Implement datetime handling in pytest-bdd

- This was awful and convoluted

Co-authored-by: Micah Jerome Ellison <micah.jerome.ellison@gmail.com>

tests/unit/test_exception.py

@@ -0,0 +1,19 @@
+import textwrap
+
+from jrnl.exception import JrnlError
+
+
+def test_config_directory_exception_message():
+    ex = JrnlError(
+        "ConfigDirectoryIsFile", config_directory_path="/config/directory/path"
+    )
+
+    assert ex.message == textwrap.dedent(
+        """
+        The path to your jrnl configuration directory is a file, not a directory:
+        
+        /config/directory/path
+        
+        Removing this file will allow jrnl to save its configuration.
+		"""
+    )