telegraf/plugins/inputs/exec/exec_test.go

package exec

import (
	"fmt"
	"testing"

	"github.com/influxdb/telegraf/testutil"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// Midnight 9/22/2015
const baseTimeSeconds = 1442905200

const validJson = `
{
    "status": "green",
    "num_processes": 82,
    "cpu": {
        "status": "red",
        "nil_status": null,
        "used": 8234,
        "free": 32
    },
    "percent": 0.81,
    "users": [0, 1, 2, 3]
}`

const malformedJson = `
{
    "status": "green",
`

type runnerMock struct {
	out []byte
	err error
}

func newRunnerMock(out []byte, err error) Runner {
	return &runnerMock{
		out: out,
		err: err,
	}
}

func (r runnerMock) Run(e *Exec) ([]byte, error) {
	if r.err != nil {
		return nil, r.err
	}
	return r.out, nil
}

func TestExec(t *testing.T) {
	e := &Exec{
		runner:  newRunnerMock([]byte(validJson), nil),
		Command: "testcommand arg1",
	}

	var acc testutil.Accumulator
	err := e.Gather(&acc)
	require.NoError(t, err)
	assert.Equal(t, acc.NFields(), 8, "non-numeric measurements should be ignored")

	fields := map[string]interface{}{
		"num_processes": float64(82),
		"cpu_used":      float64(8234),
		"cpu_free":      float64(32),
		"percent":       float64(0.81),
		"users_0":       float64(0),
		"users_1":       float64(1),
		"users_2":       float64(2),
		"users_3":       float64(3),
	}
	acc.AssertContainsFields(t, "exec", fields)
}

func TestExecMalformed(t *testing.T) {
	e := &Exec{
		runner:  newRunnerMock([]byte(malformedJson), nil),
		Command: "badcommand arg1",
	}

	var acc testutil.Accumulator
	err := e.Gather(&acc)
	require.Error(t, err)
	assert.Equal(t, acc.NFields(), 0, "No new points should have been added")
}

func TestCommandError(t *testing.T) {
	e := &Exec{
		runner:  newRunnerMock(nil, fmt.Errorf("exit status code 1")),
		Command: "badcommand",
	}

	var acc testutil.Accumulator
	err := e.Gather(&acc)
	require.Error(t, err)
	assert.Equal(t, acc.NFields(), 0, "No new points should have been added")
}