monitor command takes no args

rm extra new line

fix lint errors

return after close

fix, simplify test

command/agent/monitor/monitor_test.go

@@ -22,20 +22,23 @@ func TestMonitor_Start(t *testing.T) {
 	})
 
 	closeCh := make(chan struct{})
-	defer close(closeCh)
 
 	logCh := m.Start(closeCh)
+
 	go func() {
-		for {
-			select {
-			case log := <-logCh:
-				require.Contains(t, string(log), "[DEBUG] test log")
-			case <-time.After(1 * time.Second):
-				t.Fatal("Expected to receive from log channel")
-			}
-		}
+		logger.Debug("test log")
+		time.Sleep(10 * time.Millisecond)
 	}()
-	logger.Debug("test log")
+
+	for {
+		select {
+		case log := <-logCh:
+			require.Contains(t, string(log), "[DEBUG] test log")
+			return
+		case <-time.After(3 * time.Second):
+			t.Fatal("Expected to receive from log channel")
+		}
+	}
 }
 
 // Ensure number of dropped messages are logged
@@ -61,7 +64,6 @@ func TestMonitor_DroppedMessages(t *testing.T) {
 	}
 
 	received := ""
-
 	passed := make(chan struct{})
 	go func() {
 		for {

command/agent_monitor.go

@@ -74,6 +74,13 @@ func (c *MonitorCommand) Run(args []string) int {
 		return 1
 	}
 
+	args = flags.Args()
+	if l := len(args); l != 0 {
+		c.Ui.Error("This command takes no arguments")
+		c.Ui.Error(commandErrorText(c))
+		return 1
+	}
+
 	client, err := c.Meta.Client()
 	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))