Add django pytest skip decorators & placeholder unit tests to confirm

Author: rlskoeser

src/undate/test_utils.py

@@ -0,0 +1,26 @@
+"""
+Utility decorators for unit tests that require django to be installed,
+or not installed. To use, import into unit test and apply
+to test method or class:
+
+```python
+
+from undate.test_utils import skipif_no_django, skipif_django
+
+@skipif_no_django
+def test_django_functionality():
+    ....
+```
+
+"""
+
+import pytest
+
+try:
+    import django
+except ImportError:
+    django = None
+
+skipif_no_django = pytest.mark.skipif(django is None, reason="requires Django")
+
+skipif_django = pytest.mark.skipif(django, reason="requires no Django")

tests/test_django/test_django_setup.py

@@ -0,0 +1,16 @@
+try:
+    import django
+except ImportError:
+    django = None
+
+from undate.test_utils import skipif_no_django, skipif_django
+
+
+@skipif_no_django
+def test_django():
+    assert django is not None
+
+
+@skipif_django
+def test_no_django():
+    assert django is None