Github tag relation to Concrete version number

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Hi everyone,

I have a number of add-ons in the Marketplace and am working on writing unit tests. In order to this I need to require Concrete5 in the composer.json of my add-ons but of course I need the proper version of Concrete5 for this (the Concrete5 version I would be installing the add-on in). I had expected the tags in Github (https://github.com/concrete5/composer) to correspond to the versions of Concrete 5 but they don't. I don't see how it's possible to install a specific version of Concrete5 with Composer. Does anyone have any ideas?

Justin1978