diff --git a/tests/run.sh b/tests/run.sh
index da6eb88..f139105 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -61,7 +61,7 @@ source "run_syntax_check.sh"
 
 source "run_coding_standards_check.sh"
 
-source "run_phpunit.sh"
+source "run_phpunit.sh" "$@"
 
 source "run_static_analysis_check_phpstan.sh"
 
diff --git a/tests/run_phpunit.sh b/tests/run_phpunit.sh
index 46d1e1c..4910c0a 100755
--- a/tests/run_phpunit.sh
+++ b/tests/run_phpunit.sh
@@ -115,6 +115,10 @@ elif [[ "${phpunit_version}" == "11."* ]]; then
 elif [[ "${phpunit_version}" == "12."* ]]; then
     phpunit_v12_shim
     phpunit_args=" --display-incomplete --display-skipped --display-deprecations --display-errors --display-notices --display-warnings --fail-on-risky ${extra_args}"
+else
+    echo "❌ Error: unhandled phpunit version: ${phpunit_version}"
+    errors+=("unhandled phpunit version: ${phpunit_version}")
+    exit 1
 fi
 
 # Run tests.