add DependencyType SQLAlchemy ORM model

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

aurweb/models/dependency_type.py

+from sqlalchemy.orm import mapper
+
+from aurweb.schema import DependencyTypes
+
+
+class DependencyType:
+    def __init__(self, Name: str = None):
+        self.Name = Name
+
+
+mapper(DependencyType, DependencyTypes)

test/test_dependency_type.py

+import pytest
+
+from aurweb.db import create, delete, query
+from aurweb.models.dependency_type import DependencyType
+from aurweb.testing import setup_test_db
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    setup_test_db()
+
+
+def test_dependency_types():
+    dep_types = ["depends", "makedepends", "checkdepends", "optdepends"]
+    for dep_type in dep_types:
+        dependency_type = query(DependencyType,
+                                DependencyType.Name == dep_type).first()
+        assert dependency_type is not None
+
+
+def test_dependency_type_creation():
+    dependency_type = create(DependencyType, Name="Test Type")
+    assert bool(dependency_type.ID)
+    assert dependency_type.Name == "Test Type"
+    delete(DependencyType, DependencyType.ID == dependency_type.ID)
+
+
+def test_dependency_type_null_name_uses_default():
+    dependency_type = create(DependencyType)
+    assert dependency_type.Name == str()
+    delete(DependencyType, DependencyType.ID == dependency_type.ID)