Add a unit tests and missing flags in etcd help.

Signed-off-by: ishan16696 <ishan.tyagi@sap.com>

server/etcdmain/config_test.go

@@ -15,6 +15,7 @@
 package etcdmain
 
 import (
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"net/url"
@@ -23,6 +24,7 @@ import (
 	"strings"
 	"testing"
 
+	"go.etcd.io/etcd/pkg/v3/flags"
 	"go.etcd.io/etcd/server/v3/embed"
 	"sigs.k8s.io/yaml"
 )
@@ -496,6 +498,21 @@ func TestConfigFileElectionTimeout(t *testing.T) {
 	}
 }
 
+func TestFlagsPresentInHelp(t *testing.T) {
+	cfg := newConfig()
+	cfg.cf.flagSet.VisitAll(func(f *flag.Flag) {
+		if _, ok := f.Value.(*flags.IgnoredFlag); ok {
+			// Ignored flags do not need to be in the help
+			return
+		}
+
+		flagText := fmt.Sprintf("--%s", f.Name)
+		if !strings.Contains(flagsline, flagText) && !strings.Contains(usageline, flagText) {
+			t.Errorf("Neither flagsline nor usageline in help.go contains flag named %s", flagText)
+		}
+	})
+}
+
 func mustCreateCfgFile(t *testing.T, b []byte) *os.File {
 	tmpfile, err := ioutil.TempFile("", "servercfg")
 	if err != nil {

server/etcdmain/help.go

@@ -20,6 +20,7 @@ import (
 
 	cconfig "go.etcd.io/etcd/server/v3/config"
 	"go.etcd.io/etcd/server/v3/embed"
+	"go.etcd.io/etcd/server/v3/etcdserver/api/rafthttp"
 	"golang.org/x/crypto/bcrypt"
 )
 
@@ -84,6 +85,8 @@ Member:
     Maximum client request size in bytes the server will accept.
   --max-concurrent-streams 'math.MaxUint32'
     Maximum concurrent streams that each client can open at a time.
+  --enable-grpc-gateway
+    Enable GRPC gateway.
   --grpc-keepalive-min-time '5s'
     Minimum duration interval that a client should wait before pinging server.
   --grpc-keepalive-interval '2h'
@@ -93,7 +96,11 @@ Member:
   --socket-reuse-port 'false'
     Enable to set socket option SO_REUSEPORT on listeners allowing rebinding of a port already in use.
   --socket-reuse-address 'false'
-	Enable to set socket option SO_REUSEADDR on listeners allowing binding to an address in TIME_WAIT state.
+    Enable to set socket option SO_REUSEADDR on listeners allowing binding to an address in TIME_WAIT state.
+  --raft-read-timeout '` + rafthttp.DefaultConnReadTimeout.String() + `'
+    Read timeout set on each rafthttp connection
+  --raft-write-timeout '` + rafthttp.DefaultConnWriteTimeout.String() + `'
+    Write timeout set on each rafthttp connection
 
 Clustering:
   --initial-advertise-peer-urls 'http://localhost:2380'
@@ -145,6 +152,10 @@ Security:
     Path to the client server TLS key file.
   --client-cert-auth 'false'
     Enable client cert authentication.
+  --client-cert-file ''
+    Path to an explicit peer client TLS cert file otherwise cert file will be used when client auth is required.
+  --client-key-file ''
+    Path to an explicit peer client TLS key file otherwise key file will be used when client auth is required.
   --client-crl-file ''
     Path to the client certificate revocation list file.
   --client-cert-allowed-hostname ''
@@ -167,6 +178,10 @@ Security:
     Allowed TLS hostname for inter peer authentication.
   --peer-auto-tls 'false'
     Peer TLS using self-generated certificates if --peer-key-file and --peer-cert-file are not provided.
+  --peer-client-cert-file ''
+    Path to an explicit peer client TLS cert file otherwise peer cert file will be used when client auth is required.
+  --peer-client-key-file ''
+    Path to an explicit peer client TLS key file otherwise peer key file will be used when client auth is required.
   --self-signed-cert-validity '1'
     The validity period of the client and peer certificates that are automatically generated by etcd when you specify ClientAutoTLS and PeerAutoTLS, the unit is year, and the default is 1.
   --peer-crl-file ''
@@ -257,6 +272,10 @@ Experimental feature:
     Skip verification of SAN field in client certificate for peer connections.
   --experimental-watch-progress-notify-interval '10m'
     Duration of periodical watch progress notification.
+  --experimental-downgrade-check-time
+    Duration of time between two downgrade status checks.
+  --experimental-memory-mlock
+    Enable to enforce etcd pages (in particular bbolt) to stay in RAM.
   --experimental-warning-apply-duration '100ms'
 	Warning is generated if requests take more than this duration.
   --experimental-txn-mode-write-with-shared-buffer 'true'