Add tests for priority conversions

tests/test_priority.py

@@ -0,0 +1,20 @@
+""" Priority Tests
+
+Test conversions between Todoist and Taskwarrior priorities.
+"""
+import pytest
+from todoist_taskwarrior import utils
+
+
+def test_priorities():
+    assert utils.parse_priority(1) == None
+    assert utils.parse_priority(2) == 'L'
+    assert utils.parse_priority(3) == 'M'
+    assert utils.parse_priority(4) == 'H'
+
+def test_priorities_str():
+    assert utils.parse_priority('1') == None
+    assert utils.parse_priority('2') == 'L'
+    assert utils.parse_priority('3') == 'M'
+    assert utils.parse_priority('4') == 'H'
+