test(process): add process signaler unit coverage

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/php/Unit/Service/Process/ProcessSignalerTest.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Libresign\Tests\Unit\Service\Process;
+
+use OCA\Libresign\Service\Process\ProcessSignaler;
+use OCA\Libresign\Tests\Unit\TestCase;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Psr\Log\LoggerInterface;
+
+class ProcessSignalerTest extends TestCase {
+	#[DataProvider('provideInvalidPids')]
+	public function testIsRunningReturnsFalseForInvalidPid(int $pid): void {
+		$signaler = new ProcessSignaler($this->createMock(LoggerInterface::class));
+
+		$this->assertFalse($signaler->isRunning($pid));
+	}
+
+	#[DataProvider('provideInvalidPids')]
+	public function testStopPidReturnsFalseForInvalidPid(int $pid): void {
+		$signaler = new ProcessSignaler($this->createMock(LoggerInterface::class));
+
+		$this->assertFalse($signaler->stopPid($pid));
+	}
+
+	/**
+	 * @return array<string, array{0: int}>
+	 */
+	public static function provideInvalidPids(): array {
+		return [
+			'zero' => [0],
+			'negative' => [-1],
+		];
+	}
+}