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The cluster-autoscaler and kubevirt-cloud-provider image builds ran go build only, and go build never compiles a _test.go, so nothing ran the tests of the code the patches change. Run go test in the builder stage on the packages the patches touch. The list is read from the patches themselves, so a new patch is covered without an edit to the Dockerfile. Both builder stages export GOOS and GOARCH for the target, so the tests unset them: a local make image builds amd64 and arm64 by default, and a test binary for the other architecture runs on the build host only under binfmt emulation. The first run of that step on cluster-autoscaler found the carried downscale patch out of step with the upstream tests it leaves in place: SetSize no longer refuses a size above maxSize, while one case of TestNodeGroupIncreaseSizeErrors still expected that refusal. The patch now drops that case, and carries a test for the downscale it is named for instead. DeleteNodes lowers a group one node at a time through SetSize, so with the refusal in place a group standing above its max size could not shed a node at all. The new test deletes a node from such a group and expects the replica count to drop; against the unpatched SetSize it fails with the refusal the patch removes. Scale-up past maxSize stays bounded by the core scale-up orchestrator, which skips a node group already at MaxSize. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <f@lex.la>