trackdb: Add scaffolding for handling library paths

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

test_trackdb.py

@@ -0,0 +1,25 @@
+# Copyright 2020 (c) Anna Schumaker.
+import pathlib
+import trackdb
+import unittest
+
+test_tracks  = pathlib.Path("./trier/Test Album")
+
+class TestTrackDB(unittest.TestCase):
+    def setUp(self):
+        trackdb.reset()
+
+    def test_trackdb_init(self):
+        self.assertEqual(trackdb.library_paths, [ ])
+
+    def test_trackdb_add_path(self):
+        trackdb.add_path(test_tracks)
+        self.assertEqual(trackdb.library_paths, [ test_tracks ])
+
+        trackdb.remove_path(test_tracks)
+        self.assertEqual(trackdb.library_paths, [ ])
+
+    def test_trackdb_reset(self):
+        trackdb.library_paths = [ 1, 2, 3 ]
+        trackdb.reset()
+        self.assertEqual(trackdb.library_paths, [ ])

trackdb/__init__.py

@@ -0,0 +1,12 @@
+# Copyright 2020 (c) Anna Schumaker.
+
+library_paths = [ ]
+
+def add_path(path):
+    library_paths.append(path)
+
+def remove_path(path):
+    library_paths.remove(path)
+
+def reset():
+    library_paths.clear()