Apply suggestion from @jordanschalm

Author: jordanschalm

AGENTS.md

@@ -62,4 +62,4 @@ grep "fun test" cadence/tests/interest_accrual_integration_test.cdc
 
 - Use string templating, not concatenation: `"Hello \(name)"` not `"Hello ".concat(name)`
 - Use `equalWithinVariance` from `test_helpers.cdc` for equality assertions where rounding errors are possible
-- Use red-green TDD for bug fixes and extensions to functionality
+- Use red-green TDD for bug fixes and extensions to functionality. Tests must use assertions (eg. `Test.assert`) to verify expected behaviour, not logs.