diff --git a/setup/sequencers/DataAuditSequencer.php b/setup/sequencers/DataAuditSequencer.php
index 718692f5e..da487fb10 100644
--- a/setup/sequencers/DataAuditSequencer.php
+++ b/setup/sequencers/DataAuditSequencer.php
@@ -50,7 +50,7 @@ class DataAuditSequencer extends StepSequencer
 					return $this->GetNextStep('compile', 'Compiling the data model', 20, 'Copying...');
 
 				case 'compile':
-					$aSelectedModules = $this->oParams->Get('selected_modules');
+					$aSelectedModules = $this->oParams->Get('selected_modules', []);
 					$sSourceDir = $this->oParams->Get('source_dir', 'datamodels/latest');
 					$sExtensionDir = $this->oParams->Get('extensions_dir', 'extensions');
 					$aMiscOptions = $this->oParams->Get('options', []);
diff --git a/tests/php-unit-tests/unitary-tests/setup/ApplicationInstallSequencerFake.php b/tests/php-unit-tests/unitary-tests/setup/ApplicationInstallSequencerFake.php
deleted file mode 100644
index f0d5bf80e..000000000
--- a/tests/php-unit-tests/unitary-tests/setup/ApplicationInstallSequencerFake.php
+++ /dev/null
@@ -1,57 +0,0 @@
-<?php
-
-class ApplicationInstallSequencerFake extends ApplicationInstallSequencer
-{
-	public function __construct(Parameters $oParams)
-	{
-		parent::__construct($oParams);
-	}
-
-	protected function DoLogParameters($sPrefix = 'install-', $sOperation = '')
-	{
-
-	}
-	protected function DoCopy($aCopies)
-	{
-
-	}
-	protected function DoBackup($sBackupFileFormat, $sSourceConfigFile, $sMySQLBinDir = null)
-	{
-
-	}
-	protected function DoCompile($aRemovedExtensionCodes, $aSelectedModules, $sSourceDir, $sExtensionDir, $bUseSymbolicLinks = null, $bEnterMaintenanceMode = true)
-	{
-
-	}
-
-	protected function AfterDBCreate(
-		$aAdminParams,
-		$aSelectedModules
-	) {
-
-	}
-
-	protected function DoLoadFiles(
-		$aSelectedModules,
-		$bSampleData = false
-	) {
-
-	}
-
-	protected function DoCreateConfig(
-		$sPreviousConfigFile,
-		$sDataModelVersion,
-		$aSelectedModuleCodes,
-		$aSelectedExtensionCodes,
-		$sInstallComment = null
-	) {
-
-	}
-
-	protected function EnterReadOnlyMode()
-	{
-	}
-	protected function ExitReadOnlyMode()
-	{
-	}
-}
diff --git a/tests/php-unit-tests/unitary-tests/setup/DataAuditSequencerFake.php b/tests/php-unit-tests/unitary-tests/setup/DataAuditSequencerFake.php
deleted file mode 100644
index 8bc28625c..000000000
--- a/tests/php-unit-tests/unitary-tests/setup/DataAuditSequencerFake.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-class DataAuditSequencerFake extends DataAuditSequencer
-{
-	public function __construct(Parameters $oParams)
-	{
-		paret::__construct($oParams);
-	}
-
-	protected function DoCopy($aCopies)
-	{
-
-	}
-	protected function DoBackup($sBackupFileFormat, $sSourceConfigFile, $sMySQLBinDir = null)
-	{
-
-	}
-	protected function DoCompile($aRemovedExtensionCodes, $aSelectedModules, $sSourceDir, $sExtensionDir, $bUseSymbolicLinks = null, $bEnterMaintenanceMode = true)
-	{
-
-	}
-	protected function DoUpdateDBSchema($aSelectedModules)
-	{
-
-	}
-	protected function AfterDBCreate(
-		$aAdminParams,
-		$aSelectedModules
-	) {
-
-	}
-
-	protected function DoLoadFiles(
-		$aSelectedModules,
-		$bSampleData = false
-	) {
-
-	}
-
-	protected function DoCreateConfig(
-		$sPreviousConfigFile,
-		$sDataModelVersion,
-		$aSelectedModuleCodes,
-		$aSelectedExtensionCodes,
-		$sInstallComment = null
-	) {
-
-	}
-
-	protected function DoSetupAudit()
-	{
-
-	}
-	protected function DoCleanup()
-	{
-
-	}
-
-	protected function EnterReadOnlyMode()
-	{
-	}
-	protected function ExitReadOnlyMode()
-	{
-	}
-}
diff --git a/tests/php-unit-tests/unitary-tests/setup/StepSequencerTest.php b/tests/php-unit-tests/unitary-tests/setup/StepSequencerTest.php
deleted file mode 100644
index 1733e161a..000000000
--- a/tests/php-unit-tests/unitary-tests/setup/StepSequencerTest.php
+++ /dev/null
@@ -1,92 +0,0 @@
-<?php
-
-namespace Combodo\iTop\Test\UnitTest\Setup;
-
-use ApplicationInstallSequencerFake;
-use DataAuditSequencerFake;
-use PHPParameters;
-use Combodo\iTop\Test\UnitTest\ItopTestCase;
-use SetupUtils;
-
-class StepSequencerTest extends ItopTestCase
-{
-	protected function setUp(): void
-	{
-		static::LoadRequiredItopFiles();
-
-		parent::setUp();
-
-		$this->RequireOnceItopFile('/setup/sequencers/ApplicationInstallSequencer.php');
-		$this->RequireOnceItopFile('/setup/sequencers/DataAuditSequencer.php');
-		$this->RequireOnceItopFile('/setup/parameters.class.inc.php');
-		$this->RequireOnceItopFile('/setup/setuputils.class.inc.php');
-		$this->RequireOnceItopFile('/setup/runtimeenv.class.inc.php');
-		require_once __DIR__.'/ApplicationInstallSequencerFake.php';
-		require_once __DIR__.'/DataAuditSequencerFake.php';
-	}
-
-	public function testApplicationInstallSequencer()
-	{
-		$oParams = new PHPParameters();
-		$aParams = [
-			'mode' => 'install',
-			'database' => [
-				'server' => 'server',
-				'user' => 'user',
-				'pwd' => 'pwd',
-				'name' => 'name',
-				'prefix' => 'prefix',
-				'db_tls_enabled' => 'db_tls_enabled',
-				'db_tls_ca' => 'db_tls_ca',
-				],
-			'application_path' => '',
-			'language' => '',
-			'graphviz_path' => '',
-			'source_dir' => '',
-		];
-		$oParams->LoadFromHash($aParams);
-
-		$oInstallSequencer = new ApplicationInstallSequencerFake($oParams);
-		$oInstallSequencer->ExecuteAllSteps();
-
-		$aStepSequence = [
-			'',
-			'copy',
-			'compile',
-			'db-schema',
-			'after-db-create',
-			'load-data',
-			'create-config',
-		];
-		$this->AssertStepsHistoryIs($aStepSequence, $oInstallSequencer);
-	}
-
-	public function testDataAuditSequencer()
-	{
-		$oParams = new PHPParameters();
-		$oParams->LoadFromHash([]);
-
-		$oInstallSequencer = new DataAuditSequencerFake($oParams);
-		$oInstallSequencer->ExecuteAllSteps();
-
-		$aStepSequence = [
-			'',
-			'compile',
-			'write-config',
-			'setup-audit',
-			'cleanup',
-		];
-		$this->AssertStepsHistoryIs($aStepSequence, $oInstallSequencer);
-	}
-
-	protected function AssertStepsHistoryIs($aExpectedStepSequence, $oSequencer)
-	{
-
-		$aHistory = $oSequencer->GetHistory();
-		$aStepSequence = [];
-		foreach ($aHistory as $aStep) {
-			$aStepSequence[] = $aStep['step'];
-		}
-		$this->assertEquals($aExpectedStepSequence, $aStepSequence, 'The step sequence should be '.implode(',', $aExpectedStepSequence));
-	}
-}
diff --git a/tests/php-unit-tests/unitary-tests/setup/sequencers/ApplicationInstallerSequencerTest.php b/tests/php-unit-tests/unitary-tests/setup/sequencers/ApplicationInstallerSequencerTest.php
new file mode 100644
index 000000000..4f904b55a
--- /dev/null
+++ b/tests/php-unit-tests/unitary-tests/setup/sequencers/ApplicationInstallerSequencerTest.php
@@ -0,0 +1,105 @@
+<?php
+
+namespace Combodo\iTop\Test\UnitTest\Setup\Sequencers;
+
+use ApplicationInstallSequencer;
+use Combodo\iTop\Test\UnitTest\ItopTestCase;
+use PHPParameters;
+use PHPUnit\Framework\TestCase;
+
+class ApplicationInstallerSequencerTest extends ItopTestCase
+{
+	protected function setUp(): void
+	{
+		static::LoadRequiredItopFiles();
+
+		parent::setUp();
+
+		$this->RequireOnceItopFile('/setup/sequencers/ApplicationInstallSequencer.php');
+		$this->RequireOnceItopFile('/setup/sequencers/DataAuditSequencer.php');
+		$this->RequireOnceItopFile('/setup/parameters.class.inc.php');
+		$this->RequireOnceItopFile('/setup/setuputils.class.inc.php');
+		$this->RequireOnceItopFile('/setup/runtimeenv.class.inc.php');
+	}
+
+	public function testFirstStep()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->exactly(2))->method('GetFinalEnv')
+			->willReturn('production');
+		$oSequencer = new ApplicationInstallSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep();
+		$aExpected = [
+			'status' => 1,
+		    'message' => '',
+		    'next-step' => 'log-parameters',
+		    'next-step-label' => 'Log parameters',
+		    'percentage-completed' => 0,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testAnyFailure()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->exactly(2))->method('GetFinalEnv')
+			->willReturn('production');
+		$oRunTimeEnvironment->expects($this->once())->method('GetBuildEnv')
+			->willThrowException(new \CoreException('SHADOK MSG'));
+		$oSequencer = new ApplicationInstallSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('db-schema');
+		$aExpected = [
+			'status' => 2,
+			'message' => 'SHADOK MSG',
+			'next-step' => '',
+			'next-step-label' => '',
+			'percentage-completed' => 100,
+			'error_code' => 0,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testUnknownStep()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->exactly(2))->method('GetFinalEnv')
+			->willReturn('production');
+		$oSequencer = new ApplicationInstallSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('gabuzomeu');
+		$aExpected = [
+			'status' => 2,
+			'message' => '',
+			'next-step' => '',
+			'next-step-label' => 'Unknown setup step \'gabuzomeu\'.',
+			'percentage-completed' => 100,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	private function GivenParams(array $aAdditionalParams = []): PHPParameters
+	{
+		$oParams = new PHPParameters();
+		$aParams = array_merge([
+			'mode' => 'install',
+			'database' => [
+				'server' => 'server',
+				'user' => 'user',
+				'pwd' => 'pwd',
+				'name' => 'name',
+				'prefix' => 'prefix',
+				'db_tls_enabled' => 'db_tls_enabled',
+				'db_tls_ca' => 'db_tls_ca',
+			],
+			'application_path' => '',
+			'language' => '',
+			'graphviz_path' => '',
+			'source_dir' => '',
+		], $aAdditionalParams);
+
+		$oParams->LoadFromHash($aParams);
+		return $oParams;
+	}
+}
diff --git a/tests/php-unit-tests/unitary-tests/setup/sequencers/DataAuditSequencerTest.php b/tests/php-unit-tests/unitary-tests/setup/sequencers/DataAuditSequencerTest.php
new file mode 100644
index 000000000..be30c8ac0
--- /dev/null
+++ b/tests/php-unit-tests/unitary-tests/setup/sequencers/DataAuditSequencerTest.php
@@ -0,0 +1,200 @@
+<?php
+
+namespace Combodo\iTop\Test\UnitTest\Setup\Sequencers;
+
+use Combodo\iTop\Test\UnitTest\ItopTestCase;
+use DataAuditSequencer;
+use PHPParameters;
+use PHPUnit\Framework\TestCase;
+
+class DataAuditSequencerTest extends ItopTestCase
+{
+	protected function setUp(): void
+	{
+		static::LoadRequiredItopFiles();
+
+		parent::setUp();
+
+		$this->RequireOnceItopFile('/setup/sequencers/ApplicationInstallSequencer.php');
+		$this->RequireOnceItopFile('/setup/sequencers/DataAuditSequencer.php');
+		$this->RequireOnceItopFile('/setup/parameters.class.inc.php');
+		$this->RequireOnceItopFile('/setup/setuputils.class.inc.php');
+		$this->RequireOnceItopFile('/setup/runtimeenv.class.inc.php');
+	}
+
+	public function testDataAuditFirstStep()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->never())->method($this->anything());
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep();
+		$aExpected = [
+			'status' => 1,
+			'message' => '',
+			'next-step' => 'copy',
+			'next-step-label' => 'Copying data model files',
+			'percentage-completed' => 5,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testDataUnknownStep()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->never())->method($this->anything());
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('gabuzomeu');
+		$aExpected = [
+			'status' => 2,
+			'message' => '',
+			'next-step' => '',
+			'next-step-label' => 'Unknown setup step \'gabuzomeu\'.',
+			'percentage-completed' => 100,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testCopy()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->once())->method('CopySetupFiles');
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('copy');
+		$aExpected = [
+			'status' => 1,
+			'message' => 'Copying...',
+			'next-step' => 'compile',
+			'next-step-label' => 'Compiling the data model',
+			'percentage-completed' => 20,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testCompile()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->once())->method('DoCompile');
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('compile');
+		$aExpected = [
+			'status' => 1,
+			'message' => 'Using symbolic links instead of copying data model files (for developers only!)',
+			'next-step' => 'setup-audit',
+			'next-step-label' => 'Checking data consistency with the new data model',
+			'percentage-completed' => 70,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testCompileFailure()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->once())->method('DoCompile')
+			->willThrowException(new \CoreException('SHADOK MSG'));
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('compile');
+		$aExpected = [
+			'status' => 2,
+			'message' => 'SHADOK MSG',
+			'next-step' => '',
+			'next-step-label' => '',
+			'percentage-completed' => 100,
+			'error_code' => 0,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testAuditCalled()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->once())->method('DataToCleanupAudit');
+		$oRunTimeEnvironment->expects($this->once())->method('GetFinalEnv')
+			->willReturn('production');
+
+		$aAdditionalParams = [
+			'mode' => 'update',
+		];
+		$oSequencer = new DataAuditSequencer($this->GivenParams($aAdditionalParams), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('setup-audit');
+		$aExpected = [
+			'status' => 1,
+			'message' => '',
+			'next-step' => '',
+			'next-step-label' => 'Completed',
+			'percentage-completed' => 100,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testNoAuditInUpgradeModeWhenNoRuntimeEnvironmentAvailable()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->never())->method('DataToCleanupAudit');
+		$oRunTimeEnvironment->expects($this->once())->method('GetFinalEnv')
+			->willReturn('gabuzomeu');
+
+		$aAdditionalParams = [
+			'mode' => 'update',
+		];
+		$oSequencer = new DataAuditSequencer($this->GivenParams($aAdditionalParams), $oRunTimeEnvironment);
+		$aRes = $oSequencer->ExecuteStep('setup-audit');
+		$aExpected = [
+			'status' => 1,
+			'message' => '',
+			'next-step' => '',
+			'next-step-label' => 'Completed',
+			'percentage-completed' => 100,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	public function testNoAuditInFreshInstallMode()
+	{
+		$oRunTimeEnvironment = $this->createMock(\RunTimeEnvironment::class);
+		$oRunTimeEnvironment->expects($this->never())->method('GetFinalEnv')
+			->willReturn('gabuzomeu');
+		$oRunTimeEnvironment->expects($this->never())->method('DataToCleanupAudit');
+
+		$oSequencer = new DataAuditSequencer($this->GivenParams(), $oRunTimeEnvironment);
+
+		$aRes = $oSequencer->ExecuteStep('setup-audit');
+		$aExpected = [
+			'status' => 1,
+			'message' => '',
+			'next-step' => '',
+			'next-step-label' => 'Completed',
+			'percentage-completed' => 100,
+		];
+		$this->assertEquals($aExpected, $aRes);
+	}
+
+	private function GivenParams(array $aAdditionalParams = []): PHPParameters
+	{
+		$oParams = new PHPParameters();
+		$aParams = array_merge([
+			'mode' => 'install',
+			'database' => [
+				'server' => 'server',
+				'user' => 'user',
+				'pwd' => 'pwd',
+				'name' => 'name',
+				'prefix' => 'prefix',
+				'db_tls_enabled' => 'db_tls_enabled',
+				'db_tls_ca' => 'db_tls_ca',
+			],
+			'application_path' => '',
+			'language' => '',
+			'graphviz_path' => '',
+			'source_dir' => '',
+		], $aAdditionalParams);
+
+		$oParams->LoadFromHash($aParams);
+		return $oParams;
+	}
+}