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From Marc Weil <>
Subject Re: airflow testing: hovercraft
Date Fri, 23 Jun 2017 18:19:30 GMT
Hey Gerard,

Thanks for sharing this! It looks like a really solid idea, and I'm looking
forward to seeing where you take it. By chance, are there any docs or
examples you've been able to write yet?


Marc Weil | Lead Engineer | Growth Automation, Marketing, and Engagement |
New Relic

On Mon, Jun 19, 2017 at 11:13 PM, Gerard Toonstra <>

> Hi all,
> I  was talking about a dev project I was working on and there's some
> progress:
> There are two types of tests:
> 1. behavior tests:  These test the behavior of operators against a stubbed
> out "hook", which is driven through python "behave" scripts. The behave
> script reads a bit easier, shows the data and is used to test the behavior
> of operators against stubbed out versions of hooks.
> 2. hook tests: these draw in docker containers with popular databases and
> then test the hook methods against them. There's a provisioning system for
> these containers using yaml files, where you can tweak, reconfigure and
> load the containers with other data if that is required. This part is still
> very immature, but I hope it shows the potential.  There are currently
> single method tests for hive, s3, samba, ftps, mssql, mysql and postgres.
> The docker containers are managed through "hovertools", which I split out,
> because it can be reused when testing dags end-to-end. For a dag, you can
> use the tools to reset containers prior to triggering the DAG.
> I found 3 issues in airflow hooks along the way:
> - FTPSHook doesn't get initialized correctly (could be related to python3),
> the socket doesn't get wrapped and the connection fails. At least in my
> testing.
> - The samba hook uses an implementation of smb that's not been updated
> since 2012 and fails on a string/bytes encoding issue.
> - The s3 hook couldn't connect to a custom port to faciliate this testing.
> Best regards,
> Gerard

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