diff --git a/include/common/test_helpers.h b/include/common/test_helpers.h
index 332f1d8..9031b34 100644
--- a/include/common/test_helpers.h
+++ b/include/common/test_helpers.h
@@ -10,6 +10,7 @@
 #include <arch_features.h>
 #include <ffa_svc.h>
 #include <plat_topology.h>
+#include <events.h>
 #include <psci.h>
 #include <spm_common.h>
 #include <tftf_lib.h>
@@ -341,4 +342,14 @@
 	uint32_t ffa_version_minor, const struct ffa_uuid *ffa_uuids,
 	size_t ffa_uuids_size);
 
+/**
+ * Turn on all cpus to execute a test in all.
+ * - 'cpu_on_handler' should have the code containing the test.
+ * - 'cpu_booted' is used for notifying which cores the test has been executed.
+ * This should be used in the test executed by cpu_on_handler at the end of
+ * processing to make sure it complies with this function's implementation.
+ */
+test_result_t spm_run_multi_core_test(uintptr_t cpu_on_handler,
+				      event_t *cpu_booted);
+
 #endif /* __TEST_HELPERS_H__ */