Mongodb should output 2 plugins in test mode

closes #336

CHANGELOG.md

@@ -14,6 +14,7 @@ changed to just run docker commands in the Makefile. See `make docker-run` and
 
 ### Bugfixes
 - [#331](https://github.com/influxdb/telegraf/pull/331): Dont overwrite host tag in redis plugin.
+- [#336](https://github.com/influxdb/telegraf/pull/336): Mongodb plugin should take 2 measurements.
 
 ## v0.2.0 [2015-10-27]
 

agent.go

@@ -314,7 +314,7 @@ func (a *Agent) Test() error {
 		// Special instructions for some plugins. cpu, for example, needs to be
 		// run twice in order to return cpu usage percentages.
 		switch plugin.name {
-		case "cpu":
+		case "cpu", "mongodb":
 			time.Sleep(500 * time.Millisecond)
 			fmt.Printf("* Plugin: %s, Collection 2\n", plugin.name)
 			if err := plugin.plugin.Gather(acc); err != nil {