Add validators

test/test_db.py

@@ -10,7 +10,14 @@ from tinydb.storages import MemoryStorage
 
 from grung import examples
 from grung.db import GrungDB
-from grung.exceptions import CircularReferenceError, UniqueConstraintError
+from grung.exceptions import (
+    CircularReferenceError,
+    InvalidFieldTypeError,
+    InvalidLengthError,
+    InvalidSizeError,
+    PatternMatchError,
+    UniqueConstraintError,
+)
 
 
 @pytest.fixture
@@ -82,7 +89,7 @@ def test_subgroups(db):
 
     # recursion!
     with pytest.raises(CircularReferenceError):
-        tos.members = [tos]
+        tos.groups = [tos]
         db.save(tos)
 
 
@@ -201,3 +208,29 @@ def test_file_pointers(db):
 
     location_on_disk = db.path / album._metadata.fields["review"].relpath(album)
     assert location_on_disk.read_text() == album.review
+
+
+@pytest.mark.parametrize(
+    "updates, expected",
+    [
+        ({"name": ""}, InvalidLengthError),
+        ({"name": "a name longer than 30 characters is what we have here"}, InvalidLengthError),
+        ({"name": 23}, InvalidFieldTypeError),
+        ({"number": -1}, InvalidSizeError),
+        ({"number": 256}, InvalidSizeError),
+        ({"email": "foo+alias@"}, PatternMatchError),
+    ],
+    ids=[
+        "name too short",
+        "name too long",
+        "name is not a string",
+        "number too small",
+        "number too big",
+        "invalid email addres",
+    ],
+)
+def test_validators(updates, expected, db):
+    user = db.save(examples.User(name="john", email="john@foo", password="fnord", created=datetime.utcnow()))
+    with pytest.raises(expected):
+        user.update(**updates)
+        db.save(user)