Add missing assertRaises, remove old example in docs

Author: ahosgood

docs/dates-and-times.md

@@ -61,9 +61,6 @@ Formats a date and time into the format used by The National Archives.
 ```py
 from tna_utils.datetime import pretty_datetime
 
-print(pretty_datetime(foo))
-# bar
-
 print(pretty_datetime("2000-01-01T12:00:00Z"))
 # 1 January 2000, 12:00
 

test/test_datetime.py

@@ -81,16 +81,23 @@ def test_unhappy_invalid_month(self):
     def test_unhappy_invalid_years(self):
         with self.assertRaises(ValueError):
             get_date_from_string("999")
+        with self.assertRaises(ValueError):
             get_date_from_string("06")
+        with self.assertRaises(ValueError):
             get_date_from_string("00")
+        with self.assertRaises(ValueError):
             get_date_from_string("99")
+        with self.assertRaises(ValueError):
             get_date_from_string("9")
+        with self.assertRaises(ValueError):
             get_date_from_string("abc")
 
     def test_unhappy_blank_values(self):
         with self.assertRaises(ValueError):
             get_date_from_string("")
+        with self.assertRaises(ValueError):
             get_date_from_string(None)
+        with self.assertRaises(ValueError):
             get_date_from_string(False)
 
 
@@ -569,18 +576,23 @@ def test_happy_date(self):
     def test_unhappy_string(self):
         with self.assertRaises(ValueError):
             is_today_in_date_range(None, "2023-10-31")
+        with self.assertRaises(ValueError):
             is_today_in_date_range("2023-10-01", None)
+        with self.assertRaises(ValueError):
             is_today_in_date_range(None, None)
 
     def test_unhappy_invalid(self):
         with self.assertRaises(ValueError):
             is_today_in_date_range(None, "foo")
+        with self.assertRaises(ValueError):
             is_today_in_date_range("bar", None)
 
     def test_unhappy_date(self):
         with self.assertRaises(ValueError):
             is_today_in_date_range(None, datetime.date(2023, 10, 31))
+        with self.assertRaises(ValueError):
             is_today_in_date_range(datetime.date(2023, 10, 31), None)
+        with self.assertRaises(ValueError):
             is_today_in_date_range(None, None)