Don't test forward compatibility in qpy compat tests (backport #11101)#11150
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* Don't test forward compatibility in qpy compat tests The qpy compatibility tests are designed to test backwards compatibility. They generate QPY files using all historical releases of Qiskit with QPY support and test that all proposed changes are able to load the qpy files. There was an underlying assumption to how the tests were written that the version under test is always newer than all the historical releases. This has been true in the past because the release model for qiskit mean that we were maintaining at most one stable release at a time, and when we released a new minor version of qiskit we retired the previous minor version release series's branch. However, moving forward this assumption will no longer be true as we're moving to a model where we support > 1 branch at a time. When we start supporting > 1 release series at a time, PRs proposed to the older stable branches will no longer be able to test all releases because QPY only support backwards compatibility and will not be able to load QPY files generated from newer releases. The example of this was in the 0.25.x series, there is overlap in the support of the stable/0.25 branch and the stable/0.45 branch, and after the release of 0.45.0rc1 the tests started to fail because you can't load QPY files generated with 0.45.0rc1 with 0.25.x. This commit address this by adding a condition to the QPY compat scripts to ensure that the version under test is >= the QPY file source version. If we encounter that scenario we just skip the tests. This should prevent this situation from occurring for future releases as we expand our support windows. * Fix syntax errors * Use a Python script to compare versions This commit adds a small python script to compare two version strings and determine whether the version under test is newer (or the same) as the source version. The logic for making this determination was a bit more involved in bash, so using a python script lets us reuse the regex built into qpy's interface to support this comparison already. * Fix lint * Fix return code with invalid version This commit fixes the return code generation if an invalid comparison is requested. We want to handle this with a 0 return code to treat it as a skip, but the previous logic would error before we evaluated the if statement. Co-authored-by: Jake Lishman <jake.lishman@ibm.com> --------- Co-authored-by: Jake Lishman <jake.lishman@ibm.com> (cherry picked from commit 2b5503c)
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Oct 30, 2023
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This is an automatic backport of pull request #11101 done by Mergify.
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