Github user jacksontj commented on the pull request: https://github.com/apache/trafficserver/pull/163#issuecomment-71565910 TSQA, although used by these tests, aren't only useful in this setting. For example, we use them already for testing our internal plugins and some internal builds. Since that is the case I need to install specific versions of TSQA that are dictated by my set of tests-- not necessarily the version of the TSQA that is tied to the version of ATS that I am running. We could work around this by creating a separate tagging scheme in the trafficserver source code, but that still gets messy since people who want to install the dep would have to not only know this other tagging scheme, but would also have to know which subdir to install from. As a separate repo we can iterate on tsqa (the library code) independently of the ATS source tree, while still keeping it a part of the project. Its basically the same reason that we don't pull in the source for "python requests" just because its used by the tests.
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