diff --git a/test/run b/test/run
index 46a2d01..ed43e3a 100755
--- a/test/run
+++ b/test/run
@@ -1,4 +1,8 @@
-#! /bin/bash
+#! /bin/sh
+set -eu
+
 # This is the expected entry point for Cockpit CI; will be called without
-# arguments but with an appropriate $TEST_OS
+# arguments but with an appropriate $TEST_OS, and optionally $TEST_SCENARIO
+
+[ -z "${TEST_SCENARIO:-}" ] || export TEST_BROWSER="$TEST_SCENARIO"
 make check