give better error messages for "binary search" tests

tests/test_binary_search.py

@@ -4,10 +4,10 @@ from random import randint
 def test_binary_search():
     from search import binary_search
 
-    values = [randint(0, 1000) for _ in range(100)]
+    values = sorted([randint(0, 1000) for _ in range(100)])
 
     for v in values:
-        assert binary_search(sorted(values), v), "aie"
+        assert binary_search(values, v), f"{v} should be in {values}"
 
     for v in [randint(1000, 2000) for _ in range(100)]:
-        assert not binary_search(sorted(values), v), "foo"
+        assert not binary_search(values, v), f"{v} should NOT be in {values}"