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Editing: FindCxxTest.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindCxxTest
-----------

Find CxxTest unit testing framework.

Find the CxxTest suite and declare a helper macro for creating unit
tests and integrating them with CTest.  For more details on CxxTest
see https://cxxtest.com

INPUT Variables

CXXTEST_USE_PYTHON [deprecated since 1.3]
       Only used in the case both Python & Perl
       are detected on the system to control
       which CxxTest code generator is used.
       Valid only for CxxTest version 3.

NOTE: In older versions of this Find Module,
       this variable controlled if the Python test
       generator was used instead of the Perl one,
       regardless of which scripting language the
       user had installed.

CXXTEST_TESTGEN_ARGS (since CMake 2.8.3)
       Specify a list of options to pass to the CxxTest code
       generator.  If not defined, --error-printer is
       passed.

OUTPUT Variables

CXXTEST_FOUND
       True if the CxxTest framework was found
   CXXTEST_INCLUDE_DIRS
       Where to find the CxxTest include directory
   CXXTEST_PERL_TESTGEN_EXECUTABLE
       The perl-based test generator
   CXXTEST_PYTHON_TESTGEN_EXECUTABLE
       The python-based test generator
   CXXTEST_TESTGEN_EXECUTABLE (since CMake 2.8.3)
       The test generator that is actually used (chosen using user preferences
       and interpreters found in the system)
   CXXTEST_TESTGEN_INTERPRETER (since CMake 2.8.3)
       The full path to the Perl or Python executable on the system, on
       platforms where the script cannot be executed using its shebang line.

MACROS for optional use by CMake users:

CXXTEST_ADD_TEST(<test_name> <gen_source_file> <input_files_to_testgen...>)
       Creates a CxxTest runner and adds it to the CTest testing suite
       Parameters:
           test_name               The name of the test
           gen_source_file         The generated source filename to be
                                   generated by CxxTest
           input_files_to_testgen  The list of header files containing the
                                   CxxTest::TestSuite's to be included in
                                   this runner

#==============
       Example Usage:

find_package(CxxTest)
           if(CXXTEST_FOUND)
               include_directories(${CXXTEST_INCLUDE_DIR})
               enable_testing()

CXXTEST_ADD_TEST(unittest_foo foo_test.cc
                                 ${CMAKE_CURRENT_SOURCE_DIR}/foo_test.h)
               target_link_libraries(unittest_foo foo) # as needed
           endif()

This will (if CxxTest is found):
              1. Invoke the testgen executable to autogenerate foo_test.cc in the
                 binary tree from "foo_test.h" in the current source directory.
              2. Create an executable and test called unittest_foo.

#=============
      Example foo_test.h:

#include <cxxtest/TestSuite.h>

class MyTestSuite : public CxxTest::TestSuite
          {
          public:
             void testAddition( void )
             {
                TS_ASSERT( 1 + 1 > 1 );
                TS_ASSERT_EQUALS( 1 + 1, 2 );
             }
          };
#]=======================================================================]

# Version 1.4 (11/18/10) (CMake 2.8.4)
#     Issue 11384: Added support to the CXX_ADD_TEST macro so header
#                  files (containing the tests themselves) show up in
#                  Visual Studio and other IDEs.
#
# Version 1.3 (8/19/10) (CMake 2.8.3)
#     Included patch by Simone Rossetto to check if either Python or Perl
#     are present in the system.  Whichever interpreter that is detected
#     is now used to run the test generator program.  If both interpreters
#     are detected, the CXXTEST_USE_PYTHON variable is obeyed.
#
#     Also added support for CXXTEST_TESTGEN_ARGS, for manually specifying
#     options to the CxxTest code generator.
# Version 1.2 (3/2/08)
#     Included patch from Tyler Roscoe to have the perl & python binaries
#     detected based on CXXTEST_INCLUDE_DIR
# Version 1.1 (2/9/08)
#     Clarified example to illustrate need to call target_link_libraries()
#     Changed commands to lowercase
#     Added licensing info
# Version 1.0 (1/8/08)
#     Fixed CXXTEST_INCLUDE_DIRS so it will work properly
#     Eliminated superfluous CXXTEST_FOUND assignment
#     Cleaned up and added more documentation

#=============================================================
# CXXTEST_ADD_TEST (public macro)
#=============================================================
macro(CXXTEST_ADD_TEST _cxxtest_testname _cxxtest_outfname)
    set(_cxxtest_real_outfname ${CMAKE_CURRENT_BINARY_DIR}/${_cxxtest_outfname})

add_custom_command(
        OUTPUT  ${_cxxtest_real_outfname}
        DEPENDS ${ARGN}
        COMMAND ${CXXTEST_TESTGEN_INTERPRETER}
        ${CXXTEST_TESTGEN_EXECUTABLE} ${CXXTEST_TESTGEN_ARGS} -o ${_cxxtest_real_outfname} ${ARGN}
    )

set_source_files_properties(${_cxxtest_real_outfname} PROPERTIES GENERATED true)
    add_executable(${_cxxtest_testname} ${_cxxtest_real_outfname} ${ARGN})

if(CMAKE_RUNTIME_OUTPUT_DIRECTORY)
        add_test(${_cxxtest_testname} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${_cxxtest_testname})
    elseif(EXECUTABLE_OUTPUT_PATH)
        add_test(${_cxxtest_testname} ${EXECUTABLE_OUTPUT_PATH}/${_cxxtest_testname})
    else()
        add_test(${_cxxtest_testname} ${CMAKE_CURRENT_BINARY_DIR}/${_cxxtest_testname})
    endif()

endmacro()

#=============================================================
# main()
#=============================================================
if(NOT DEFINED CXXTEST_TESTGEN_ARGS)
  set(CXXTEST_TESTGEN_ARGS --error-printer)
endif()

find_package(Python QUIET)
find_package(Perl QUIET)

find_path(CXXTEST_INCLUDE_DIR cxxtest/TestSuite.h)
find_program(CXXTEST_PYTHON_TESTGEN_EXECUTABLE
         NAMES cxxtestgen cxxtestgen.py
         PATHS ${CXXTEST_INCLUDE_DIR})
find_program(CXXTEST_PERL_TESTGEN_EXECUTABLE cxxtestgen.pl
         PATHS ${CXXTEST_INCLUDE_DIR})

if(PYTHON_FOUND OR PERL_FOUND)
  include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)

if(PYTHON_FOUND AND (CXXTEST_USE_PYTHON OR NOT PERL_FOUND OR NOT DEFINED CXXTEST_USE_PYTHON))
    set(CXXTEST_TESTGEN_EXECUTABLE ${CXXTEST_PYTHON_TESTGEN_EXECUTABLE})
    execute_process(COMMAND ${CXXTEST_PYTHON_TESTGEN_EXECUTABLE} --version
      OUTPUT_VARIABLE _CXXTEST_OUT ERROR_VARIABLE _CXXTEST_OUT RESULT_VARIABLE _CXXTEST_RESULT)
    if(_CXXTEST_RESULT EQUAL 0)
      set(CXXTEST_TESTGEN_INTERPRETER "")
    else()
      set(CXXTEST_TESTGEN_INTERPRETER ${Python_EXECUTABLE})
    endif()
    FIND_PACKAGE_HANDLE_STANDARD_ARGS(CxxTest DEFAULT_MSG
        CXXTEST_INCLUDE_DIR CXXTEST_PYTHON_TESTGEN_EXECUTABLE)

elseif(PERL_FOUND)
    set(CXXTEST_TESTGEN_EXECUTABLE ${CXXTEST_PERL_TESTGEN_EXECUTABLE})
    set(CXXTEST_TESTGEN_INTERPRETER ${PERL_EXECUTABLE})
    FIND_PACKAGE_HANDLE_STANDARD_ARGS(CxxTest DEFAULT_MSG
        CXXTEST_INCLUDE_DIR CXXTEST_PERL_TESTGEN_EXECUTABLE)
  endif()

if(CXXTEST_FOUND)
    set(CXXTEST_INCLUDE_DIRS ${CXXTEST_INCLUDE_DIR})
  endif()

else()

set(CXXTEST_FOUND false)
  if(NOT CxxTest_FIND_QUIETLY)
    if(CxxTest_FIND_REQUIRED)
      message(FATAL_ERROR "Neither Python nor Perl found, cannot use CxxTest, aborting!")
    else()
      message(STATUS "Neither Python nor Perl found, CxxTest will not be used.")
    endif()
  endif()

endif()

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