Implement basic provider upgrade testing #194
Merged
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Fixes #175
Detect unexpected replace plans to prevent issues such as #173
See pulumi/pulumi-random#263 for prior art.
There is a lot of helper code temporarily included here (and also in pulumi-random) because we're out of time to properly figure out pulumi/pulumi#12125 - ideally the upgrade-style testing would be an easy to use feature of ProgramTest or similar framework and not require any helper code in providers.