They measure duration risk on short term assets but not long term assets like SVBs bonds which are (for better or worse) classified under different rules that allow them to be held to maturity without needing to account for mark-to-market losses for capital assessment purposes.
As a result stress tests which measure various interest rate scenarios, deposit withdrawals and increased bad debt ratios aren't overly affected by these long duration bonds.
That is all good and well as long as these assets truly are held to maturity and forced selling doesn't take place.
Then again, maybe it's fine. These tests are meant to ensure the banks can handle changing economic conditions. They aren't meant to be able to protect banks against a bank run of this scale.
As a result stress tests which measure various interest rate scenarios, deposit withdrawals and increased bad debt ratios aren't overly affected by these long duration bonds.
That is all good and well as long as these assets truly are held to maturity and forced selling doesn't take place.
Then again, maybe it's fine. These tests are meant to ensure the banks can handle changing economic conditions. They aren't meant to be able to protect banks against a bank run of this scale.