Revert "Simplify Exception expressions in CSTest"

This reverts commit b92b18b9b9bc90e3734652e5d6c5b217cd31bf39.

Reason for revert: Breaks the build because it removes an unused method that was used by a change intervening in the mean time

Bug: 136143444
Change-Id: Id3a17e0b16ec03276609ca96fb7b582188ed1077
1 file changed