// Copyright 2018 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 procfs

import "testing"

func TestNewFS(t *testing.T) {
	if _, err := NewFS("foobar"); err == nil {
		t.Error("want NewFS to fail for non-existing mount point")
	}

	if _, err := NewFS("procfs.go"); err == nil {
		t.Error("want NewFS to fail if mount point is not a directory")
	}
}

func TestFSXFSStats(t *testing.T) {
	stats, err := FS("fixtures").XFSStats()
	if err != nil {
		t.Fatalf("failed to parse XFS stats: %v", err)
	}

	// Very lightweight test just to sanity check the path used
	// to open XFS stats. Heavier tests in package xfs.
	if want, got := uint32(92447), stats.ExtentAllocation.ExtentsAllocated; want != got {
		t.Errorf("unexpected extents allocated:\nwant: %d\nhave: %d", want, got)
	}
}