Added testcase.

Author: semohr

test/autotag/test_match.py

@@ -0,0 +1,40 @@
+import pytest
+
+from beets.autotag.match import _parse_search_terms_with_fallbacks
+
+
+class TestSearchTermHandling:
+    @pytest.mark.parametrize(
+        "input_pairs, expected",
+        [
+            (
+                (("A", "F1"), ("B", "F2")),
+                ("A", "B"),
+            ),
+            (
+                (("", "F1"), ("B", "F2")),
+                ("", "B"),
+            ),
+            (
+                (("", "F1"), ("", "F2")),
+                ("F1", "F2"),
+            ),
+            (
+                (("A", "F1"), (None, "F2")),
+                ("A", ""),
+            ),
+            (
+                ((None, "F1"), (None, "F2")),
+                ("F1", "F2"),
+            ),
+        ],
+    )
+    def test_search_parsing(self, input_pairs, expected):
+        result = _parse_search_terms_with_fallbacks(*input_pairs)
+        assert result == expected
+
+        # Should also apply for the reversed order of inputs
+        reversed_pairs = tuple(reversed(input_pairs))
+        reversed_expected = tuple(reversed(expected))
+        reversed_result = _parse_search_terms_with_fallbacks(*reversed_pairs)
+        assert reversed_result == reversed_expected