Refactored sdp serializers

tests/test_utils.py

@@ -0,0 +1,12 @@
+import core.utils
+import pytest
+
+
+@pytest.mark.parametrize("lst, as_string", [
+    (None, "",),
+    ([], ""),
+    (["hello", "world"], "hello world"),
+    (["hello world", "my friend"], '"hello world" "my friend"')
+])
+def test_i_can_create_string_from_a_list(lst, as_string):
+    assert core.utils.sysarg_to_string(lst) == as_string