[MacPorts] #56016: make test uses the installed version of MacPorts, not the just-built one

[MacPorts]

#56016: make test uses the installed version of MacPorts, not the just-built one
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  Reporter:  ryandesign  |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.4.99
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 I figured we knew about it since the buildbot installs before testing.

 Is there a way we could check in `make test` if `make install` has been
 run, and if not, error out an tell the user to install? Would be better
 than failing in weird ways.

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Ticket URL: <https://trac.macports.org/ticket/56016#comment:2>
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