Add test_eventplot to test_datetime.py

[shriyakalakata]

PR summary

I have added a datetime smoke test/example code under the test_eventplot method in lib/matplotlib/test/test_datetime.py. This addresses the Axes.eventplot task from #26864.

(edited) The plots generated from the latest test code:

PR checklist

• "closes task Axes.eventplot in [TST]: increase unit test coverage  #26864" [link the related issue]
• new and changed code is tested
• Plotting related features are demonstrated in an example
• [N/A] New Features and API Changes are noted with a directive and release note
• [N/A] Documentation complies with general and docstring guidelines

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[QuLogic]

On a side note, you should probably set your email address in your git config. The first commit is using a random DHCP-supplied hostname from NYU, and the second is using your default macbook hostname.

[ksunden]

I think we may wish to add a testcase which exercise the units behavior on the y axis (i.e. lineoffset and linelength params, set to datetime and timedelta, respectively)

While I think the test cases here are perfectly good for the more ordinary use of eventplot, checking that those do the sensible thing is part of what we want.

[shriyakalakata]

I think we may wish to add a testcase which exercise the units behavior on the y axis (i.e. line offset and linelength params, set to datetime and timedelta, respectively)

I'm able to use datetime for lineoffset on the y axis but seems like linelength can't be of type timedelta

[QuLogic]

I'm able to use datetime for lineoffset on the y axis but seems like linelength can't be of type timedelta

I've opened #27479 to track this.

[ksunden]

Since linelengths is not well supported (and we have an issue to track getting it supported) I'll go ahead and approve this for what it is. We can edit it to include linelengths as timedeltas when that has been addressed.

[QuLogic]

Thanks @shriyakalakata! Congratulations on your first PR to Matplotlib 🎉 We hope to hear from you again.