diff --git a/tests/php-unit-tests/post-build-integration-tests/iTopModuleXmlInstallationChecklistTest.php b/tests/php-unit-tests/post-build-integration-tests/iTopModuleXmlInstallationChecklistTest.php
index cf90c2704f..b9b88a7ce3 100644
--- a/tests/php-unit-tests/post-build-integration-tests/iTopModuleXmlInstallationChecklistTest.php
+++ b/tests/php-unit-tests/post-build-integration-tests/iTopModuleXmlInstallationChecklistTest.php
@@ -52,22 +52,27 @@ class iTopModuleXmlInstallationChecklistTest extends ItopTestCase
 			}
 		}
 
-		$aFilteredModulesFromDatamodels = $this->GetFilteredModulesFromDatamodels(APPROOT.'/datamodels');
-		$this->assertCount(
-			0,
-			array_diff($aFilteredModulesFromDatamodels, array_intersect($aFilteredModulesFromDatamodels, $aDeclaredModules)),
-			"{$sInstallationXmlPath} does not list all modules in /datamodels ! List of modules in installation.xml:\n ".var_export($aDeclaredModules, true)
-		);
+		$aIssues = [];
+
+		$aFilteredModulesFromDatamodels = $this->GetModulesNotAutoSelected(APPROOT.'/datamodels');
+		$aMissingModules = array_diff($aFilteredModulesFromDatamodels, $aDeclaredModules);
+		$sMissingModules = implode(', ', $aMissingModules);
+		if (count($aMissingModules) > 0) {
+			$aIssues[] = "Does not reference the following modules: {$sMissingModules}. Those modules are in the directory datamodels and they are not configured for automatic installation. They will never be installed in this package.";
+		}
 
 		$aModulesFromDatamodels = $this->GetAllModules(APPROOT.'/datamodels');
-		$this->assertCount(
-			0,
-			array_diff($aDeclaredModules, array_intersect($aDeclaredModules, $aModulesFromDatamodels)),
-			"Not all modules are contained in {$sInstallationXmlPath}. List of modules in /datamodels:\n ".var_export($aModulesFromDatamodels, true)
-		);
+		$aMissingModules = array_diff($aDeclaredModules, $aModulesFromDatamodels);
+		$sMissingModules = implode(', ', $aMissingModules);
+		if (count($aMissingModules) > 0) {
+			$aIssues[] = "References unknown modules: $sMissingModules. Those modules are not in the datamodels directory. This will prevent the installation of the package.";
+		}
+		if (count($aIssues) > 0) {
+			$this->fail("Encountered ".count($aIssues)." issue(s) in {$sInstallationXmlPath}:\n- ".implode("\n- ", $aIssues));
+		}
 	}
 
-	public function GetFilteredModulesFromDatamodels($sFolder)
+	public function GetModulesNotAutoSelected($sFolder)
 	{
 		$aExcludedModules = ['authent-external', 'authent-ldap'];
 		$aModules = array();
@@ -78,7 +83,7 @@ class iTopModuleXmlInstallationChecklistTest extends ItopTestCase
 				if (is_dir($sPath))
 				{
 					/** @noinspection SlowArrayOperationsInLoopInspection */
-					$aModules = array_merge($aModules, $this->GetFilteredModulesFromDatamodels($sPath));
+					$aModules = array_merge($aModules, $this->GetModulesNotAutoSelected($sPath));
 				}
 				else if (preg_match("/module\..*\.php/", basename($sPath)))
 				{