update tests and fix bug

Author: glaukiol1

main

@@ -107,6 +107,8 @@ func getenv(self py.Object, args py.Tuple) (py.Object, error) {
 		} else {
 			return nil, py.ExceptionNewf(py.TypeError, "Expected argument of type string")
 		}
+	} else {
+		return nil, py.ExceptionNewf(py.TypeError, "Expected argument of type string")
 	}
 	var res py.Object // hold the result value
 	res, err = getEnvVariables().M__getitem__(key)

os/os.module.go

@@ -66,6 +66,55 @@ def _fail(test_name):
     _fail('os.chdir(os.environ.get("HOME")) == None')
     failed+=1
 
+try:
+    os.chdir(1)
+    _fail("os.chdir(1) (invalid argument)")
+    failed+=1
+except TypeError:
+    _pass("os.chdir(1) (invalid argument)")
+    passed_tests+=1
+
+try:
+    os.environ.get(15)
+    _fail("os.environ.get(15) (invalid argument)")
+    failed+=1
+except KeyError:
+    _pass("os.environ.get(15) (invalid argument)")
+    passed_tests+=1
+
+try:
+    os.putenv()
+    _fail("os.putenv() (invalid argument)")
+    failed+=1
+except TypeError:
+    _pass("os.putenv() (invalid argument)")
+    passed_tests+=1
+
+try:
+    os.unsetenv()
+    _fail("os.unsetenv() (invalid argument)")
+    failed+=1
+except TypeError:
+    _pass("os.unsetenv() (invalid argument)")
+    passed_tests+=1
+
+
+try:
+    os.getenv()
+    _fail("os.getenv() (invalid argument)")
+    failed+=1
+except TypeError:
+    _pass("os.getenv() (invalid argument)")
+    passed_tests+=1
+
+try:
+    os.unsetenv("1","2") # one more than needed
+    _fail('os.unsetenv("1","2") (more arguments than needed)')
+    failed+=1
+except TypeError:
+    _pass('os.unsetenv("1","2") (more arguments than needed)')    
+    passed_tests+=1
+
 if os.getcwd() == os.environ.get("HOME"):
     _pass('os.getcwd() == os.environ.get("HOME")')
     passed_tests+=1
@@ -108,6 +157,7 @@ def _fail(test_name):
     _fail('os.getenv("TEST_VAR") == None')
     failed+=1
 
+print()
 print(bcolors.ENDC+bcolors.BOLD+bcolors.HEADER+"Please check if $HOME will be outputted...")
 print(bcolors.ENDC)