add_test_environment_wrapper.cmake

# Redefine add_test to set the LLVM_PROFILE_FILE environment variable
# on each test
function(add_test)
  _add_test(${ARGN})
  
  # There are two signatures to the add_test function to handle
  if(ARGV0 STREQUAL "NAME")
    set(TEST_NAME "${ARGV1}")
  else()
    set(TEST_NAME "${ARGV0}")
  endif()
  
  # Set the environment on the test
  set_tests_properties(
    "${TEST_NAME}"
    PROPERTIES ENVIRONMENT
    "LLVM_PROFILE_FILE=${PROJECT_BINARY_DIR}/coverage/cov-%m.profraw"
  )
endfunction(add_test)