Update basis equivalence test to be more specific #6532
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This commit updates the basis translator test: test_skip_target_basis_equivalences_1 to be more speific to the case it was designed to test. It was originally added in Qiskit#6369 as a dedicated reproduce test to validate we fixed issue Qiskit#6350 where the basis translator was trying to translate a gate already in the basis set which resulted in a less than ideal (but still valid) output circuit. However, this test was written to just mirror the original issue which was part of a larger workflow and is too broad for a dedicated test case. This is primarily because it was running a full transpile against a backend with the sabre swap routing pass instead of only running the basis translator (which is what we're testing). To fix this issue with the test this commit extracts the qasm from the transpilation into the basis translator when running the full reproduce from the original issue and uses that as the input circuit, then the test is updated to only run basis translation and optimization instead of the full transpilation against a backend. This makes the test more targetted to what it's specifically for and stable against unrelated changes to the sabre swap pass.
boschmitt
approved these changes
Jun 11, 2021
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Summary
This commit updates the basis translator test:
test_skip_target_basis_equivalences_1 to be more speific to the case it
was designed to test. It was originally added in #6369 as a dedicated
reproduce test to validate we fixed issue #6350 where the basis
translator was trying to translate a gate already in the basis set which
resulted in a less than ideal (but still valid) output circuit. However,
this test was written to just mirror the original issue which was part
of a larger workflow and is too broad for a dedicated test case. This is
primarily because it was running a full transpile against a backend with
the sabre swap routing pass instead of only running the basis
translator (which is what we're testing). To fix this issue with the
test this commit extracts the qasm from the transpilation into the basis
translator when running the full reproduce from the original issue and
uses that as the input circuit, then the test is updated to only run
basis translation and optimization instead of the full transpilation
against a backend. This makes the test more targetted to what it's
specifically for and stable against unrelated changes to the sabre swap
pass.
Details and comments
This was extracted from #6302 because the same issue I hit with this test in that PR @boschmitt also encountered in #6498