// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package collector

import (
	"os"
	"testing"
)

func TestDiskStats(t *testing.T) {
	file, err := os.Open("fixtures/proc/diskstats")
	if err != nil {
		t.Fatal(err)
	}
	defer file.Close()

	diskStats, err := parseDiskStats(file)
	if err != nil {
		t.Fatal(err)
	}

	if want, got := "25353629", diskStats["sda4"][0]; want != got {
		t.Errorf("want diskstats sda4 %s, got %s", want, got)
	}

	if want, got := "68", diskStats["mmcblk0p2"][10]; want != got {
		t.Errorf("want diskstats mmcblk0p2 %s, got %s", want, got)
	}

	if want, got := "513713216512", diskStats["sda"][11]; want != got {
		t.Errorf("want diskstats sda read bytes %s, got %s", want, got)
	}

	if want, got := "258916880384", diskStats["sda"][12]; want != got {
		t.Errorf("want diskstats sda write bytes %s, got %s", want, got)
	}
}
