# Various list operations should treat non-existent variables as empty
# - APPEND
# - PREPEND
# - INSERT (only valid index is 0)
set(nex_l0 "")
list(APPEND nex_l0 a)
list(APPEND nex_l0 b)
if(NOT nex_l0 STREQUAL "a;b")
  message(FATAL_ERROR "a;b expected, got ${nex_l0}")
endif()

unset(nex_l1)
list(APPEND nex_l1 c)
list(APPEND nex_l1 d)
if(NOT nex_l1 STREQUAL "c;d")
  message(FATAL_ERROR "c;d expected, got ${nex_l1}")
endif()

set(nex_l2 "")
list(PREPEND nex_l2 E)
list(PREPEND nex_l2 f)
if(NOT nex_l2 STREQUAL "f;E")
  message(FATAL_ERROR "f;E expected, got ${nex_l2}")
endif()

unset(nex_l3)
list(PREPEND nex_l3 hi)
list(PREPEND nex_l3 G)
if(NOT nex_l3 STREQUAL "G;hi")
  message(FATAL_ERROR "G;hi expected, got ${nex_l3}")
endif()

set(nex_l4 "")
list(INSERT nex_l4 0 j)
list(INSERT nex_l4 0 kl)
if(NOT nex_l4 STREQUAL "kl;j")
  message(FATAL_ERROR "kl;j expected, got ${nex_l4}")
endif()

unset(nex_l5)
list(INSERT nex_l5 0 M)
list(INSERT nex_l5 0 noP)
if(NOT nex_l5 STREQUAL "noP;M")
  message(FATAL_ERROR "noP;M expected, got ${nex_l5}")
endif()