more Parameters fixup

tests/test_type_checker.py

@@ -0,0 +1,21 @@
+import numpy as np
+import pytest
+
+from scgenerator.parameter import type_checker
+
+
+def test_type_checker():
+    numero = type_checker(int)
+
+    @numero
+    def natural_number(name, n):
+        if n < 0:
+            raise ValueError(f"{name!r} must be positive")
+
+    with pytest.raises(TypeError, match="of type"):
+        numero("a", np.arange(45))
+    with pytest.raises(ValueError, match="positive"):
+        natural_number("b", -1)
+    with pytest.raises(TypeError, match="of type"):
+        natural_number("c", 1.0)
+    natural_number("d", 1)