Increase test coverage

tests/test_keys_iter.py

@@ -35,7 +35,8 @@ def test_modify_with_active_iterators(sorted_dict, iterators, advance):
     sorted_dict_len = len(sorted_dict)
     sorted_dict_keys = sorted_dict.keys()
     sorted_dict_keys_iters = [iter(sorted_dict_keys) for _ in range(iterators)]
-    advances = [random.randint(0, min(advance, sorted_dict_len)) for _ in sorted_dict_keys_iters]
+    rg = random.Random(f"{__name__}-{sorted_dict_len}-{iterators}-{advance}")
+    advances = [rg.randint(0, min(advance, sorted_dict_len)) for _ in sorted_dict_keys_iters]
 
     # Advance the iterators by the arbitrary amounts determined above. Record
     # the keys the iterators point to as locked keys.

tests/test_uncommon_errors.py

@@ -0,0 +1,19 @@
+import re
+
+import pytest
+
+from pysorteddict import SortedDict
+
+
+def test_key_repr_error():
+    sorted_dict = SortedDict()
+    sorted_dict[2**15000] = 0
+    with pytest.raises(ValueError, match=re.escape("Exceeds the limit")):
+        str(sorted_dict)
+
+
+def test_value_repr_error():
+    sorted_dict = SortedDict()
+    sorted_dict[0] = 2**15000
+    with pytest.raises(ValueError, match=re.escape("Exceeds the limit")):
+        str(sorted_dict)