diff --git a/test/dynamics/common.py b/test/dynamics/common.py
index ec8cd5115..11bdf26e7 100644
--- a/test/dynamics/common.py
+++ b/test/dynamics/common.py
@@ -54,7 +54,7 @@
 
 from qiskit_dynamics import DYNAMICS_NUMPY_ALIAS
 
-from qiskit_dynamics.array import Array, wrap
+from qiskit_dynamics.array import Array
 
 
 def _is_sparse_object_array(A):
@@ -336,53 +336,3 @@ def setUpClass(cls):
                 import qutip  # pylint: disable=import-outside-toplevel,unused-import
         except Exception as err:
             raise unittest.SkipTest("Skipping qutip tests.") from err
-
-
-# to be removed for 0.5.0
-class TestJaxBase(unittest.TestCase):
-    """Base class with setUpClass and tearDownClass for setting jax as the
-    default backend.
-
-    Test cases that inherit from this class will automatically work with jax
-    backend.
-    """
-
-    @classmethod
-    def setUpClass(cls):
-        try:
-            # pylint: disable=import-outside-toplevel
-            import jax
-
-            jax.config.update("jax_enable_x64", True)
-            jax.config.update("jax_platform_name", "cpu")
-        except Exception as err:
-            raise unittest.SkipTest("Skipping jax tests.") from err
-
-        Array.set_default_backend("jax")
-
-    @classmethod
-    def tearDownClass(cls):
-        """Set numpy back to the default backend."""
-        Array.set_default_backend("numpy")
-
-    def jit_wrap(self, func_to_test: Callable) -> Callable:
-        """Wraps and jits func_to_test.
-        Args:
-            func_to_test: The function to be jited.
-        Returns:
-            Wrapped and jitted function."""
-        wf = wrap(jit, decorator=True)
-        return wf(wrap(func_to_test))
-
-    def jit_grad_wrap(self, func_to_test: Callable) -> Callable:
-        """Tests whether a function can be graded. Converts
-        all functions to scalar, real functions if they are not
-        already.
-        Args:
-            func_to_test: The function whose gradient will be graded.
-        Returns:
-            JIT-compiled gradient of function.
-        """
-        return wrap(lambda f: jit(grad(f)), decorator=True)(
-            lambda *args: np.sum(func_to_test(*args)).real
-        )
diff --git a/test/dynamics/signals/test_signals_algebra.py b/test/dynamics/signals/test_signals_algebra.py
index 434046756..0bb98f2b5 100644
--- a/test/dynamics/signals/test_signals_algebra.py
+++ b/test/dynamics/signals/test_signals_algebra.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-# pylint: disable=invalid-name
+# pylint: disable=invalid-name,no-member
 
 """
 Tests for algebraic operations on signals.
@@ -19,7 +19,7 @@
 
 from qiskit_dynamics.signals import Signal, DiscreteSignal, SignalSum, DiscreteSignalSum
 
-from ..common import QiskitDynamicsTestCase, TestJaxBase
+from ..common import test_array_backends, JAXTestBase
 
 try:
     from jax import jit, grad
@@ -28,7 +28,8 @@
     pass
 
 
-class TestSignalAddition(QiskitDynamicsTestCase):
+@test_array_backends
+class TestSignalAddition:
     """Testing special handling of signal addition."""
 
     def test_SignalSum_construction(self):
@@ -81,7 +82,8 @@ def test_scalar_addition(self):
         self.assertAllClose(sig_sum.envelope(1.5), np.array([3.0, -1.0]))
 
 
-class TestSignalMultiplication(QiskitDynamicsTestCase):
+@test_array_backends
+class TestSignalMultiplication:
     """Test special handling of signal multiplication."""
 
     def test_DiscreteSignal_products(self):
@@ -198,15 +200,7 @@ def test_signal_signal_product(self):
         self.assertAllClose(sig_prod(t_vals), expected)
 
 
-class TestSignalAdditionJax(TestSignalAddition, TestJaxBase):
-    """Jax version of TestSignalAddition."""
-
-
-class TestSignalMultiplicationJax(TestSignalMultiplication, TestJaxBase):
-    """Jax version of TestSignalMultiplication."""
-
-
-class TestSignalAlgebraJaxTransformations(QiskitDynamicsTestCase, TestJaxBase):
+class TestSignalAlgebraJaxTransformations(JAXTestBase):
     """Test cases for jax transformations through signal algebraic operations."""
 
     def setUp(self):
diff --git a/test/dynamics/solvers/test_dyson_magnus_solvers.py b/test/dynamics/solvers/test_dyson_magnus_solvers.py
index f1b5b780d..dec10154c 100644
--- a/test/dynamics/solvers/test_dyson_magnus_solvers.py
+++ b/test/dynamics/solvers/test_dyson_magnus_solvers.py
@@ -354,7 +354,7 @@ def setUp(self):
 
     @classmethod
     def setUpClass(cls):
-        # calls TestJaxBase setUpClass
+        # calls JAXTestBase setUpClass
         super().setUpClass()
         # builds common objects
         Test_PerturbativeSolver.build_testing_objects(cls, integration_method="jax_odeint")
diff --git a/test/dynamics/test_jax_transformations.py b/test/dynamics/test_jax_transformations.py
index 7c3f03a34..feb59eefa 100644
--- a/test/dynamics/test_jax_transformations.py
+++ b/test/dynamics/test_jax_transformations.py
@@ -22,7 +22,7 @@
 from qiskit_dynamics.signals import Signal
 from qiskit_dynamics import solve_lmde
 
-from .common import TestJaxBase
+from .common import JAXTestBase
 
 try:
     from jax import jit, grad
@@ -32,7 +32,7 @@
     pass
 
 
-class TestJaxTransformations(TestJaxBase):
+class TestJaxTransformations(JAXTestBase):
     """Class for testing jax transformations of integrated use cases."""
 
     def setUp(self):