correctly failing tests for np.str_ in a tuple

src/numpydantic/testing/cases.py

@@ -126,6 +126,27 @@ class SubClass(BasicModel):
     ValidationCase(annotation_dtype=str, dtype=str, passes=True, id="str-str"),
     ValidationCase(annotation_dtype=str, dtype=int, passes=False, id="str-int"),
     ValidationCase(annotation_dtype=str, dtype=float, passes=False, id="str-float"),
+    ValidationCase(
+        annotation_dtype=np.str_,
+        dtype=str,
+        passes=True,
+        id="np_str-str",
+        marks={"np_str", "str"},
+    ),
+    ValidationCase(
+        annotation_dtype=np.str_,
+        dtype=np.str_,
+        passes=True,
+        id="np_str-np_str",
+        marks={"np_str", "str"},
+    ),
+    ValidationCase(
+        annotation_dtype=(int, np.str_),
+        dtype=str,
+        passes=True,
+        id="tuple_np_str-str",
+        marks={"np_str", "str", "tuple"},
+    ),
     ValidationCase(
         annotation_dtype=BasicModel, dtype=BasicModel, passes=True, id="model-model"
     ),

src/numpydantic/testing/interfaces.py

@@ -75,6 +75,8 @@ def make_array(
             data = np.array(array, dtype=dtype)
         elif dtype is str:
             data = generator.random(shape).astype(bytes)
+        elif dtype is np.str_:
+            data = generator.random(shape).astype("S32")
         elif dtype is datetime:
             data = np.empty(shape, dtype="S32")
             data.fill(datetime.now(timezone.utc).isoformat().encode("utf-8"))
@@ -106,7 +108,7 @@ def make_array(
         array_path = "/" + "_".join([str(s) for s in shape]) + "__" + dtype.__name__
         if array is not None:
             data = np.array(array, dtype=dtype)
-        elif dtype is str:
+        elif dtype in (str, np.str_):
             dt = np.dtype([("data", np.dtype("S10")), ("extra", "i8")])
             data = np.array([("hey", 0)] * np.prod(shape), dtype=dt).reshape(shape)
         elif dtype is datetime: