Added test for bad type [skip ci]

Author: ankane

tests/test_sparse_vector.py

@@ -26,6 +26,10 @@ def test_list(self) -> None:
     def test_list_empty(self) -> None:
         assert SparseVector([]).to_list() == []
 
+    def test_list_str(self) -> None:
+        with pytest.raises(ValueError, match='could not convert string to float') as error:
+            SparseVector([1, 'two', 3])  # type: ignore
+
     def test_list_dimensions(self) -> None:
         with pytest.raises(ValueError) as error:
             SparseVector([1, 0, 2, 0, 3, 0], 6)  # type: ignore