test os
os.error:  <class 'OSError'>
os.getenv($GPYTHON_TEST_HOME)= None
os.environ($GPYTHON_TEST_HOME)= None
os.getenv($GPYTHON_TEST_HOME)= /home/go
os.unsetenv($GPYTHON_TEST_HOME)= None
os.error is OSError [OK]
os.getcwd() != None [OK]
os.getcwdb() != None [OK]
os.system('echo hello')...
hello

os.getpid is greater than 1 [OK]
os.chdir(testdir) [OK]
os.chdir(1) failed [OK]
os.environ.get(15) failed [OK]
os.putenv() failed [OK]
os.unsetenv() failed [OK]
os.getenv() failed [OK]
os.unsetenv("FOO", "BAR") failed [OK]
bytes(os.getcwd(), "utf-8") == os.getcwdb() [OK]
os.sep: [OK]
os.pathsep: [OK]
os.linesep: [OK]
os.devnull: [OK]
os.altsep: [OK]
caught: OSError: 'Bad file descriptor' [OK]
[b'dir1', b'dir2']
['dir1', 'dir2']
caught: SystemError - no such file or directory [OK]
caught: FileExistsError [OK]
caught: SystemError - directory not empty [OK]
['dir1']
os.{mkdir,rmdir,remove,removedirs} worked as expected
OK
