Fix how the test host app is made into a .app (#529)
Fix how the test host app is made into a .app (#529)

In the previous was we would `rstrip` the test_host's app extension. If this happened to be the same as the end of the app name it would strip that too.
For example if it was `Foo-App.app` it would change to `Foo-A.app`.

This updates to take whatever is before the app extension by splitting the test_host's extension + '.' and taking the first entry.

Signed-off-by: dostrander <afed1613c66ca419a0349fcd3505a8dfe665ba29@gmail.com>
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