diff --git a/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php b/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
index 335016c39..60a39d413 100644
--- a/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
@@ -21,7 +21,7 @@ class iTopConfigParserTest extends ItopTestCase
 
 		clearstatcache();
 		$this->sConfigPath = utils::GetConfigFilePath();
-		$this->tmpSavePath = tempnam('/tmp/', 'config-itop');
+		$this->tmpSavePath = tempnam(sys_get_temp_dir(), 'config-itop');
 
 		$this->conf_exists = is_file($this->sConfigPath);
 		if ($this->conf_exists)
@@ -156,8 +156,8 @@ class iTopConfigParserTest extends ItopTestCase
 	 */
 	public function testConfigWriteToFile()
 	{
-		$tmpConfigFileBeforePath = tempnam( '/tmp/', 'config-itop');
-		$tmpConfigFileAfterPath = tempnam( '/tmp/', 'config-itop');
+		$tmpConfigFileBeforePath = tempnam( sys_get_temp_dir(), 'config-itop');
+		$tmpConfigFileAfterPath = tempnam( sys_get_temp_dir(), 'config-itop');
 
 		//create new config file
 		$sConfigFile = utils::GetConfig()->GetLoadedFile();
diff --git a/tests/php-unit-tests/unitary-tests/setup/unattended-install/InstallationFileServiceTest.php b/tests/php-unit-tests/unitary-tests/setup/unattended-install/InstallationFileServiceTest.php
index b463cff36..6b2f8196c 100644
--- a/tests/php-unit-tests/unitary-tests/setup/unattended-install/InstallationFileServiceTest.php
+++ b/tests/php-unit-tests/unitary-tests/setup/unattended-install/InstallationFileServiceTest.php
@@ -287,8 +287,8 @@ class InstallationFileServiceTest extends ItopTestCase {
 
 	private function GetMockListOfFoundModules() : array {
 		$sJsonContent = file_get_contents(realpath(__DIR__ . '/resources/AnalyzeInstallation.json'));
-		$sJsonContent = str_replace('ROOTDIR_TOREPLACE', APPROOT, $sJsonContent);
-		return json_decode($sJsonContent, true);
+		$sJsonContent = str_replace('ROOTDIR_TOREPLACE', addslashes(APPROOT), $sJsonContent);
+        return json_decode($sJsonContent, true);
 	}
 
 	/**
diff --git a/tests/php-unit-tests/unitary-tests/setup/unattended-install/UnattendedInstallTest.php b/tests/php-unit-tests/unitary-tests/setup/unattended-install/UnattendedInstallTest.php
index cde7af01a..77116c351 100644
--- a/tests/php-unit-tests/unitary-tests/setup/unattended-install/UnattendedInstallTest.php
+++ b/tests/php-unit-tests/unitary-tests/setup/unattended-install/UnattendedInstallTest.php
@@ -69,6 +69,12 @@ class UnattendedInstallTest extends ItopDataTestCase
 		$sOutput = implode('\n', $aOutput);
 		var_dump($sOutput);
 		$this->assertStringContainsString("Missing mandatory argument `--param-file`", $sOutput);
-		$this->assertEquals(255, $iCode);
+        if (DIRECTORY_SEPARATOR === '\\') {
+            // Windows
+            $this->assertEquals(-1, $iCode);
+        } else {
+            // Linux
+            $this->assertEquals(255, $iCode);
+        }
 	}
 }