diff --git a/src/array_api_extra/_delegation.py b/src/array_api_extra/_delegation.py
index 4a1740e6..c3d77f8e 100644
--- a/src/array_api_extra/_delegation.py
+++ b/src/array_api_extra/_delegation.py
@@ -77,7 +77,7 @@ def pad(
         pad_width = xp.flip(pad_width, axis=(0,)).flatten()
         return xp.nn.functional.pad(x, tuple(pad_width), value=constant_values)  # type: ignore[arg-type]  # pyright: ignore[reportArgumentType]
 
-    if _delegate(xp, Backend.NUMPY, Backend.JAX_NUMPY, Backend.CUPY):
+    if _delegate(xp, Backend.NUMPY, Backend.JAX, Backend.CUPY):
         return xp.pad(x, pad_width, mode, constant_values=constant_values)
 
     return _funcs.pad(x, pad_width, constant_values=constant_values, xp=xp)
diff --git a/src/array_api_extra/_lib/_backends.py b/src/array_api_extra/_lib/_backends.py
index ee2e051e..f044281a 100644
--- a/src/array_api_extra/_lib/_backends.py
+++ b/src/array_api_extra/_lib/_backends.py
@@ -28,9 +28,9 @@ class Backend(Enum):  # numpydoc ignore=PR01,PR02  # type: ignore[no-subclass-an
     NUMPY_READONLY = "numpy_readonly", _compat.is_numpy_namespace
     CUPY = "cupy", _compat.is_cupy_namespace
     TORCH = "torch", _compat.is_torch_namespace
-    DASK_ARRAY = "dask.array", _compat.is_dask_namespace
+    DASK = "dask.array", _compat.is_dask_namespace
     SPARSE = "sparse", _compat.is_pydata_sparse_namespace
-    JAX_NUMPY = "jax.numpy", _compat.is_jax_namespace
+    JAX = "jax.numpy", _compat.is_jax_namespace
 
     def __new__(
         cls, value: str, _is_namespace: Callable[[ModuleType], bool]
diff --git a/tests/conftest.py b/tests/conftest.py
index fa555018..fc2e68e2 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -104,7 +104,7 @@ def xp(library: Backend) -> ModuleType:  # numpydoc ignore=PR01,RT03
     if library == Backend.NUMPY_READONLY:
         return NumPyReadOnly()  # type: ignore[return-value]  # pyright: ignore[reportReturnType]
     xp = pytest.importorskip(library.value)
-    if library == Backend.JAX_NUMPY:
+    if library == Backend.JAX:
         import jax
 
         jax.config.update("jax_enable_x64", True)  # type: ignore[no-untyped-call]
diff --git a/tests/test_at.py b/tests/test_at.py
index c65a4a0d..84aa464c 100644
--- a/tests/test_at.py
+++ b/tests/test_at.py
@@ -34,7 +34,7 @@ def assert_copy(array: Array, copy: bool | None) -> Generator[None, None, None]:
 
 
 @pytest.mark.skip_xp_backend(
-    Backend.SPARSE, reason="read-only backend without .at support"
+    Backend.SPARSE, reason="sparse:read-only backend without .at support"
 )
 @pytest.mark.parametrize(
     ("kwargs", "expect_copy"),
diff --git a/tests/test_funcs.py b/tests/test_funcs.py
index 3557642b..692d486b 100644
--- a/tests/test_funcs.py
+++ b/tests/test_funcs.py
@@ -26,7 +26,7 @@
 # mypy: disable-error-code=no-untyped-usage
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no expand_dims")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no expand_dims")
 class TestAtLeastND:
     def test_0D(self, xp: ModuleType):
         x = xp.asarray(1.0)
@@ -98,7 +98,7 @@ def test_xp(self, xp: ModuleType):
         xp_assert_equal(y, x)
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no isdtype")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no isdtype")
 class TestCov:
     def test_basic(self, xp: ModuleType):
         xp_assert_close(
@@ -137,7 +137,9 @@ def test_device(self, xp: ModuleType, device: Device):
         x = xp.asarray([1, 2, 3], device=device)
         assert get_device(cov(x)) == device
 
-    @pytest.mark.skip_xp_backend(Backend.NUMPY_READONLY)
+    @pytest.mark.skip_xp_backend(
+        Backend.NUMPY_READONLY, reason="numpy_readonly:explicit xp"
+    )
     def test_xp(self, xp: ModuleType):
         xp_assert_close(
             cov(xp.asarray([[0.0, 2.0], [1.0, 1.0], [2.0, 0.0]]).T, xp=xp),
@@ -145,7 +147,7 @@ def test_xp(self, xp: ModuleType):
         )
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no device")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no device kwarg in asarray")
 class TestCreateDiagonal:
     def test_1d(self, xp: ModuleType):
         # from np.diag tests
@@ -191,10 +193,10 @@ def test_xp(self, xp: ModuleType):
         xp_assert_equal(y, xp.asarray([[1, 0], [0, 2]]))
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no sparse.expand_dims")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no expand_dims")
 class TestExpandDims:
-    @pytest.mark.skip_xp_backend(Backend.DASK_ARRAY, reason="tuple index out of range")
-    @pytest.mark.skip_xp_backend(Backend.TORCH, reason="tuple index out of range")
+    @pytest.mark.skip_xp_backend(Backend.DASK, reason="dask:tuple index out of range")
+    @pytest.mark.skip_xp_backend(Backend.TORCH, reason="torch:tuple index out of range")
     def test_functionality(self, xp: ModuleType):
         def _squeeze_all(b: Array) -> Array:
             """Mimics `np.squeeze(b)`. `xpx.squeeze`?"""
@@ -252,7 +254,7 @@ def test_xp(self, xp: ModuleType):
         assert y.shape == (1, 1, 1, 3)
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no sparse.expand_dims")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no expand_dims")
 class TestKron:
     def test_basic(self, xp: ModuleType):
         # Using 0-dimensional array
@@ -349,7 +351,9 @@ def test_xp(self, xp: ModuleType):
         xp_assert_equal(nunique(a, xp=xp), xp.asarray(3))
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no arange, no device")
+@pytest.mark.skip_xp_backend(
+    Backend.SPARSE, reason="sparse:no arange, no device kwarg in asarray"
+)
 class TestPad:
     def test_simple(self, xp: ModuleType):
         a = xp.arange(1, 4)
@@ -399,8 +403,8 @@ def test_list_of_tuples_width(self, xp: ModuleType):
         assert padded.shape == (4, 4)
 
 
-@pytest.mark.skip_xp_backend(Backend.DASK_ARRAY, reason="no argsort")
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no device")
+@pytest.mark.skip_xp_backend(Backend.DASK, reason="dask:no argsort")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no device kwarg in asarray")
 class TestSetDiff1D:
     @pytest.mark.skip_xp_backend(
         Backend.TORCH, reason="index_select not implemented for uint32"
@@ -436,7 +440,9 @@ def test_device(self, xp: ModuleType, device: Device):
         x2 = xp.asarray([2, 3, 4], device=device)
         assert get_device(setdiff1d(x1, x2)) == device
 
-    @pytest.mark.skip_xp_backend(Backend.NUMPY_READONLY)
+    @pytest.mark.skip_xp_backend(
+        Backend.NUMPY_READONLY, reason="numpy_readonly:explicit xp"
+    )
     def test_xp(self, xp: ModuleType):
         x1 = xp.asarray([3, 8, 20])
         x2 = xp.asarray([2, 3, 4])
@@ -445,7 +451,7 @@ def test_xp(self, xp: ModuleType):
         xp_assert_equal(actual, expected)
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no isdtype")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no isdtype")
 class TestSinc:
     def test_simple(self, xp: ModuleType):
         xp_assert_equal(sinc(xp.asarray(0.0)), xp.asarray(1.0))
diff --git a/tests/test_testing.py b/tests/test_testing.py
index e0ce66ad..41fc6673 100644
--- a/tests/test_testing.py
+++ b/tests/test_testing.py
@@ -17,7 +17,9 @@
         xp_assert_equal,
         pytest.param(
             xp_assert_close,
-            marks=pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no isdtype"),
+            marks=pytest.mark.skip_xp_backend(
+                Backend.SPARSE, reason="sparse:no isdtype"
+            ),
         ),
     ],
 )
@@ -38,15 +40,19 @@ def test_assert_close_equal_basic(xp: ModuleType, func: Callable[..., None]):  #
         func(xp.asarray([1, 2]), xp.asarray([1, 3]), err_msg="hello")
 
 
-@pytest.mark.skip_xp_backend(Backend.NUMPY)
-@pytest.mark.skip_xp_backend(Backend.NUMPY_READONLY)
+@pytest.mark.skip_xp_backend(Backend.NUMPY, reason="numpy:test other ns vs. numpy")
+@pytest.mark.skip_xp_backend(
+    Backend.NUMPY_READONLY, reason="numpy_readonly:test other ns vs. numpy"
+)
 @pytest.mark.parametrize(
     "func",
     [
         xp_assert_equal,
         pytest.param(
             xp_assert_close,
-            marks=pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no isdtype"),
+            marks=pytest.mark.skip_xp_backend(
+                Backend.SPARSE, reason="sparse:no isdtype"
+            ),
         ),
     ],
 )
@@ -59,7 +65,7 @@ def test_assert_close_equal_namespace(xp: ModuleType, func: Callable[..., None])
         func(xp.asarray([0]), [0])
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no isdtype")
+@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="sparse:no isdtype")
 def test_assert_close_tolerance(xp: ModuleType):
     xp_assert_close(xp.asarray([100.0]), xp.asarray([102.0]), rtol=0.03)
     with pytest.raises(AssertionError):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 981d5c03..f053f177 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -12,8 +12,10 @@
 
 
 class TestIn1D:
-    @pytest.mark.skip_xp_backend(Backend.DASK_ARRAY, reason="no argsort")
-    @pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no unique_inverse, no device")
+    @pytest.mark.skip_xp_backend(Backend.DASK, reason="dask:no argsort")
+    @pytest.mark.skip_xp_backend(
+        Backend.SPARSE, reason="sparse:no unique_inverse, no device kwarg in asarray"
+    )
     # cover both code paths
     @pytest.mark.parametrize("n", [9, 15])
     def test_no_invert_assume_unique(self, xp: ModuleType, n: int):
@@ -23,14 +25,20 @@ def test_no_invert_assume_unique(self, xp: ModuleType, n: int):
         actual = in1d(x1, x2)
         xp_assert_equal(actual, expected)
 
-    @pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no device")
+    @pytest.mark.skip_xp_backend(
+        Backend.SPARSE, reason="sparse: no device kwarg in asarray"
+    )
     def test_device(self, xp: ModuleType, device: Device):
         x1 = xp.asarray([3, 8, 20], device=device)
         x2 = xp.asarray([2, 3, 4], device=device)
         assert get_device(in1d(x1, x2)) == device
 
-    @pytest.mark.skip_xp_backend(Backend.NUMPY_READONLY)
-    @pytest.mark.skip_xp_backend(Backend.SPARSE, reason="no arange, no device")
+    @pytest.mark.skip_xp_backend(
+        Backend.NUMPY_READONLY, reason="numpy_readonly:explicit xp"
+    )
+    @pytest.mark.skip_xp_backend(
+        Backend.SPARSE, reason="sparse:no arange, no device kwarg in asarray"
+    )
     def test_xp(self, xp: ModuleType):
         x1 = xp.asarray([1, 6])
         x2 = xp.arange(5)