Fix TestDataArray.test_curvefit_helpers and TestIndexVariable.test_concat_periods (#11204)

* Filter deprecated warning
* Remove inspect.signature raises error test. The example no longer raises an error
* Type of error changed in numpy 2.4

Author: jsignell

xarray/core/utils.py

@@ -205,15 +205,15 @@ def get_valid_numpy_dtype(array: np.ndarray | pd.Index) -> np.dtype:
 
 
 def maybe_coerce_to_str(index, original_coords):
-    """maybe coerce a pandas Index back to a nunpy array of type str
+    """maybe coerce a pandas Index back to a numpy array of type str
 
     pd.Index uses object-dtype to store str - try to avoid this for coords
     """
     from xarray.core import dtypes
 
     try:
         result_type = dtypes.result_type(*original_coords)
-    except TypeError:
+    except (TypeError, ValueError):
         pass
     else:
         if result_type.kind in "SU":

xarray/tests/test_computation.py

@@ -2646,6 +2646,7 @@ def test_complex_number_reduce(compute_backend):
     da.min()
 
 
+@pytest.mark.filterwarnings("ignore:numpy.fix is deprecated.")
 def test_fix() -> None:
     val = 3.0
     val_fixed = np.fix(val)

xarray/tests/test_dataarray.py

@@ -4908,8 +4908,6 @@ def exp_decay(t, n0, tau=1):
         param_names = ["a"]
         params, func_args = _get_func_args(np.power, param_names)
         assert params == param_names
-        with pytest.raises(ValueError):
-            _get_func_args(np.power, [])
 
     @requires_scipy
     @pytest.mark.parametrize("use_dask", [True, False])