TST: Add deprecation tests for out-of-bound pyint conversion deprecation

numpy/core/tests/test_deprecations.py

@@ -1196,3 +1196,37 @@ def test_deprecated_raised(self, dtype):
                 np.loadtxt(["10.5"], dtype=dtype)
             except ValueError as e:
                 assert isinstance(e.__cause__, DeprecationWarning)
+
+
+class TestPyIntConversion(_DeprecationTestCase):
+    message = r".*stop allowing conversion of out-of-bound.*"
+
+    @pytest.mark.parametrize("dtype", np.typecodes["AllInteger"])
+    def test_deprecated_scalar(self, dtype):
+        dtype = np.dtype(dtype)
+        info = np.iinfo(dtype)
+
+        # Cover the most common creation paths (all end up in the
+        # same place):
+
+        def scalar(value, dtype):
+            dtype.type(value)
+
+        def assign(value, dtype):
+            arr = np.array([0, 0, 0], dtype=dtype)
+            arr[2] = value
+
+        def create(value, dtype):
+            np.array([value], dtype=dtype)
+
+
+        for creation_func in [scalar, assign, create]:
+            try:
+                self.assert_deprecated(lambda: creation_func(info.min - 1, dtype))
+            except OverflowError:
+                pass  # OverflowErrors always happened also before and are OK.
+
+            try:
+                self.assert_deprecated(lambda: creation_func(info.max + 1, dtype))
+            except OverflowError:
+                pass  # OverflowErrors always happened also before and are OK.