libavr_format_test()

# The example's size is stated in the README, per chip, and a library advance
# that moves it silently is what this catches.
if(LIBAVR_MCU STREQUAL "atmega328p")
	libavr_size_claim_test(clock 1480)
elseif(LIBAVR_MCU STREQUAL "attiny85")
	libavr_size_claim_test(clock 1238)
endif()

# The README says the two modes emit the same image, and only a tree with
# both built can say whether they do.
libavr_mode_identity_test(clock)

# The battery is a compile: a static_assert that fails is the failure. It is a
# target rather than only a ctest so a plain build catches a regression too.
add_library(consteval_tests OBJECT consteval.cpp)
target_link_libraries(consteval_tests PRIVATE ds3231)

add_test(NAME ds3231.consteval
         COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target consteval_tests)