add test and add os.devnull to globals

Author: glaukiol1

os/os.module.go

@@ -90,6 +90,7 @@ func init() {
 		"pathsep": getpathsep(),
 		"linesep": getlinesep(),
 		"defpath": getdefpath(),
+		"devnull": getdevnull(),
 	}
 
 	py.RegisterModule(&py.ModuleImpl{

os/os.test.py

@@ -198,6 +198,16 @@ def _fail(test_name):
     _fail("os.linesep corresponding with os.name")
     failed+=1
 
+if os.devnull == "/dev/null" and os.name == "posix":
+    _pass('os.devnull == "/dev/null" and os.name == "posix"')
+    passed_tests+=1
+elif os.devnull == "nul" and os.name == "nt":
+    _pass('os.devnull == "nul" and os.name == "nt"')
+    passed_tests+=1
+else:
+    _fail("os.devnull corresponding with os.name")
+    failed+=1
+
 print()
 print(bcolors.ENDC+bcolors.BOLD+bcolors.HEADER+"Please check if $HOME will be outputted...")
 print(bcolors.ENDC)