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Although the current version of the notifier should work just fine against Go 1.12, the tests are failing due to some overly aggressive test assertions. This branch fixes broken tests and runs CI against Go 1.12.
The issue was that tests were asserting against which stackframes we saw internally from Go itself, which we have been lucky with for versions 1.7-1.11, but has had changes in Go 1.12. These were a bit too rigid, and instead we should just check that the stack frames do appear, but be a bit more relaxed as to where in the stack they are. I've created a utility function to do just that.