raft: properly setup BenchmarkStatus

This commit properly sets up BenchmarkStatus so that the leader
organically steps up and knows about all the followers. This way,
calls like LeadSupportUntil will be actually calculated.

References: #137264

Release note: None

pkg/raft/raft_test.go

@@ -5217,6 +5217,7 @@ func SetRandomizedElectionTimeout(r *RawNode, v int64) {
 // testConfigModifiers allows callers to optionally modify newTestConfig.
 type testConfigModifiers struct {
 	testingStoreLiveness raftstoreliveness.StoreLiveness
+	testingLogger        raftlogger.Logger
 }
 
 // testConfigModifierOpt is the type of an optional parameter to newTestConfig
@@ -5235,6 +5236,13 @@ func withStoreLiveness(storeLiveness raftstoreliveness.StoreLiveness) testConfig
 	}
 }
 
+// withLogger explicitly uses the supplied raft logger.
+func withLogger(logger raftlogger.Logger) testConfigModifierOpt {
+	return func(modifier *testConfigModifiers) {
+		modifier.testingLogger = logger
+	}
+}
+
 func newTestConfig(
 	id pb.PeerID, election, heartbeat int64, storage Storage, opts ...testConfigModifierOpt,
 ) *Config {
@@ -5248,6 +5256,14 @@ func newTestConfig(
 	} else {
 		storeLiveness = raftstoreliveness.AlwaysLive{}
 	}
+
+	var logger raftlogger.Logger
+	if modifiers.testingLogger != nil {
+		logger = modifiers.testingLogger
+	} else {
+		logger = raftlogger.DefaultRaftLogger
+	}
+
 	return &Config{
 		ID:              id,
 		ElectionTick:    election,
@@ -5256,6 +5272,7 @@ func newTestConfig(
 		MaxSizePerMsg:   noLimit,
 		MaxInflightMsgs: 256,
 		StoreLiveness:   storeLiveness,
+		Logger:          logger,
 		CRDBVersion:     cluster.MakeTestingClusterSettings().Version,
 		Metrics:         NewMetrics(),
 	}

pkg/raft/rawnode_test.go

@@ -887,13 +887,16 @@ func BenchmarkStatus(b *testing.B) {
 		for i := range peers {
 			peers[i] = pb.PeerID(i + 1)
 		}
-		cfg := newTestConfig(1, 3, 1, newTestMemoryStorage(withPeers(peers...)))
-		cfg.Logger = raftlogger.DiscardLogger
-		r := newRaft(cfg)
-		r.becomeFollower(1, 1)
-		r.becomeCandidate()
-		r.becomeLeader()
-		return &RawNode{raft: r}
+
+		raftPeers := make([]stateMachine, members)
+		for i := range raftPeers {
+			raftPeers[i] = newTestRaft(pb.PeerID(i+1), 10, 1, newTestMemoryStorage(withPeers(peers...)),
+				withLogger(raftlogger.DiscardLogger))
+		}
+
+		tt := newNetworkWithConfig(nil, raftPeers...)
+		tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
+		return &RawNode{raft: raftPeers[0].(*raft)}
 	}
 
 	for _, members := range []int{1, 3, 5, 100} {