Add sequence / integration tests

[schuenke]

This is still work in progress. More tests will be added.

[FrankZijlstra]

I've attempted to add the example sequence tests (and some bugfixes to make the tests pass) to this PR. I also reworked the tests into a TestSequence class that avoids recreating the sequence multiple times (important for the more CPU-intensive sequence examples).

The tests run into an issue where it can't find the examples folder... Locally this works fine by adding the parent directory to sys.path, but on github this fails. Any thoughts @schuenke ? An alternative would be to move the sequence examples back into the main package...

Besides this:

• I think the Approx class should be taken out of test_sequence.py, it is a utility that could be of use in other tests (it extends pytest.approx to also work recursively on lists, dicts and SimpleNamespaces).
• I believe we should not ignore all warnings in the tests. For example, one of the sequence examples had timing errors, that now get checked by write_seq and give a warning. I'm not sure I understand the reason to give a UserWarning for the default duration of make_block_pulse. But it's easily avoided by specifying a duration.

[schuenke]

The tests run into an issue where it can't find the examples folder... Locally this works fine by adding the parent directory to sys.path, but on github this fails. Any thoughts @schuenke ? An alternative would be to move the sequence examples back into the main package...

The path problem should be fixed. Now it's "just" some AssertionErrors left. Maybe you can have a look again @FrankZijlstra? Reading your code comments I have the impression that you already spent some time on the write -> read issue 😄

[FrankZijlstra]

The path problem should be fixed. Now it's "just" some AssertionErrors left. Maybe you can have a look again @FrankZijlstra? Reading your code comments I have the impression that you already spent some time on the write -> read issue 😄

It looks like all tests are running the same sequence (with TotalDuration 0.64). I think test_func gets overwritten?