code: def test_customize_compiler(self):
      os.environ["AR"] = "my_ar"
      os.environ["ARFLAGS"] = "-arflags"
  
      # make sure AR gets caught
      class compiler:
          compiler_type = "unix"
  
          def set_executables(self, **kw):
              self.exes = kw
  
      comp = compiler()
      customize_compiler(comp)
      self.assertEqual(comp.exes["archiver"], "my_ar -arflags")
  
imports: import os
  import unittest
  from test.test_support import captured_stdout
  from distutils.ccompiler import gen_lib_options, CCompiler, get_default_compiler
  from distutils.sysconfig import customize_compiler
  from distutils import debug
  from distutils.tests import support
label_desc: Use image node_id 4 for calling the CCompilerTestCase obj's underlying member method code with example usage: obj.test_customize_compiler() without return types