110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
// +build linux
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package chrony
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import (
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"fmt"
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"os"
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"os/exec"
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"testing"
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"github.com/influxdata/telegraf/testutil"
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)
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func TestGather(t *testing.T) {
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c := Chrony{
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path: "chronyc",
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}
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// overwriting exec commands with mock commands
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execCommand = fakeExecCommand
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defer func() { execCommand = exec.Command }()
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var acc testutil.Accumulator
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err := c.Gather(&acc)
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if err != nil {
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t.Fatal(err)
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}
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tags := map[string]string{
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"reference_id": "192.168.1.22",
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"leap_status": "not synchronized",
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"stratum": "3",
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}
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fields := map[string]interface{}{
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"last_offset": 0.000012651,
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"rms_offset": 0.000025577,
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"frequency": -16.001,
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"residual_freq": 0.0,
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"skew": 0.006,
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"root_delay": 0.001655,
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"root_dispersion": 0.003307,
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"update_interval": 507.2,
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}
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acc.AssertContainsTaggedFields(t, "chrony", fields, tags)
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// test with dns lookup
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c.DNSLookup = true
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err = c.Gather(&acc)
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if err != nil {
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t.Fatal(err)
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}
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acc.AssertContainsTaggedFields(t, "chrony", fields, tags)
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}
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// fackeExecCommand is a helper function that mock
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// the exec.Command call (and call the test binary)
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func fakeExecCommand(command string, args ...string) *exec.Cmd {
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cs := []string{"-test.run=TestHelperProcess", "--", command}
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cs = append(cs, args...)
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cmd := exec.Command(os.Args[0], cs...)
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cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1"}
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return cmd
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}
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// TestHelperProcess isn't a real test. It's used to mock exec.Command
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// For example, if you run:
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// GO_WANT_HELPER_PROCESS=1 go test -test.run=TestHelperProcess -- chrony tracking
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// it returns below mockData.
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func TestHelperProcess(t *testing.T) {
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if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
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return
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}
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lookup := "Reference ID : 192.168.1.22 (ntp.example.com)\n"
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noLookup := "Reference ID : 192.168.1.22 (192.168.1.22)\n"
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mockData := `Stratum : 3
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Ref time (UTC) : Thu May 12 14:27:07 2016
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System time : 0.000020390 seconds fast of NTP time
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Last offset : +0.000012651 seconds
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RMS offset : 0.000025577 seconds
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Frequency : 16.001 ppm slow
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Residual freq : -0.000 ppm
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Skew : 0.006 ppm
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Root delay : 0.001655 seconds
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Root dispersion : 0.003307 seconds
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Update interval : 507.2 seconds
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Leap status : Not synchronized
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`
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args := os.Args
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// Previous arguments are tests stuff, that looks like :
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// /tmp/go-build970079519/…/_test/integration.test -test.run=TestHelperProcess --
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cmd, args := args[3], args[4:]
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if cmd == "chronyc" {
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if args[0] == "tracking" {
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fmt.Fprint(os.Stdout, lookup+mockData)
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} else {
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fmt.Fprint(os.Stdout, noLookup+mockData)
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}
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} else {
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fmt.Fprint(os.Stdout, "command not found")
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os.Exit(1)
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}
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os.Exit(0)
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}
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