added circle CI config with basic unit tests

tests/unit/test_cache.py

@@ -0,0 +1,80 @@
+# tests/unit/test_cache.py
+
+import pytest
+import datetime
+import sqlalchemy
+from sqlalchemy import create_engine, select
+from unittest import mock
+from spotify_to_tidal.cache import MatchFailureDatabase, TrackMatchCache
+
+
+# Setup an in-memory SQLite database for testing
+@pytest.fixture
+def in_memory_db():
+    engine = create_engine("sqlite:///:memory:")
+    return engine
+
+
+# Test MatchFailureDatabase
+def test_cache_match_failure(in_memory_db, mocker):
+    mocker.patch(
+        "spotify_to_tidal.cache.sqlalchemy.create_engine", return_value=in_memory_db
+    )
+    failure_db = MatchFailureDatabase()
+
+    track_id = "test_track"
+    failure_db.cache_match_failure(track_id)
+
+    with failure_db.engine.connect() as connection:
+        result = connection.execute(
+            select(failure_db.match_failures).where(
+                failure_db.match_failures.c.track_id == track_id
+            )
+        ).fetchone()
+        assert result is not None
+        assert result.track_id == track_id
+
+
+def test_has_match_failure(in_memory_db, mocker):
+    mocker.patch(
+        "spotify_to_tidal.cache.sqlalchemy.create_engine", return_value=in_memory_db
+    )
+    failure_db = MatchFailureDatabase()
+
+    track_id = "test_track"
+    failure_db.cache_match_failure(track_id)
+
+    assert failure_db.has_match_failure(track_id) is True
+
+
+def test_remove_match_failure(in_memory_db, mocker):
+    mocker.patch(
+        "spotify_to_tidal.cache.sqlalchemy.create_engine", return_value=in_memory_db
+    )
+    failure_db = MatchFailureDatabase()
+
+    track_id = "test_track"
+    failure_db.cache_match_failure(track_id)
+    failure_db.remove_match_failure(track_id)
+
+    with failure_db.engine.connect() as connection:
+        result = connection.execute(
+            select(failure_db.match_failures).where(
+                failure_db.match_failures.c.track_id == track_id
+            )
+        ).fetchone()
+        assert result is None
+
+
+# Test TrackMatchCache
+def test_track_match_cache_insert():
+    track_cache = TrackMatchCache()
+    track_cache.insert(("spotify_id", 123))
+    assert track_cache.get("spotify_id") == 123
+
+
+def test_track_match_cache_get():
+    track_cache = TrackMatchCache()
+    track_cache.insert(("spotify_id", 123))
+    assert track_cache.get("spotify_id") == 123
+    assert track_cache.get("nonexistent_id") is None