fix tests

closes #939

CHANGELOG.md

@@ -5,6 +5,7 @@
 - [#979](https://github.com/influxdata/telegraf/pull/979): Reduce allocations in the TCP listener.
 - [#935](https://github.com/influxdata/telegraf/pull/935): AWS Cloudwatch input plugin. Thanks @joshhardy & @ljosa!
 - [#943](https://github.com/influxdata/telegraf/pull/943): http_response input plugin. Thanks @Lswith!
+- [#939](https://github.com/influxdata/telegraf/pull/939): sysstat input plugin. Thanks @zbindenren!
 
 ### Bugfixes
 - [#968](https://github.com/influxdata/telegraf/issues/968): Processes plugin gets unknown state when spaces are in (command name)

README.md

@@ -206,6 +206,7 @@ Currently implemented sources:
 * [zfs](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/zfs)
 * [zookeeper](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/zookeeper)
 * [win_perf_counters ](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/win_perf_counters) (windows performance counters)
+* [sysstat](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/sysstat)
 * [system](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/system)
     * cpu
     * mem

plugins/inputs/sysstat/sysstat.go

@@ -72,8 +72,10 @@ func (*Sysstat) Description() string {
 var sampleConfig = `
   ## Path to the sadc command.
   #
-  ## On Debian and Arch Linux the default path is /usr/lib/sa/sadc whereas
-  ## on RHEL and CentOS the default path is /usr/lib64/sa/sadc
+  ## Common Defaults:
+  ##   Debian/Ubuntu: /usr/lib/sysstat/sadc
+  ##   Arch:          /usr/lib/sa/sadc
+  ##   RHEL/CentOS:   /usr/lib64/sa/sadc
   sadc_path = "/usr/lib/sa/sadc" # required
   #
   #

plugins/inputs/sysstat/sysstat_test.go

@@ -15,6 +15,7 @@ import (
 var s = Sysstat{
 	interval:   10,
 	Sadc:       "/usr/lib/sa/sadc",
+	Sadf:       "/usr/bin/sadf",
 	Group:      false,
 	Activities: []string{"DISK", "SNMP"},
 	Options: map[string]string{