Updated tests.toml and regenerated test file for Custom-Set. (#3728)

Author: BethanyG

exercises/practice/custom-set/.meta/tests.toml

@@ -114,6 +114,9 @@ description = "Difference (or Complement) of a set is a set of all elements that
 [c5ac673e-d707-4db5-8d69-7082c3a5437e]
 description = "Difference (or Complement) of a set is a set of all elements that are only in the first set -> difference of two non-empty sets is a set of elements that are only in the first set"
 
+[20d0a38f-7bb7-4c4a-ac15-90c7392ecf2b]
+description = "Difference (or Complement) of a set is a set of all elements that are only in the first set -> difference removes all duplicates in the first set"
+
 [c45aed16-5494-455a-9033-5d4c93589dc6]
 description = "Union returns a set of all elements in either set -> union of empty sets is an empty set"
 

exercises/practice/custom-set/custom_set_test.py

@@ -1,6 +1,6 @@
 # These tests are auto-generated with test data from:
 # https://github.com/exercism/problem-specifications/tree/main/exercises/custom-set/canonical-data.json
-# File last updated on 2023-12-27
+# File last updated on 2024-07-08
 
 import unittest
 
@@ -196,6 +196,12 @@ def test_difference_of_two_non_empty_sets_is_a_set_of_elements_that_are_only_in_
         expected = CustomSet([1, 3])
         self.assertEqual(set1 - set2, expected)
 
+    def test_difference_removes_all_duplicates_in_the_first_set(self):
+        set1 = CustomSet([1, 1])
+        set2 = CustomSet([1])
+        expected = CustomSet()
+        self.assertEqual(set1 - set2, expected)
+
     def test_union_of_empty_sets_is_an_empty_set(self):
         set1 = CustomSet()
         set2 = CustomSet()