updates for using {fmt} and reordering of include statements exposing hidden includes

set(TEST_INPUT_FOLDER ${CMAKE_CURRENT_SOURCE_DIR}/tests)

add_library(style_tests STATIC yaml_writer.cpp error_stats.cpp test_config_reader.cpp test_main.cpp)

target_compile_definitions(style_tests PRIVATE TEST_INPUT_FOLDER=${TEST_INPUT_FOLDER})

target_include_directories(style_tests PRIVATE ${LAMMPS_SOURCE_DIR})

target_link_libraries(style_tests PUBLIC GTest::GTest GTest::GMock Yaml::Yaml)

if(BUILD_MPI)

  target_link_libraries(style_tests PUBLIC MPI::MPI_CXX)

# unit test for error stats class

add_executable(test_error_stats test_error_stats.cpp)

target_include_directories(test_error_stats PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${LAMMPS_SOURCE_DIR})

target_link_libraries(test_error_stats PRIVATE GTest::GTestMain GTest::GTest)

add_test(NAME ErrorStats COMMAND test_error_stats)

#ifndef TEST_CONFIG_READER_H

#define TEST_CONFIG_READER_H

#include "test_config.h"

#include "yaml_reader.h"

class TestConfigReader : public YamlReader<TestConfigReader> {