*(?<Mounted>[\w\/-]+)$/m';
+
+		$result = preg_match_all($pattern, $disks, $matches);
+		if ($result === 0 || $result === false) {
+			return $data;
+		}
+
+		foreach ($matches['Filesystem'] as $i => $filesystem) {
+			if (in_array($matches['Type'][$i], ['tmpfs', 'devtmpfs', 'squashfs', 'overlay'], false)) {
+				continue;
+			} elseif (in_array($matches['Mounted'][$i], ['/etc/hostname', '/etc/hosts'], false)) {
+				continue;
+			}
+
+			$disk = new Disk();
+			$disk->setDevice($filesystem);
+			$disk->setFs($matches['Type'][$i]);
+			$disk->setUsed((int)((int)$matches['Used'][$i] / 1024));
+			$disk->setAvailable((int)((int)$matches['Available'][$i] / 1024));
+			$disk->setPercent($matches['Capacity'][$i]);
+			$disk->setMount($matches['Mounted'][$i]);
+
+			$data[] = $disk;
+		}
+
+		return $data;
+	}
+
+	public function getThermalZones(): array {
+		$thermalZones = glob('/sys/class/thermal/thermal_zone*') ?: [];
+		$result = [];
+
+		foreach ($thermalZones as $thermalZone) {
+			$tzone = [];
+			try {
+				$tzone['hash'] = md5($thermalZone);
+				$tzone['type'] = $this->readContent($thermalZone . '/type');
+				$tzone['temp'] = (float)((int)($this->readContent($thermalZone . '/temp')) / 1000);
+			} catch (RuntimeException $e) {
+				continue;
+			}
+			$result[] = $tzone;
+		}
+
+		return $result;
+	}
+
+	/**
+	 * @throws RuntimeException
+	 */
+	protected function readContent(string $filename): string {
+		$data = @file_get_contents($filename);
+		if ($data === false || $data === '') {
+			throw new RuntimeException('Unable to read: "' . $filename . '"');
+		}
+		return trim($data);
+	}
+
+	protected function executeCommand(string $command): string {
+		$output = @shell_exec(escapeshellcmd($command));
+		if ($output === false || $output === null || $output === '') {
+			throw new RuntimeException('No output for command: "' . $command . '"');
+		}
+		return $output;
+	}
+
+	/**
+	 * Wrapper for net_get_interfaces
+	 *
+	 * @throws RuntimeException
+	 */
+	protected function getNetInterfaces(): array {
+		$data = net_get_interfaces();
+		if ($data === false) {
+			throw new RuntimeException('Unable to get network interfaces');
+		}
+		return $data;
+	}
+}
diff --git a/lib/Os.php b/lib/Os.php
index b3448f77..420b8cd6 100644
--- a/lib/Os.php
+++ b/lib/Os.php
@@ -26,25 +26,20 @@
 use OCA\ServerInfo\OperatingSystems\DefaultOs;
 use OCA\ServerInfo\OperatingSystems\FreeBSD;
 use OCA\ServerInfo\OperatingSystems\IOperatingSystem;
+use OCA\ServerInfo\OperatingSystems\Linux;
 use OCA\ServerInfo\Resources\Memory;
+use OCP\IConfig;
 
 class Os implements IOperatingSystem {
-	protected IOperatingSystem $backend;
+	private IOperatingSystem $backend;
 
-	/**
-	 * Os constructor.
-	 */
-	public function __construct() {
-		if (PHP_OS === 'FreeBSD') {
-			$this->backend = new FreeBSD();
-		} else {
-			$this->backend = new DefaultOs();
-		}
+	public function __construct(IConfig $config) {
+		$forceDefaultOs = $config->getAppValue('serverinfo', 'force_default_os', 'no') === 'yes';
+		$this->backend = $this->getBackend($forceDefaultOs);
 	}
 
 	public function supported(): bool {
-		$data = $this->backend->supported();
-		return $data;
+		return $this->backend->supported();
 	}
 
 	public function getHostname(): string {
@@ -101,8 +96,7 @@ public function getDiskData(): array {
 	}
 
 	public function getNetworkInfo(): array {
-		$data = $this->backend->getNetworkInfo();
-		return $data;
+		return $this->backend->getNetworkInfo();
 	}
 
 	public function getNetworkInterfaces(): array {
@@ -110,7 +104,18 @@ public function getNetworkInterfaces(): array {
 	}
 
 	public function getThermalZones(): array {
-		$data = $this->backend->getThermalZones();
-		return $data;
+		return $this->backend->getThermalZones();
+	}
+
+	private function getBackend(bool $forceDefaultOs): IOperatingSystem {
+		if (!$forceDefaultOs) {
+			if (PHP_OS === 'Linux') {
+				return new Linux();
+			}
+			if (PHP_OS === 'FreeBSD') {
+				return new FreeBSD();
+			}
+		}
+		return new DefaultOs();
 	}
 }
diff --git a/lib/Resources/Memory.php b/lib/Resources/Memory.php
index 6b0b61ca..e8dbd71a 100644
--- a/lib/Resources/Memory.php
+++ b/lib/Resources/Memory.php
@@ -26,11 +26,11 @@
 namespace OCA\ServerInfo\Resources;
 
 class Memory {
-	private int $memTotal = -1;
-	private int $memFree = -1;
-	private int $memAvailable = -1;
-	private int $swapTotal = -1;
-	private int $swapFree = -1;
+	private int $memTotal = 0;
+	private int $memFree = 0;
+	private int $memAvailable = 0;
+	private int $swapTotal = 0;
+	private int $swapFree = 0;
 
 	/**
 	 * @return int in MB
diff --git a/tests/data/df_tp b/tests/data/linux_df_tp
similarity index 100%
rename from tests/data/df_tp
rename to tests/data/linux_df_tp
diff --git a/tests/data/meminfo b/tests/data/linux_meminfo
similarity index 100%
rename from tests/data/meminfo
rename to tests/data/linux_meminfo
diff --git a/tests/data/uptime b/tests/data/linux_uptime
similarity index 100%
rename from tests/data/uptime
rename to tests/data/linux_uptime
diff --git a/tests/lib/DefaultOsTest.php b/tests/lib/DefaultOsTest.php
index 51b81e3e..9958b503 100644
--- a/tests/lib/DefaultOsTest.php
+++ b/tests/lib/DefaultOsTest.php
@@ -27,244 +27,47 @@
 namespace OCA\ServerInfo\Tests;
 
 use OCA\ServerInfo\OperatingSystems\DefaultOs;
-use OCA\ServerInfo\Resources\Disk;
-use OCA\ServerInfo\Resources\Memory;
-use OCA\ServerInfo\Resources\NetInterface;
 use PHPUnit\Framework\MockObject\MockObject;
-use RuntimeException;
 use Test\TestCase;
 
-/**
- * Class DefaultOsTest
- *
- * @package OCA\ServerInfo\Tests
- */
 class DefaultOsTest extends TestCase {
-	/** @var DefaultOs&MockObject */
+	/** @var DefaultOs|MockObject */
 	protected $os;
 
 	protected function setUp(): void {
 		parent::setUp(); // TODO: Change the autogenerated stub
 
-		$this->os = $this->getMockBuilder(DefaultOs::class)
-			->disableOriginalConstructor()
-			->disableOriginalClone()
-			->disableArgumentCloning()
-			->disallowMockingUnknownTypes()
-			->setMethods(['readContent', 'executeCommand', 'getNetInterfaces'])
-			->getMock();
+		$this->os = new DefaultOs();
 	}
 
 	public function testGetMemory(): void {
-		$this->os->method('readContent')
-			->with('/proc/meminfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/meminfo'));
-
 		$memory = $this->os->getMemory();
 
-		$this->assertEquals(15947, $memory->getMemTotal());
-		$this->assertEquals(2386, $memory->getMemFree());
-		$this->assertEquals(7495, $memory->getMemAvailable());
-		$this->assertEquals(975, $memory->getSwapTotal());
-		$this->assertEquals(896, $memory->getSwapFree());
-	}
-
-	public function testGetMemoryNoData(): void {
-		$this->os->method('readContent')
-			->with('/proc/meminfo')
-			->willThrowException(new RuntimeException('Unable to read: "/proc/meminfo"'));
-
-		$this->assertEquals(new Memory(), $this->os->getMemory());
-	}
-
-	public function testGetMemoryInvalidData(): void {
-		$this->os->method('readContent')
-			->with('/proc/meminfo')
-			->willReturn('invalid_data');
-
-		$this->assertEquals(new Memory(), $this->os->getMemory());
+		$this->assertEquals(-1, $memory->getMemTotal());
+		$this->assertEquals(-1, $memory->getMemFree());
+		$this->assertEquals(-1, $memory->getMemAvailable());
+		$this->assertEquals(-1, $memory->getSwapTotal());
+		$this->assertEquals(-1, $memory->getSwapFree());
 	}
 
 	public function testGetCpuName(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo'));
-
-		$this->assertEquals('Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (4 cores)', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNameOneCore(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_one_core'));
-
-		$this->assertEquals('Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (1 core)', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNamePi3b(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_pi3b'));
-
-		$this->assertEquals('Raspberry Pi 3 Model B Rev 1.2 (4 cores)', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNamePi4b(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_pi4b'));
-
-		$this->assertEquals('Raspberry Pi 4 Model B Rev 1.2 (4 cores)', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNameOpenPower(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_openpower'));
-
-		$this->assertEquals('POWER9, altivec supported (176 cores)', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNameNoData(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willThrowException(new RuntimeException('Unable to read: "/proc/cpuinfo"'));
-
-		$this->assertEquals('Unknown Processor', $this->os->getCpuName());
-	}
-
-	public function testGetCpuNameInvalidData(): void {
-		$this->os->method('readContent')
-			->with('/proc/cpuinfo')
-			->willReturn('invalid_data');
-
 		$this->assertEquals('Unknown Processor', $this->os->getCpuName());
 	}
 
 	public function testGetUptime(): void {
-		$this->os->method('readContent')
-			->with('/proc/uptime')
-			->willReturn(file_get_contents(__DIR__ . '/../data/uptime'));
-
-		$this->assertEquals(13278, $this->os->getUptime());
-	}
-
-	public function testGetUptimeNoData(): void {
-		$this->os->method('readContent')
-			->with('/proc/uptime')
-			->willThrowException(new RuntimeException('Unable to read: "/proc/uptime"'));
-
 		$this->assertEquals(-1, $this->os->getUptime());
 	}
 
-	public function testGetDiskInfo(): void {
-		$this->os->method('executeCommand')
-			->with('df -TPk')
-			->willReturn(file_get_contents(__DIR__ . '/../data/df_tp'));
-
-		$disk1 = new Disk();
-		$disk1->setDevice('/dev/mapper/homestead--vg-root');
-		$disk1->setFs('ext4');
-		$disk1->setUsed(6060);
-		$disk1->setAvailable(46212);
-		$disk1->setPercent('12%');
-		$disk1->setMount('/');
-
-		$disk2 = new Disk();
-		$disk2->setDevice('/dev/mapper/homestead--vg-mysql--master');
-		$disk2->setFs('ext4');
-		$disk2->setUsed(251);
-		$disk2->setAvailable(60451);
-		$disk2->setPercent('1%');
-		$disk2->setMount('/homestead-vg/master');
-
-		$disk3 = new Disk();
-		$disk3->setDevice('vagrant');
-		$disk3->setFs('vboxsf');
-		$disk3->setUsed(600421);
-		$disk3->setAvailable(335246);
-		$disk3->setPercent('65%');
-		$disk3->setMount('/vagrant');
-
-		$disk4 = new Disk();
-		$disk4->setDevice('home_vagrant_code');
-		$disk4->setFs('vboxsf');
-		$disk4->setUsed(600421);
-		$disk4->setAvailable(335246);
-		$disk4->setPercent('65%');
-		$disk4->setMount('/home/vagrant/code');
-
-		$disk5 = new Disk();
-		$disk5->setDevice('nfs.example.com:/export');
-		$disk5->setFs('nfs4');
-		$disk5->setUsed(0);
-		$disk5->setAvailable(1);
-		$disk5->setPercent('0%');
-		$disk5->setMount('/nfs');
-
-		$disk6 = new Disk();
-		$disk6->setDevice('198.51.100.42:/storage');
-		$disk6->setFs('fuse.sshfs');
-		$disk6->setUsed(51);
-		$disk6->setAvailable(44354);
-		$disk6->setPercent('1%');
-		$disk6->setMount('/mnt/sshfs');
-
-		$this->assertEquals([$disk1, $disk2, $disk3, $disk4, $disk5, $disk6], $this->os->getDiskInfo());
-	}
-
-	public function testGetDiskInfoNoCommandOutput(): void {
-		$this->os->method('executeCommand')
-			->with('df -TP')
-			->willThrowException(new RuntimeException('No output for command "df -TP"'));
-
-		$this->assertEquals([], $this->os->getDiskInfo());
-	}
-
-	public function testGetDiskInfoInvalidCommandOutput(): void {
-		$this->os->method('executeCommand')
-			->with('df -TP')
-			->willReturn('invalid_data');
 
+	public function testGetDiskInfo(): void {
 		$this->assertEquals([], $this->os->getDiskInfo());
 	}
 
 	public function testSupported(): void {
-		$this->assertTrue($this->os->supported());
+		$this->assertFalse($this->os->supported());
 	}
 
 	public function testGetNetworkInterfaces(): void {
-		$this->os->method('getNetInterfaces')
-			->willReturn(json_decode(file_get_contents(__DIR__ . '/../data/linux_net_get_interfaces.json'), true, 512, JSON_THROW_ON_ERROR));
-		$this->os->method('readContent')
-			->willReturnCallback(static function ($filename) {
-				if ($filename === '/sys/class/net/eth0/address') {
-					return '02:42:ac:13:00:0a';
-				}
-				if ($filename === '/sys/class/net/eth0/speed') {
-					return '10000';
-				}
-				if ($filename === '/sys/class/net/eth0/duplex') {
-					return 'full';
-				}
-				throw new RuntimeException();
-			});
-
-
-		$net1 = new NetInterface('lo', true);
-		$net1->addIPv4('127.0.0.1');
-		$net1->addIPv6('::1');
-
-		$net2 = new NetInterface('eth0', true);
-		$net2->addIPv4('10.0.2.15');
-		$net2->addIPv6('fe80::a00:27ff:fe91:f84b');
-		$net2->setMAC('02:42:ac:13:00:0a');
-		$net2->setSpeed('10 Gbps');
-		$net2->setDuplex('full');
-
-		$expected = [$net1, $net2];
-		$actual = $this->os->getNetworkInterfaces();
-
-		$this->assertEquals($expected, $actual);
+		$this->assertEquals([], $this->os->getNetworkInterfaces());
 	}
 }
diff --git a/tests/lib/LinuxTest.php b/tests/lib/LinuxTest.php
new file mode 100644
index 00000000..7d979c0a
--- /dev/null
+++ b/tests/lib/LinuxTest.php
@@ -0,0 +1,265 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2020 Daniel Kesselberg <mail@danielkesselberg.de>
+ *
+ * @author Daniel Kesselberg <mail@danielkesselberg.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\ServerInfo\Tests;
+
+use OCA\ServerInfo\OperatingSystems\Linux;
+use OCA\ServerInfo\Resources\Disk;
+use OCA\ServerInfo\Resources\Memory;
+use OCA\ServerInfo\Resources\NetInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+use RuntimeException;
+use Test\TestCase;
+
+class LinuxTest extends TestCase {
+	/** @var Linux&MockObject */
+	protected $os;
+
+	protected function setUp(): void {
+		parent::setUp(); // TODO: Change the autogenerated stub
+
+		$this->os = $this->getMockBuilder(Linux::class)
+			->disableOriginalConstructor()
+			->disableOriginalClone()
+			->disableArgumentCloning()
+			->disallowMockingUnknownTypes()
+			->setMethods(['readContent', 'executeCommand', 'getNetInterfaces'])
+			->getMock();
+	}
+
+	public function testGetMemory(): void {
+		$this->os->method('readContent')
+			->with('/proc/meminfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_meminfo'));
+
+		$memory = $this->os->getMemory();
+
+		$this->assertEquals(15947, $memory->getMemTotal());
+		$this->assertEquals(2386, $memory->getMemFree());
+		$this->assertEquals(7495, $memory->getMemAvailable());
+		$this->assertEquals(975, $memory->getSwapTotal());
+		$this->assertEquals(896, $memory->getSwapFree());
+	}
+
+	public function testGetMemoryNoData(): void {
+		$this->os->method('readContent')
+			->with('/proc/meminfo')
+			->willThrowException(new RuntimeException('Unable to read: "/proc/meminfo"'));
+
+		$this->assertEquals(new Memory(), $this->os->getMemory());
+	}
+
+	public function testGetMemoryInvalidData(): void {
+		$this->os->method('readContent')
+			->with('/proc/meminfo')
+			->willReturn('invalid_data');
+
+		$this->assertEquals(new Memory(), $this->os->getMemory());
+	}
+
+	public function testGetCpuName(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo'));
+
+		$this->assertEquals('Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (4 cores)', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNameOneCore(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_one_core'));
+
+		$this->assertEquals('Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (1 core)', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNamePi3b(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_pi3b'));
+
+		$this->assertEquals('Raspberry Pi 3 Model B Rev 1.2 (4 cores)', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNamePi4b(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_pi4b'));
+
+		$this->assertEquals('Raspberry Pi 4 Model B Rev 1.2 (4 cores)', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNameOpenPower(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_cpuinfo_openpower'));
+
+		$this->assertEquals('POWER9, altivec supported (176 cores)', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNameNoData(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willThrowException(new RuntimeException('Unable to read: "/proc/cpuinfo"'));
+
+		$this->assertEquals('Unknown Processor', $this->os->getCpuName());
+	}
+
+	public function testGetCpuNameInvalidData(): void {
+		$this->os->method('readContent')
+			->with('/proc/cpuinfo')
+			->willReturn('invalid_data');
+
+		$this->assertEquals('Unknown Processor', $this->os->getCpuName());
+	}
+
+	public function testGetUptime(): void {
+		$this->os->method('readContent')
+			->with('/proc/uptime')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_uptime'));
+
+		$this->assertEquals(13278, $this->os->getUptime());
+	}
+
+	public function testGetUptimeNoData(): void {
+		$this->os->method('readContent')
+			->with('/proc/uptime')
+			->willThrowException(new RuntimeException('Unable to read: "/proc/uptime"'));
+
+		$this->assertEquals(-1, $this->os->getUptime());
+	}
+
+	public function testGetDiskInfo(): void {
+		$this->os->method('executeCommand')
+			->with('df -TPk')
+			->willReturn(file_get_contents(__DIR__ . '/../data/linux_df_tp'));
+
+		$disk1 = new Disk();
+		$disk1->setDevice('/dev/mapper/homestead--vg-root');
+		$disk1->setFs('ext4');
+		$disk1->setUsed(6060);
+		$disk1->setAvailable(46212);
+		$disk1->setPercent('12%');
+		$disk1->setMount('/');
+
+		$disk2 = new Disk();
+		$disk2->setDevice('/dev/mapper/homestead--vg-mysql--master');
+		$disk2->setFs('ext4');
+		$disk2->setUsed(251);
+		$disk2->setAvailable(60451);
+		$disk2->setPercent('1%');
+		$disk2->setMount('/homestead-vg/master');
+
+		$disk3 = new Disk();
+		$disk3->setDevice('vagrant');
+		$disk3->setFs('vboxsf');
+		$disk3->setUsed(600421);
+		$disk3->setAvailable(335246);
+		$disk3->setPercent('65%');
+		$disk3->setMount('/vagrant');
+
+		$disk4 = new Disk();
+		$disk4->setDevice('home_vagrant_code');
+		$disk4->setFs('vboxsf');
+		$disk4->setUsed(600421);
+		$disk4->setAvailable(335246);
+		$disk4->setPercent('65%');
+		$disk4->setMount('/home/vagrant/code');
+
+		$disk5 = new Disk();
+		$disk5->setDevice('nfs.example.com:/export');
+		$disk5->setFs('nfs4');
+		$disk5->setUsed(0);
+		$disk5->setAvailable(1);
+		$disk5->setPercent('0%');
+		$disk5->setMount('/nfs');
+
+		$disk6 = new Disk();
+		$disk6->setDevice('198.51.100.42:/storage');
+		$disk6->setFs('fuse.sshfs');
+		$disk6->setUsed(51);
+		$disk6->setAvailable(44354);
+		$disk6->setPercent('1%');
+		$disk6->setMount('/mnt/sshfs');
+
+		$this->assertEquals([$disk1, $disk2, $disk3, $disk4, $disk5, $disk6], $this->os->getDiskInfo());
+	}
+
+	public function testGetDiskInfoNoCommandOutput(): void {
+		$this->os->method('executeCommand')
+			->with('df -TP')
+			->willThrowException(new RuntimeException('No output for command "df -TP"'));
+
+		$this->assertEquals([], $this->os->getDiskInfo());
+	}
+
+	public function testGetDiskInfoInvalidCommandOutput(): void {
+		$this->os->method('executeCommand')
+			->with('df -TP')
+			->willReturn('invalid_data');
+
+		$this->assertEquals([], $this->os->getDiskInfo());
+	}
+
+	public function testSupported(): void {
+		$this->assertTrue($this->os->supported());
+	}
+
+	public function testGetNetworkInterfaces(): void {
+		$this->os->method('getNetInterfaces')
+			->willReturn(json_decode(file_get_contents(__DIR__ . '/../data/linux_net_get_interfaces.json'), true, 512, JSON_THROW_ON_ERROR));
+		$this->os->method('readContent')
+			->willReturnCallback(static function ($filename) {
+				if ($filename === '/sys/class/net/eth0/address') {
+					return '02:42:ac:13:00:0a';
+				}
+				if ($filename === '/sys/class/net/eth0/speed') {
+					return '10000';
+				}
+				if ($filename === '/sys/class/net/eth0/duplex') {
+					return 'full';
+				}
+				throw new RuntimeException();
+			});
+
+
+		$net1 = new NetInterface('lo', true);
+		$net1->addIPv4('127.0.0.1');
+		$net1->addIPv6('::1');
+
+		$net2 = new NetInterface('eth0', true);
+		$net2->addIPv4('10.0.2.15');
+		$net2->addIPv6('fe80::a00:27ff:fe91:f84b');
+		$net2->setMAC('02:42:ac:13:00:0a');
+		$net2->setSpeed('10 Gbps');
+		$net2->setDuplex('full');
+
+		$expected = [$net1, $net2];
+		$actual = $this->os->getNetworkInterfaces();
+
+		$this->assertEquals($expected, $actual);
+	}
+}