modify tests relating to __array__ and assert FutureWarning

Author: KevsterAmp

pandas/tests/arrays/sparse/test_array.py

@@ -500,8 +500,12 @@ def test_array_interface(arr_data, arr):
         # copy=False semantics are only supported in NumPy>=2.
         return
 
-    # for sparse arrays, copy=False is never allowed
-    with pytest.raises(ValueError, match="Unable to avoid copy while creating"):
+    msg = "Starting on NumPy 2.0, the behavior of the 'copy' keyword has changed "
+    "and passing 'copy=False' raises an error when a zero-copy NumPy array "
+    "is not possible, Pandas will follow this behavior starting with "
+    "version 3.0. This conversion to NumPy requires a copy, but "
+    "'copy=False' was passed. Consider using 'np.asarray(..)' instead."
+    with tm.assert_produces_warning(FutureWarning, match=msg):
         np.array(arr, copy=False)
 
     # except when there are actually no sparse filled values

pandas/tests/base/test_conversion.py

@@ -380,8 +380,12 @@ def test_to_numpy(arr, expected, zero_copy, index_or_series_or_array):
         return
 
     if not zero_copy:
-        with pytest.raises(ValueError, match="Unable to avoid copy while creating"):
-            # An error is always acceptable for `copy=False`
+        msg = "Starting on NumPy 2.0, the behavior of the 'copy' keyword has changed "
+        "and passing 'copy=False' raises an error when a zero-copy NumPy array "
+        "is not possible, Pandas will follow this behavior starting with "
+        "version 3.0. This conversion to NumPy requires a copy, but "
+        "'copy=False' was passed. Consider using 'np.asarray(..)' instead."
+        with tm.assert_produces_warning(FutureWarning, match=msg):
             np.array(thing, copy=False)
 
     else:

pandas/tests/extension/base/interface.py

@@ -82,11 +82,13 @@ def test_array_interface_copy(self, data):
             # copy=False semantics are only supported in NumPy>=2.
             return
 
-        try:
+        msg = "Starting on NumPy 2.0, the behavior of the 'copy' keyword has changed "
+        "and passing 'copy=False' raises an error when a zero-copy NumPy array "
+        "is not possible, Pandas will follow this behavior starting with "
+        "version 3.0. This conversion to NumPy requires a copy, but "
+        "'copy=False' was passed. Consider using 'np.asarray(..)' instead."
+        with tm.assert_produces_warning(FutureWarning, match=msg):
             result_nocopy1 = np.array(data, copy=False)
-        except ValueError:
-            # An error is always acceptable for `copy=False`
-            return
 
         result_nocopy2 = np.array(data, copy=False)
         # If copy=False was given and did not raise, these must share the same data

pandas/tests/indexes/multi/test_conversion.py

@@ -47,7 +47,12 @@ def test_array_interface(idx):
         return
 
     # for MultiIndex, copy=False is never allowed
-    with pytest.raises(ValueError, match="Unable to avoid copy while creating"):
+    msg = "Starting on NumPy 2.0, the behavior of the 'copy' keyword has changed "
+    "and passing 'copy=False' raises an error when a zero-copy NumPy array "
+    "is not possible, Pandas will follow this behavior starting with "
+    "version 3.0. This conversion to NumPy requires a copy, but "
+    "'copy=False' was passed. Consider using 'np.asarray(..)' instead."
+    with tm.assert_produces_warning(FutureWarning, match=msg):
         np.array(idx, copy=False)