diff --git a/imops/_configs.py b/imops/_configs.py
index 61a1aaf7..4b81b2f6 100644
--- a/imops/_configs.py
+++ b/imops/_configs.py
@@ -1,30 +1,63 @@
+from functools import partial
 from itertools import product
 
 from .backend import Cupy, Cython, Numba, Scipy
 
 
-scipy_configs = [Scipy()]
-radon_configs = [Cython(fast) for fast in [False, True]]
-numeric_configs = [
-    Scipy(),
-    *[Cython(fast) for fast in [False, True]],
+scipy_backends = [Scipy]
+radon_backends = [partial(Cython, fast=fast) for fast in [False, True]]
+numeric_backends = [
+    Scipy,
+    *[partial(Cython, fast=fast) for fast in [False, True]],
 ]
-measure_configs = [
-    Scipy(),
-    *[Cython(fast) for fast in [False, True]],
+measure_backends = [
+    Scipy,
+    *[partial(Cython, fast=fast) for fast in [False, True]],
 ]
-morphology_configs = [
-    Scipy(),
-    *[Cython(fast) for fast in [False, True]],
+morphology_backends = [
+    Scipy,
+    *[partial(Cython, fast=fast) for fast in [False, True]],
 ]
-zoom_configs = [
-    Scipy(),
-    *[Cython(fast) for fast in [False, True]],
-    *[Numba(*flags) for flags in product([False, True], repeat=3)],
-    Cupy(),
+zoom_backends = [
+    Scipy,
+    *[partial(Cython, fast=fast) for fast in [False, True]],
+    *[partial(Numba, *flags) for flags in product([False, True], repeat=3)],
+    Cupy,
 ]
-interp1d_configs = [
-    Scipy(),
-    *[Cython(fast) for fast in [False, True]],
-    *[Numba(*flags) for flags in product([False, True], repeat=3)],
+interp1d_backends = [
+    Scipy,
+    *[partial(Cython, fast=fast) for fast in [False, True]],
+    *[partial(Numba, *flags) for flags in product([False, True], repeat=3)],
 ]
+
+
+def is_available(backend):
+    try:
+        backend()
+        return True
+    except ModuleNotFoundError:
+        return False
+
+
+def available_backends(backends):
+    return [backend for backend in backends if is_available(backend)]
+
+
+def to_repr(backend):
+    if not isinstance(backend, partial):
+        return backend
+
+    backend_name = backend.func.__name__
+    backend_args = ', '.join(map(str, backend.args))
+    backend_kwargs = ', '.join(f'{key}={value}' for key, value in backend.keywords.items())
+
+    if not backend_args:
+        if not backend_kwargs:
+            return backend_name
+        else:
+            return f'{backend_name}({backend_kwargs})'
+    else:
+        if not backend_kwargs:
+            return f'{backend_name}({backend_args})'
+
+    return f'{backend_name}({backend_args}, {backend_kwargs})'
diff --git a/tests/test_zoom.py b/tests/test_zoom.py
index 9cfc3d93..32a67304 100644
--- a/tests/test_zoom.py
+++ b/tests/test_zoom.py
@@ -6,7 +6,7 @@
 from numpy.testing import assert_allclose
 from scipy.ndimage import zoom as scipy_zoom
 
-from imops._configs import zoom_configs
+from imops._configs import available_backends, to_repr, zoom_backends
 from imops.backend import SINGLE_THREADED_BACKENDS, Backend
 from imops.utils import ZOOM_SRC_DIM, get_c_contiguous_permutaion, inverse_permutation, make_immutable
 from imops.zoom import _zoom, zoom, zoom_to_shape
@@ -32,9 +32,12 @@ class Alien1(Backend):
     pass
 
 
-@pytest.fixture(params=zoom_configs, ids=map(str, zoom_configs))
+tested_backends = available_backends(zoom_backends)
+
+
+@pytest.fixture(params=tested_backends, ids=map(to_repr, tested_backends))
 def backend(request):
-    return request.param
+    return request.param()
 
 
 @pytest.fixture(params=[0, 1])