script.utils: add test to highlight bug in encode/decode functions

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@68179 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/script/testsuite/test_utils.py

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+import os
+
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+
+from grass.script import utils
+
+
+def change_environ(**envs):
+    NOT_FOUND = 'Not found!'
+    original_envs = {k: os.environ.get(k, NOT_FOUND) for k in envs.keys()}
+
+    def work_with_env(func):
+        def wrap_func(*args, **kwargs):
+            # modify the environment variables
+            for k, v in envs.items():
+                os.environ[k] = v
+
+            # execute
+            func(*args, **kwargs)
+
+            # restore the environment variables
+            for k, v in envs.items():
+                oval = original_envs[k]
+                if oval == NOT_FOUND:
+                    os.environ.pop(k)
+                else:
+                    os.environ[k] = oval
+        return wrap_func
+    return work_with_env
+
+
+class TestEncode(TestCase):
+    """Tests function `encode` that convert value to bytes."""
+
+    def test_bytes(self):
+        self.assertEqual(b'text', utils.encode(b'text'))
+
+    def test_unicode(self):
+        self.assertEqual(b'text', utils.encode(u'text'))
+
+    @change_environ(LC_ALL='C')
+    def test_bytes_LC_ALL_C(self):
+        self.assertEqual(b'text', utils.encode(b'text'))
+
+    @change_environ(LC_ALL='C')
+    def test_unicode_LC_ALL_C(self):
+        self.assertEqual(b'text', utils.encode(u'text'))
+
+
+class TestDecode(TestCase):
+    """Tests function `encode` that convert value to unicode."""
+
+    def test_bytes(self):
+        self.assertEqual(u'text', utils.decode(b'text'))
+
+    def test_unicode(self):
+        self.assertEqual(u'text', utils.decode(u'text'))
+
+    @change_environ(LC_ALL='C')
+    def test_bytes_LC_ALL_C(self):
+        self.assertEqual(u'text', utils.decode(b'text'))
+
+    @change_environ(LC_ALL='C')
+    def test_unicode_LC_ALL_C(self):
+        self.assertEqual(u'text', utils.decode(u'text'))
+
+
+
+
+if __name__ == '__main__':
+    test()