🌱 fake-client: extend builder with an option to set a RESTMapper

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

This PR extends the fake client to make it possible to set a RESTMapper (e.g. a meta.DefaultRESTMapper).
This enables users of the fake client to write tests for funcs which use the REST mapping of a Client.

I encountered this limitation when I tried to implement a unit test in CAPI for a func which uses the REST mapping of the Client (or fake client in case of the unit test) to check if a resource is namespaced.

xref: https://github.com/kubernetes-sigs/cluster-api/pull/5383/files

[alvaroaleman]

thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, sbueringer

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [alvaroaleman]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sbueringer]

/cherrypick release-0.10

[k8s-infra-cherrypick-robot]

@sbueringer: cannot cherry-pick an unmerged PR

In response to this:

/cherrypick release-0.10

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sbueringer]

/cherrypick release-0.10

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #1686

In response to this:

/cherrypick release-0.10

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.