open-consul/agent/proxycfg/snapshot_test.go

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package proxycfg
import (
"context"
"regexp"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
fuzz "github.com/google/gofuzz"
"github.com/hashicorp/consul/proto/pbpeering"
)
func TestConfigSnapshot_Clone(t *testing.T) {
// ConfigSnapshot is a complex struct that (directly or indirectly) has a copy
// of most of the structs in the agent/structs package. It'd be easy to break
// the Clone method accidentally by changing one of those distant structs, so
// we test it by using a fuzzer to traverse the graph and fill every field and
// then compare the original to the copy.
f := fuzz.New()
f.NilChance(0)
f.NumElements(1, 3)
f.SkipFieldsWithPattern(regexp.MustCompile("^ServerSNIFn$"))
f.Funcs(
// Populate map[string]interface{} since gofuzz panics on these. We force them
// to be any rather than concrete types otherwise they won't compare equal when
// coming back out the other side.
func(m map[string]any, c fuzz.Continue) {
m[c.RandString()] = any(float64(c.RandUint64()))
m[c.RandString()] = any(c.RandString())
m[c.RandString()] = any([]any{c.RandString(), c.RandString()})
m[c.RandString()] = any(map[string]any{c.RandString(): c.RandString()})
},
func(*context.CancelFunc, fuzz.Continue) {},
)
snapshot := new(ConfigSnapshot)
f.Fuzz(snapshot)
clone := snapshot.Clone()
diff := cmp.Diff(snapshot, clone,
cmpopts.IgnoreUnexported(indexedTarget{}),
cmpopts.IgnoreUnexported(pbpeering.PeeringTrustBundle{}),
cmpopts.IgnoreTypes(context.CancelFunc(nil)),
)
if diff != "" {
t.Logf("Copied snaspshot is different to the original. You may need to re-run `make deep-copy`.\nDiff:\n%s", diff)
t.FailNow()
}
}