Unittest not running because `QiskitTestCase` class is removed in Qiskit 1.0.

[sim-eng-ii]

Information

• Qiskit Cold atoms version:latest
• Python version: Python 3.12.3
• Operating system: macOS

What is the current behavior?

As per issue #97, the qiskit-terra (>=0.17.1) dependencies need to be removed. I have also noticed that the unittest files depend on the qiskit.test class QiskitTestCase, which is not available in Qiskit 1.0 and beyond.

Steps to reproduce the problem

• Create a virtual environment
• Install the latest version of Qiskit 1.0 and necessary qiskit libraries (e.g. qiskit_are, qiskit-nature, qiskit-algorithms)
• Update lines 26 and 27 of qiskit_cold_atom/applications/time_evolution_solver.py to:

            from qiskit_algorithms import TimeEvolutionProblem
            from qiskit_algorithms.time_evolvers import TrotterQRTE

(this change will ensure the use of the qiskit-algorithm rather than the deprecated qiskit.algorithm.

• run python -m unittest in the root folder
• The error displayed is:

            From qiskit.test import QiskitTestCase
        ModuleNotFoundError: No module named 'qiskit.test'

This is because qiskit.test class QiskitTestCase is not defined in Qiskit 1.0

What is the expected behavior?

Unittests should run and either pass or fail.

Suggested solutions

[update at on 3/09/24 at 16:43GMT on possible solution]

• remove qiskit.test from qiskit-cold-atom and use an alternative method

I think this problem should be addressed before (or while) resolving issue #97

[1ucian0]

Indeed, QiskitTestCase was removed in Qiskit/qiskit#11445. It can probably just be replaced by unittest.TestCase.

[sim-eng-ii]

Hello @1ucian0 okay! I will try this and open a PR when done.

[sim-eng-ii]

Hello, @1ucian0 is there any documentation explaining how to substitute iteration of CircuitInstruction in Qiskit 2.0 using the operation, qubits and clbits named attributes? I am searching for it but cannot find it anywhere.

update:I was able to find the documentation and I think I resolved the problem.

[1ucian0]

I think I resolved the problem.

Great! want to push somewhere? I could have a look.

[sim-eng-ii]

Hello, I only fixed that particular issue, I still have some others to solve (I will also need to review the formatting before opening a PR). They will all be on this branch

https://github.com/robotAstray/qiskit-cold-atom/tree/fix-qiskit-terra-dependencies

[sim-eng-ii]

@1ucian0 Since we need to move from BackendV1 to BackendV2, some changes are necessary in the definition of the class FermionSimulator(), which inherits from the class BaseFermionBackend(), which takes a BackendV2 as an argument.
FermionSimlutor will need two additional methods:

1. def max_circuits()
2. def target()

What would be the requirements for (1) and the instructions for (2)?

something like the code used elsewhere?

    @property
    def max_circuits(self) -> None:
        return None

    @property
    def target(self) -> Target:
        if not self._target:
            self._target = self._build_basic_target()
        return self._target

update: these methods should also be implemented in class SpinSimulator.

(I plan to resolve both issue #98 and issue #97 in one PR)