✨ Structured args in Testing #1541
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This should make it a bit easier to manage argument overrides than the
set of templates we have now, especially while we wait for
componentconfig to be everywhere.
Arguments can be defaulted, and those defaults can be overriden or
appended to, and then finally render to a slice of strings to be passed
as arguments and such.
This should make it easier to configure the API server without needing
to splat out the existing default arguments, maybe splice some stuff
out, etc.
For example:
```go
apiServer.Configure().
Disable("insecure-port").
Append("vmodule", "httplog.go=10").
Set("v", "5")
```
This converts the internal testing package to use structured arguments, introducing a new helper to preserve compat when specifying legacy args.
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This was referenced Jun 16, 2021
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This adds structured arguments to the testing package, deprecating the old style where we do templating in favor of a fluent API with defaults that can be overridden.
This should make it easier for consumers to override individual arguments while not breaking the necessary flags that are required for the API server to function, and should make it easier for us to deal with upcoming changes in the k8s API server that requiring setting flags in some conditions, but not in others that are unrelated to the value of the flag (e.g. certain flags must be passed for older versions, but must NOT be passed for newer versions).
The new API looks roughly like:
There's also a helper to merge the new arguments with the older style ones. To preserve existing behavior, if the end user explicitly passes a template, we'll consider those to be the "defaults", otherwise we'll use our normal new default logic.
Depends on #1540
Part of #1486