A test socket for facilitating testing of a device under test (DUT) includes a holder comprising a mounting structure for attaching the holder to other components of the socket and a floating nest structure in which the DUT can be disposed. The floating nest structure can have a seat cavity sized and shaped to receive and hold the DUT such that at least some of the DUT terminals are in contact with corresponding contacts of a test board while the test socket is attached to the test board. A flexure located laterally between the mounting structure and the floating nest structure and can allow the nest structure to move relative to the mounting structure and thus float.