add PackageBlacklist SQLAlchemy ORM model

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/package_blacklist.py

+from sqlalchemy import Column, Integer
+from sqlalchemy.exc import IntegrityError
+
+from aurweb.models.declarative import Base
+
+
+class PackageBlacklist(Base):
+    __tablename__ = "PackageBlacklist"
+
+    ID = Column(Integer, primary_key=True)
+
+    __mapper_args__ = {"primary_key": [ID]}
+
+    def __init__(self, Name: str = None):
+        self.Name = Name
+        if not self.Name:
+            raise IntegrityError(
+                statement="Column Name cannot be null.",
+                orig="PackageBlacklist.Name",
+                params=("NULL"))

test/test_package_blacklist.py

+import pytest
+
+from sqlalchemy.exc import IntegrityError
+
+from aurweb.db import create, rollback
+from aurweb.models.package_base import PackageBase
+from aurweb.models.package_blacklist import PackageBlacklist
+from aurweb.models.user import User
+from aurweb.testing import setup_test_db
+
+user = pkgbase = None
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    global user, pkgbase
+
+    setup_test_db("PackageBlacklist", "PackageBases", "Users")
+
+    user = create(User, Username="test", Email="test@example.org",
+                  RealName="Test User", Passwd="testPassword")
+    pkgbase = create(PackageBase, Name="test-package", Maintainer=user)
+
+
+def test_package_blacklist_creation():
+    package_blacklist = create(PackageBlacklist, Name="evil-package")
+    assert bool(package_blacklist.ID)
+    assert package_blacklist.Name == "evil-package"
+
+
+def test_package_blacklist_null_name_raises_exception():
+    with pytest.raises(IntegrityError):
+        create(PackageBlacklist)
+    rollback()