The list of potentially relevant files is: logical_rewriter_optimizer_test, physical_rewriter_optimizer_test, optimizer_test, path_optimizer_test, interval_intersection_test, and sbe_abt_diff_test.

These tests all serialize an ABT after some optimizations or serialize query results and then do string comparison. So, they are good candidates for converting to some other format. Maybe some tests should be converted to jstests (golden or otherwise), and some other tests should be converted to golden unit tests.