Write documentation for TEST_ASSERT
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 1255ff4..269cdad 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -97,6 +97,14 @@
* This macro is not suitable for negative parameter validation tests,
* as it assumes the test step will not create an error.
*
+ * Failing the test means:
+ * - Mark this test case as failed.
+ * - Print a message identifying the failure.
+ * - Jump to the \c exit label.
+ *
+ * This macro expands to an instruction, not an expression.
+ * It may jump to the \c exit label.
+ *
* \param TEST The test expression to be tested.
*/
#define TEST_ASSERT( TEST ) \