Capture and playback of events for testing #32
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Add a small package `mtime` which will return a defined value in place of `time.Now()`, so that tests which depend on timing can be repeated.
Needed for object capture used in testing
So we can record a sequence of inputs then create unit tests by playing them back.
Actually it is capturing every version fetched. This code is temporary; will be replaced in a subsequent commit with a version that only outputs the first version seen as 'initial'.
Read object updates and events from a file and play them back as if they came from Kubernetes, for testing.
Essentially the test is the same, but with data captured using the new framework. Test data is now in a yaml file rather than Go code.
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So we can record a sequence of inputs (coming from k8s api-server) then create unit tests by playing them back.
Note the "capture initial state" code in this PR is incomplete, because #2 has a better way of doing it but I am merging the work done for #2 in stages.