GoogleTest: Improve internally used variable names

- Use an "arg" prefix for cmake_parse_arguments() rather than
  an empty string or uppercase ARGS so that usages of parsed
  values don't start with a bare underscore or look fully
  uppercase. This makes it harder to miss them or mistake
  them for keywords.
- Use lowercase for names of positional function arguments
  so they don't get mistaken for keywords.

2 files changed, 151 insertions, 119 deletions

diff --git a/Modules/GoogleTest.cmake b/Modules/GoogleTest.cmake
index 2c909cf..b959c53 100644
--- a/Modules/GoogleTest.cmake
+++ b/Modules/GoogleTest.cmake
@@ -314,35 +314,35 @@ function(gtest_add_tests)
 
   unset(sources)
   if("${ARGV0}" IN_LIST allKeywords)
-    cmake_parse_arguments(ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+    cmake_parse_arguments(arg "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
     set(autoAddSources YES)
   else()
     # Non-keyword syntax, convert to keyword form
     if (ARGC LESS 3)
       message(FATAL_ERROR "gtest_add_tests() without keyword options requires at least 3 arguments")
     endif()
-    set(ARGS_TARGET     "${ARGV0}")
-    set(ARGS_EXTRA_ARGS "${ARGV1}")
+    set(arg_TARGET     "${ARGV0}")
+    set(arg_EXTRA_ARGS "${ARGV1}")
     if(NOT "${ARGV2}" STREQUAL "AUTO")
-      set(ARGS_SOURCES "${ARGV}")
-      list(REMOVE_AT ARGS_SOURCES 0 1)
+      set(arg_SOURCES "${ARGV}")
+      list(REMOVE_AT arg_SOURCES 0 1)
     endif()
   endif()
 
   # The non-keyword syntax allows the first argument to be an arbitrary
   # executable rather than a target if source files are also provided. In all
   # other cases, both forms require a target.
-  if(NOT TARGET "${ARGS_TARGET}" AND NOT ARGS_SOURCES)
-    message(FATAL_ERROR "${ARGS_TARGET} does not define an existing CMake target")
+  if(NOT TARGET "${arg_TARGET}" AND NOT arg_SOURCES)
+    message(FATAL_ERROR "${arg_TARGET} does not define an existing CMake target")
   endif()
-  if(NOT ARGS_WORKING_DIRECTORY)
+  if(NOT arg_WORKING_DIRECTORY)
     unset(workDir)
   else()
-    set(workDir WORKING_DIRECTORY "${ARGS_WORKING_DIRECTORY}")
+    set(workDir WORKING_DIRECTORY "${arg_WORKING_DIRECTORY}")
   endif()
 
-  if(NOT ARGS_SOURCES)
-    get_property(ARGS_SOURCES TARGET ${ARGS_TARGET} PROPERTY SOURCES)
+  if(NOT arg_SOURCES)
+    get_property(arg_SOURCES TARGET ${arg_TARGET} PROPERTY SOURCES)
   endif()
 
   unset(testList)
@@ -351,8 +351,8 @@ function(gtest_add_tests)
   set(gtest_test_type_regex "(TYPED_TEST|TEST)_?[FP]?")
   set(each_line_regex "([^\r\n]*[\r\n])")
 
-  foreach(source IN LISTS ARGS_SOURCES)
-    if(NOT ARGS_SKIP_DEPENDENCY)
+  foreach(source IN LISTS arg_SOURCES)
+    if(NOT arg_SKIP_DEPENDENCY)
       set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${source})
     endif()
     file(READ "${source}" contents)
@@ -420,26 +420,26 @@ function(gtest_add_tests)
                  orig_test_name "${gtest_test_name}"
           )
           set(ctest_test_name
-              ${ARGS_TEST_PREFIX}${orig_test_name}${ARGS_TEST_SUFFIX}
+              ${arg_TEST_PREFIX}${orig_test_name}${arg_TEST_SUFFIX}
           )
           add_test(NAME ${ctest_test_name}
                    ${workDir}
-                   COMMAND ${ARGS_TARGET}
+                   COMMAND ${arg_TARGET}
                      --gtest_also_run_disabled_tests
                      --gtest_filter=${gtest_test_name}
-                     ${ARGS_EXTRA_ARGS}
+                     ${arg_EXTRA_ARGS}
           )
           set_tests_properties(${ctest_test_name} PROPERTIES DISABLED TRUE
             DEF_SOURCE_LINE "${source}:${accumulate_line}")
           list(APPEND testList ${ctest_test_name})
         endif()
       else()
-        set(ctest_test_name ${ARGS_TEST_PREFIX}${gtest_test_name}${ARGS_TEST_SUFFIX})
+        set(ctest_test_name ${arg_TEST_PREFIX}${gtest_test_name}${arg_TEST_SUFFIX})
         add_test(NAME ${ctest_test_name}
                  ${workDir}
-                 COMMAND ${ARGS_TARGET}
+                 COMMAND ${arg_TARGET}
                    --gtest_filter=${gtest_test_name}
-                   ${ARGS_EXTRA_ARGS}
+                   ${arg_EXTRA_ARGS}
         )
         # Makes sure a skipped GTest is reported as so by CTest
         set_tests_properties(
@@ -453,49 +453,64 @@ function(gtest_add_tests)
     endforeach()
   endforeach()
 
-  if(ARGS_TEST_LIST)
-    set(${ARGS_TEST_LIST} ${testList} PARENT_SCOPE)
+  if(arg_TEST_LIST)
+    set(${arg_TEST_LIST} ${testList} PARENT_SCOPE)
   endif()
 
 endfunction()
 
 #------------------------------------------------------------------------------
 
-function(gtest_discover_tests TARGET)
-  cmake_parse_arguments(
-    ""
-    "NO_PRETTY_TYPES;NO_PRETTY_VALUES"
-    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;DISCOVERY_TIMEOUT;XML_OUTPUT_DIR;DISCOVERY_MODE"
-    "EXTRA_ARGS;PROPERTIES;TEST_FILTER"
+function(gtest_discover_tests target)
+  set(options
+    NO_PRETTY_TYPES
+    NO_PRETTY_VALUES
+  )
+  set(oneValueArgs
+    TEST_PREFIX
+    TEST_SUFFIX
+    WORKING_DIRECTORY
+    TEST_LIST
+    DISCOVERY_TIMEOUT
+    XML_OUTPUT_DIR
+    DISCOVERY_MODE
+  )
+  set(multiValueArgs
+    EXTRA_ARGS
+    PROPERTIES
+    TEST_FILTER
+  )
+  cmake_parse_arguments(arg
+    "${options}" "${oneValueArgs}" "${multiValueArgs}"
     ${ARGN}
   )
 
-  if(NOT _WORKING_DIRECTORY)
-    set(_WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+  if(NOT arg_WORKING_DIRECTORY)
+    set(arg_WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
   endif()
-  if(NOT _TEST_LIST)
-    set(_TEST_LIST ${TARGET}_TESTS)
+  if(NOT arg_TEST_LIST)
+    set(arg_TEST_LIST ${target}_TESTS)
   endif()
-  if(NOT _DISCOVERY_TIMEOUT)
-    set(_DISCOVERY_TIMEOUT 5)
+  if(NOT arg_DISCOVERY_TIMEOUT)
+    set(arg_DISCOVERY_TIMEOUT 5)
   endif()
-  if(NOT _DISCOVERY_MODE)
+  if(NOT arg_DISCOVERY_MODE)
     if(NOT CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE)
       set(CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE "POST_BUILD")
     endif()
-    set(_DISCOVERY_MODE ${CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE})
+    set(arg_DISCOVERY_MODE ${CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE})
   endif()
 
   get_property(
     has_counter
-    TARGET ${TARGET}
+    TARGET ${target}
     PROPERTY CTEST_DISCOVERED_TEST_COUNTER
     SET
   )
   if(has_counter)
     get_property(
       counter
-      TARGET ${TARGET}
+      TARGET ${target}
       PROPERTY CTEST_DISCOVERED_TEST_COUNTER
     )
     math(EXPR counter "${counter} + 1")
@@ -503,17 +518,17 @@ function(gtest_discover_tests TARGET)
     set(counter 1)
   endif()
   set_property(
-    TARGET ${TARGET}
+    TARGET ${target}
     PROPERTY CTEST_DISCOVERED_TEST_COUNTER
     ${counter}
   )
 
   # Define rule to generate test list for aforementioned test executable
-  set(ctest_file_base "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}[${counter}]")
+  set(ctest_file_base "${CMAKE_CURRENT_BINARY_DIR}/${target}[${counter}]")
   set(ctest_include_file "${ctest_file_base}_include.cmake")
   set(ctest_tests_file "${ctest_file_base}_tests.cmake")
   get_property(test_launcher
-    TARGET ${TARGET}
+    TARGET ${target}
     PROPERTY TEST_LAUNCHER
   )
   cmake_policy(GET CMP0158 _CMP0158
@@ -521,7 +536,7 @@ function(gtest_discover_tests TARGET)
   )
   if(NOT _CMP0158 OR _CMP0158 STREQUAL "OLD" OR _CMP0158 STREQUAL "NEW" AND CMAKE_CROSSCOMPILING)
     get_property(crosscompiling_emulator
-      TARGET ${TARGET}
+      TARGET ${target}
       PROPERTY CROSSCOMPILING_EMULATOR
     )
   endif()
@@ -536,26 +551,26 @@ function(gtest_discover_tests TARGET)
     set(test_executor "")
   endif()
 
-  if(_DISCOVERY_MODE STREQUAL "POST_BUILD")
+  if(arg_DISCOVERY_MODE STREQUAL "POST_BUILD")
     add_custom_command(
-      TARGET ${TARGET} POST_BUILD
+      TARGET ${target} POST_BUILD
       BYPRODUCTS "${ctest_tests_file}"
       COMMAND "${CMAKE_COMMAND}"
-              -D "TEST_TARGET=${TARGET}"
-              -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
+              -D "TEST_TARGET=${target}"
+              -D "TEST_EXECUTABLE=$<TARGET_FILE:${target}>"
               -D "TEST_EXECUTOR=${test_executor}"
-              -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
-              -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
-              -D "TEST_PROPERTIES=${_PROPERTIES}"
-              -D "TEST_PREFIX=${_TEST_PREFIX}"
-              -D "TEST_SUFFIX=${_TEST_SUFFIX}"
-              -D "TEST_FILTER=${_TEST_FILTER}"
-              -D "NO_PRETTY_TYPES=${_NO_PRETTY_TYPES}"
-              -D "NO_PRETTY_VALUES=${_NO_PRETTY_VALUES}"
-              -D "TEST_LIST=${_TEST_LIST}"
+              -D "TEST_WORKING_DIR=${arg_WORKING_DIRECTORY}"
+              -D "TEST_EXTRA_ARGS=${arg_EXTRA_ARGS}"
+              -D "TEST_PROPERTIES=${arg_PROPERTIES}"
+              -D "TEST_PREFIX=${arg_TEST_PREFIX}"
+              -D "TEST_SUFFIX=${arg_TEST_SUFFIX}"
+              -D "TEST_FILTER=${arg_TEST_FILTER}"
+              -D "NO_PRETTY_TYPES=${arg_NO_PRETTY_TYPES}"
+              -D "NO_PRETTY_VALUES=${arg_NO_PRETTY_VALUES}"
+              -D "TEST_LIST=${arg_TEST_LIST}"
               -D "CTEST_FILE=${ctest_tests_file}"
-              -D "TEST_DISCOVERY_TIMEOUT=${_DISCOVERY_TIMEOUT}"
-              -D "TEST_XML_OUTPUT_DIR=${_XML_OUTPUT_DIR}"
+              -D "TEST_DISCOVERY_TIMEOUT=${arg_DISCOVERY_TIMEOUT}"
+              -D "TEST_XML_OUTPUT_DIR=${arg_XML_OUTPUT_DIR}"
               -P "${CMAKE_ROOT}/Modules/GoogleTestAddTests.cmake"
       VERBATIM
     )
@@ -564,10 +579,10 @@ function(gtest_discover_tests TARGET)
       "if(EXISTS \"${ctest_tests_file}\")\n"
       "  include(\"${ctest_tests_file}\")\n"
       "else()\n"
-      "  add_test(${TARGET}_NOT_BUILT ${TARGET}_NOT_BUILT)\n"
+      "  add_test(${target}_NOT_BUILT ${target}_NOT_BUILT)\n"
       "endif()\n"
     )
-  elseif(_DISCOVERY_MODE STREQUAL "PRE_TEST")
+  elseif(arg_DISCOVERY_MODE STREQUAL "PRE_TEST")
 
     get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL
         PROPERTY GENERATOR_IS_MULTI_CONFIG
@@ -578,31 +593,31 @@ function(gtest_discover_tests TARGET)
     endif()
 
     string(CONCAT ctest_include_content
-      "if(EXISTS \"$<TARGET_FILE:${TARGET}>\")"                                    "\n"
+      "if(EXISTS \"$<TARGET_FILE:${target}>\")"                                    "\n"
       "  if(NOT EXISTS \"${ctest_tests_file}\" OR"                                 "\n"
-      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"$<TARGET_FILE:${TARGET}>\" OR\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"$<TARGET_FILE:${target}>\" OR\n"
       "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"\${CMAKE_CURRENT_LIST_FILE}\")\n"
       "    include(\"${CMAKE_ROOT}/Modules/GoogleTestAddTests.cmake\")"            "\n"
       "    gtest_discover_tests_impl("                                             "\n"
-      "      TEST_EXECUTABLE"        " [==[$<TARGET_FILE:${TARGET}>]==]"           "\n"
+      "      TEST_EXECUTABLE"        " [==[$<TARGET_FILE:${target}>]==]"           "\n"
       "      TEST_EXECUTOR"          " [==[${test_executor}]==]"                   "\n"
-      "      TEST_WORKING_DIR"       " [==[${_WORKING_DIRECTORY}]==]"              "\n"
-      "      TEST_EXTRA_ARGS"        " [==[${_EXTRA_ARGS}]==]"                     "\n"
-      "      TEST_PROPERTIES"        " [==[${_PROPERTIES}]==]"                     "\n"
-      "      TEST_PREFIX"            " [==[${_TEST_PREFIX}]==]"                    "\n"
-      "      TEST_SUFFIX"            " [==[${_TEST_SUFFIX}]==]"                    "\n"
-      "      TEST_FILTER"            " [==[${_TEST_FILTER}]==]"                    "\n"
-      "      NO_PRETTY_TYPES"        " [==[${_NO_PRETTY_TYPES}]==]"                "\n"
-      "      NO_PRETTY_VALUES"       " [==[${_NO_PRETTY_VALUES}]==]"               "\n"
-      "      TEST_LIST"              " [==[${_TEST_LIST}]==]"                      "\n"
+      "      TEST_WORKING_DIR"       " [==[${arg_WORKING_DIRECTORY}]==]"           "\n"
+      "      TEST_EXTRA_ARGS"        " [==[${arg_EXTRA_ARGS}]==]"                  "\n"
+      "      TEST_PROPERTIES"        " [==[${arg_PROPERTIES}]==]"                  "\n"
+      "      TEST_PREFIX"            " [==[${arg_TEST_PREFIX}]==]"                 "\n"
+      "      TEST_SUFFIX"            " [==[${arg_TEST_SUFFIX}]==]"                 "\n"
+      "      TEST_FILTER"            " [==[${arg_TEST_FILTER}]==]"                 "\n"
+      "      NO_PRETTY_TYPES"        " [==[${arg_NO_PRETTY_TYPES}]==]"             "\n"
+      "      NO_PRETTY_VALUES"       " [==[${arg_NO_PRETTY_VALUES}]==]"            "\n"
+      "      TEST_LIST"              " [==[${arg_TEST_LIST}]==]"                   "\n"
       "      CTEST_FILE"             " [==[${ctest_tests_file}]==]"                "\n"
-      "      TEST_DISCOVERY_TIMEOUT" " [==[${_DISCOVERY_TIMEOUT}]==]"              "\n"
-      "      TEST_XML_OUTPUT_DIR"    " [==[${_XML_OUTPUT_DIR}]==]"                 "\n"
+      "      TEST_DISCOVERY_TIMEOUT" " [==[${arg_DISCOVERY_TIMEOUT}]==]"           "\n"
+      "      TEST_XML_OUTPUT_DIR"    " [==[${arg_XML_OUTPUT_DIR}]==]"              "\n"
       "    )"                                                                      "\n"
       "  endif()"                                                                  "\n"
       "  include(\"${ctest_tests_file}\")"                                         "\n"
       "else()"                                                                     "\n"
-      "  add_test(${TARGET}_NOT_BUILT ${TARGET}_NOT_BUILT)"                        "\n"
+      "  add_test(${target}_NOT_BUILT ${target}_NOT_BUILT)"                        "\n"
       "endif()"                                                                    "\n"
     )
 
@@ -628,7 +643,7 @@ function(gtest_discover_tests TARGET)
     endif()
 
   else()
-    message(FATAL_ERROR "Unknown DISCOVERY_MODE: ${_DISCOVERY_MODE}")
+    message(FATAL_ERROR "Unknown DISCOVERY_MODE: ${arg_DISCOVERY_MODE}")
   endif()
 
   # Add discovered tests to directory TEST_INCLUDE_FILES
diff --git a/Modules/GoogleTestAddTests.cmake b/Modules/GoogleTestAddTests.cmake
index dc1cc7d..b654bb0 100644
--- a/Modules/GoogleTestAddTests.cmake
+++ b/Modules/GoogleTestAddTests.cmake
@@ -3,12 +3,12 @@
 
 cmake_minimum_required(VERSION 3.30)
 
-# Overwrite possibly existing ${_CTEST_FILE} with empty file
+# Overwrite possibly existing ${arg_CTEST_FILE} with empty file
 set(flush_tests_MODE WRITE)
 
-# Flushes script to ${_CTEST_FILE}
+# Flushes script to ${arg_CTEST_FILE}
 macro(flush_script)
-  file(${flush_tests_MODE} "${_CTEST_FILE}" "${script}")
+  file(${flush_tests_MODE} "${arg_CTEST_FILE}" "${script}")
   set(flush_tests_MODE APPEND PARENT_SCOPE)
 
   set(script "")
@@ -20,7 +20,7 @@ macro(flush_tests_buffer)
   set(tests_buffer "")
 endmacro()
 
-function(add_command NAME TEST_NAME)
+function(add_command name test_name)
   set(args "")
   foreach(arg ${ARGN})
     if(arg MATCHES "[^-./:a-zA-Z0-9_]")
@@ -29,7 +29,7 @@ function(add_command NAME TEST_NAME)
       string(APPEND args " ${arg}")
     endif()
   endforeach()
-  string(APPEND script "${NAME}(${TEST_NAME} ${args})\n")
+  string(APPEND script "${name}(${test_name} ${args})\n")
   string(LENGTH "${script}" script_len)
   if(${script_len} GREATER "50000")
     flush_script()
@@ -37,82 +37,98 @@ function(add_command NAME TEST_NAME)
   set(script "${script}" PARENT_SCOPE)
 endfunction()
 
-function(generate_testname_guards OUTPUT OPEN_GUARD_VAR CLOSE_GUARD_VAR)
+function(generate_testname_guards output open_guard_var close_guard_var)
   set(open_guard "[=[")
   set(close_guard "]=]")
   set(counter 1)
-  while("${OUTPUT}" MATCHES "${close_guard}")
+  while("${output}" MATCHES "${close_guard}")
     math(EXPR counter "${counter} + 1")
     string(REPEAT "=" ${counter} equals)
     set(open_guard "[${equals}[")
     set(close_guard "]${equals}]")
   endwhile()
-  set(${OPEN_GUARD_VAR} "${open_guard}" PARENT_SCOPE)
-  set(${CLOSE_GUARD_VAR} "${close_guard}" PARENT_SCOPE)
+  set(${open_guard_var} "${open_guard}" PARENT_SCOPE)
+  set(${close_guard_var} "${close_guard}" PARENT_SCOPE)
 endfunction()
 
-function(escape_square_brackets OUTPUT BRACKET PLACEHOLDER PLACEHOLDER_VAR OUTPUT_VAR)
-  if("${OUTPUT}" MATCHES "\\${BRACKET}")
-    set(placeholder "${PLACEHOLDER}")
-    while("${OUTPUT}" MATCHES "${placeholder}")
+function(escape_square_brackets output bracket placeholder placeholder_var output_var)
+  if("${output}" MATCHES "\\${bracket}")
+    set(placeholder "${placeholder}")
+    while("${output}" MATCHES "${placeholder}")
         set(placeholder "${placeholder}_")
     endwhile()
-    string(REPLACE "${BRACKET}" "${placeholder}" OUTPUT "${OUTPUT}")
-    set(${PLACEHOLDER_VAR} "${placeholder}" PARENT_SCOPE)
-    set(${OUTPUT_VAR} "${OUTPUT}" PARENT_SCOPE)
+    string(REPLACE "${bracket}" "${placeholder}" output "${output}")
+    set(${placeholder_var} "${placeholder}" PARENT_SCOPE)
+    set(${output_var} "${output}" PARENT_SCOPE)
   endif()
 endfunction()
 
 function(gtest_discover_tests_impl)
 
-  cmake_parse_arguments(
-    ""
-    ""
-    "NO_PRETTY_TYPES;NO_PRETTY_VALUES;TEST_EXECUTABLE;TEST_WORKING_DIR;TEST_PREFIX;TEST_SUFFIX;TEST_LIST;CTEST_FILE;TEST_DISCOVERY_TIMEOUT;TEST_XML_OUTPUT_DIR;TEST_FILTER"
-    "TEST_EXTRA_ARGS;TEST_PROPERTIES;TEST_EXECUTOR"
+  set(options )
+  set(oneValueArgs
+    NO_PRETTY_TYPES   # These two take a value, unlike gtest_discover_tests
+    NO_PRETTY_VALUES  #
+    TEST_EXECUTABLE
+    TEST_WORKING_DIR
+    TEST_PREFIX
+    TEST_SUFFIX
+    TEST_LIST
+    CTEST_FILE
+    TEST_DISCOVERY_TIMEOUT
+    TEST_XML_OUTPUT_DIR
+    TEST_FILTER   # This is a multi-value argument in gtest_discover_tests
+  )
+  set(multiValueArgs
+    TEST_EXTRA_ARGS
+    TEST_PROPERTIES
+    TEST_EXECUTOR
+  )
+  cmake_parse_arguments(arg
+    "${options}" "${oneValueArgs}" "${multiValueArgs}"
     ${ARGN}
   )
 
-  set(prefix "${_TEST_PREFIX}")
-  set(suffix "${_TEST_SUFFIX}")
-  set(extra_args ${_TEST_EXTRA_ARGS})
-  set(properties ${_TEST_PROPERTIES})
+  set(prefix "${arg_TEST_PREFIX}")
+  set(suffix "${arg_TEST_SUFFIX}")
+  set(extra_args ${arg_TEST_EXTRA_ARGS})
+  set(properties ${arg_TEST_PROPERTIES})
   set(script)
   set(suite)
   set(tests)
   set(tests_buffer)
 
-  if(_TEST_FILTER)
-    set(filter "--gtest_filter=${_TEST_FILTER}")
+  if(arg_TEST_FILTER)
+    set(filter "--gtest_filter=${arg_TEST_FILTER}")
   else()
     set(filter)
   endif()
 
   # Run test executable to get list of available tests
-  if(NOT EXISTS "${_TEST_EXECUTABLE}")
+  if(NOT EXISTS "${arg_TEST_EXECUTABLE}")
     message(FATAL_ERROR
       "Specified test executable does not exist.\n"
-      "  Path: '${_TEST_EXECUTABLE}'"
+      "  Path: '${arg_TEST_EXECUTABLE}'"
     )
   endif()
   execute_process(
-    COMMAND ${_TEST_EXECUTOR} "${_TEST_EXECUTABLE}" --gtest_list_tests ${filter}
-    WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
-    TIMEOUT ${_TEST_DISCOVERY_TIMEOUT}
+    COMMAND ${arg_TEST_EXECUTOR} "${arg_TEST_EXECUTABLE}" --gtest_list_tests ${filter}
+    WORKING_DIRECTORY "${arg_TEST_WORKING_DIR}"
+    TIMEOUT ${arg_TEST_DISCOVERY_TIMEOUT}
     OUTPUT_VARIABLE output
     RESULT_VARIABLE result
   )
   if(NOT ${result} EQUAL 0)
     string(REPLACE "\n" "\n    " output "${output}")
-    if(_TEST_EXECUTOR)
-      set(path "${_TEST_EXECUTOR} ${_TEST_EXECUTABLE}")
+    if(arg_TEST_EXECUTOR)
+      set(path "${arg_TEST_EXECUTOR} ${arg_TEST_EXECUTABLE}")
     else()
-      set(path "${_TEST_EXECUTABLE}")
+      set(path "${arg_TEST_EXECUTABLE}")
     endif()
     message(FATAL_ERROR
       "Error running test executable.\n"
       "  Path: '${path}'\n"
-      "  Working directory: '${_TEST_WORKING_DIR}'\n"
+      "  Working directory: '${arg_TEST_WORKING_DIR}'\n"
       "  Result: ${result}\n"
       "  Output:\n"
       "    ${output}\n"
@@ -136,7 +152,7 @@ function(gtest_discover_tests_impl)
         string(REGEX REPLACE "\\.( *#.*)?$" "" suite "${line}")
         if(line MATCHES "#")
           string(REGEX REPLACE "/[0-9].*" "" pretty_suite "${line}")
-          if(NOT _NO_PRETTY_TYPES)
+          if(NOT arg_NO_PRETTY_TYPES)
             string(REGEX REPLACE ".*/[0-9]+[ .#]+TypeParam = (.*)" "\\1" type_parameter "${line}")
           else()
             string(REGEX REPLACE ".*/([0-9]+)[ .#]+TypeParam = .*" "\\1" type_parameter "${line}")
@@ -149,15 +165,15 @@ function(gtest_discover_tests_impl)
         string(REGEX REPLACE "^DISABLED_" "" pretty_suite "${pretty_suite}")
       else()
         string(STRIP "${line}" test)
-        if(test MATCHES "#" AND NOT _NO_PRETTY_VALUES)
+        if(test MATCHES "#" AND NOT arg_NO_PRETTY_VALUES)
           string(REGEX REPLACE "/[0-9]+[ #]+GetParam\\(\\) = " "/" pretty_test "${test}")
         else()
           string(REGEX REPLACE " +#.*" "" pretty_test "${test}")
         endif()
         string(REGEX REPLACE "^DISABLED_" "" pretty_test "${pretty_test}")
         string(REGEX REPLACE " +#.*" "" test "${test}")
-        if(NOT "${_TEST_XML_OUTPUT_DIR}" STREQUAL "")
-          set(TEST_XML_OUTPUT_PARAM "--gtest_output=xml:${_TEST_XML_OUTPUT_DIR}/${prefix}${suite}.${test}${suffix}.xml")
+        if(NOT "${arg_TEST_XML_OUTPUT_DIR}" STREQUAL "")
+          set(TEST_XML_OUTPUT_PARAM "--gtest_output=xml:${arg_TEST_XML_OUTPUT_DIR}/${prefix}${suite}.${test}${suffix}.xml")
         else()
           unset(TEST_XML_OUTPUT_PARAM)
         endif()
@@ -175,8 +191,8 @@ function(gtest_discover_tests_impl)
         # add to script
         add_command(add_test
           "${guarded_testname}"
-          ${_TEST_EXECUTOR}
-          "${_TEST_EXECUTABLE}"
+          ${arg_TEST_EXECUTOR}
+          "${arg_TEST_EXECUTABLE}"
           "--gtest_filter=${suite}.${test}"
           "--gtest_also_run_disabled_tests"
           ${TEST_XML_OUTPUT_PARAM}
@@ -192,12 +208,13 @@ function(gtest_discover_tests_impl)
         add_command(set_tests_properties
           "${guarded_testname}"
           PROPERTIES
-          WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+          WORKING_DIRECTORY "${arg_TEST_WORKING_DIR}"
           SKIP_REGULAR_EXPRESSION "\\[  SKIPPED \\]"
           ${properties}
         )
 
-        # possibly unbalanced square brackets render lists invalid so skip such tests in ${_TEST_LIST}
+        # possibly unbalanced square brackets render lists invalid so skip such
+        # tests in ${arg_TEST_LIST}
         if(NOT "${testname}" MATCHES [=[(\[|\])]=])
           # escape ;
           string(REPLACE [[;]] [[\\;]] testname "${testname}")
@@ -215,7 +232,7 @@ function(gtest_discover_tests_impl)
   # Create a list of all discovered tests, which users may use to e.g. set
   # properties on the tests
   flush_tests_buffer()
-  add_command(set "" ${_TEST_LIST} "${tests}")
+  add_command(set "" ${arg_TEST_LIST} "${tests}")
 
   # Write CTest script
   flush_script()