add specific test for intish float

Author: d-v-b

tests/test_dtype/test_npy/test_common.py

@@ -20,6 +20,7 @@
     check_json_float_v2,
     check_json_float_v3,
     check_json_int,
+    check_json_intish_float,
     check_json_str,
     complex_float_to_json_v2,
     complex_float_to_json_v3,
@@ -320,6 +321,12 @@ def test_check_json_int() -> None:
     assert not check_json_int(1.0)
 
 
+def test_check_json_intish_float() -> None:
+    assert check_json_intish_float(0)
+    assert check_json_intish_float(1.0)
+    assert not check_json_intish_float("0")
+
+
 def test_check_json_str() -> None:
     assert check_json_str("0")
     assert not check_json_str(1.0)