Implement FilePointer

test/test_db.py

@@ -1,4 +1,6 @@
+import tempfile
 from datetime import datetime
+from pathlib import Path
 from pprint import pprint as print
 from time import sleep
 
@@ -13,9 +15,10 @@ from grung.exceptions import PointerReferenceError, UniqueConstraintError
 
 @pytest.fixture
 def db():
-    _db = GrungDB.with_schema(examples, storage=MemoryStorage)
-    yield _db
-    print(_db)
+    with tempfile.TemporaryDirectory() as path:
+        _db = GrungDB.with_schema(examples, path=Path(path), storage=MemoryStorage)
+        yield _db
+        print(_db)
 
 
 def test_crud(db):
@@ -153,10 +156,12 @@ def test_mapping(db):
             name="The Impossible Kid",
             credits={"Produced By": "Aesop Rock", "Lyrics By": "Aesop Rock", "Puke in the MeowMix By": "Kirby"},
             tracks=["Mystery Fish", "Rings", "Lotta Years", "Dorks"],
+            cover=b"some jpg data",
         )
     )
     assert album.credits["Produced By"] == "Aesop Rock"
     assert album.tracks[0] == "Mystery Fish"
+    assert album.cover == b"some jpg data"
 
     aes = db.save(
         examples.Artist(
@@ -170,3 +175,6 @@ def test_mapping(db):
     assert album.name in aes.albums
     assert aes.albums[album.name].uid == album.uid
     assert "Kirby" in aes.albums[album.name].credits.values()
+
+    location_on_disk = db.path / album._metadata.fields["cover"].relpath(album)
+    assert location_on_disk.read_bytes() == album.cover