Add tests for --map-project values

tests/test_validation.py

@@ -0,0 +1,33 @@
+""" Validation Tests
+
+Test argument/option validations
+"""
+import click
+import pytest
+from todoist_taskwarrior import utils
+
+
+def validate(fn, value):
+    """Calls the validation with None for `ctx` and `param`.
+
+    Note: This could definitely be an issue for validations that
+    use either param, but at the moment it's a simplification
+    which works.
+    """
+    return fn(None, None, value)
+
+
+def test_validate_map_project():
+    # Simple
+    assert validate(utils.validate_map_project, ('HELLO=WORLD',)) == {'HELLO': 'WORLD'}
+
+    # Missing DST
+    assert validate(utils.validate_map_project, ('HELLO=',)) == {'HELLO': None}
+
+    # Multiple
+    assert validate(utils.validate_map_project, ('FOO=BAR', 'BAR=BAZZ')) == {'FOO': 'BAR', 'BAR': 'BAZZ'}
+
+    # Invalid, no '='
+    with pytest.raises(click.BadParameter):
+        assert validate(utils.validate_map_project, ('FOO',)) == None
+