github.com/muhammadn/cortex@v1.9.1-0.20220510110439-46bb7000d03d/pkg/util/process/collector_test.go (about)

     1  package process
     2  
     3  import (
     4  	"bytes"
     5  	"io/ioutil"
     6  	"os"
     7  	"path/filepath"
     8  	"testing"
     9  
    10  	"github.com/prometheus/client_golang/prometheus"
    11  	"github.com/prometheus/client_golang/prometheus/testutil"
    12  	"github.com/stretchr/testify/assert"
    13  	"github.com/stretchr/testify/require"
    14  )
    15  
    16  func TestProcessCollector(t *testing.T) {
    17  	const pid = 1
    18  
    19  	// Create a mocked proc FS.
    20  	procDir, err := ioutil.TempDir("", "proc")
    21  	require.NoError(t, err)
    22  	defer func() {
    23  		require.NoError(t, os.RemoveAll(procDir))
    24  	}()
    25  
    26  	mapsPath := processMapsPath(procDir, pid)
    27  	mapsLimitPath := vmMapsLimitPath(procDir)
    28  
    29  	require.NoError(t, os.MkdirAll(filepath.Dir(mapsPath), os.ModePerm))
    30  	require.NoError(t, os.MkdirAll(filepath.Dir(mapsLimitPath), os.ModePerm))
    31  
    32  	require.NoError(t, ioutil.WriteFile(mapsPath, []byte("1\n2\n3\n4\n5\n"), os.ModePerm))
    33  	require.NoError(t, ioutil.WriteFile(mapsLimitPath, []byte("262144\n"), os.ModePerm))
    34  
    35  	// Create a new collector and test metrics.
    36  	c, err := newProcessCollector(pid, procDir)
    37  	require.NoError(t, err)
    38  
    39  	reg := prometheus.NewPedanticRegistry()
    40  	require.NoError(t, reg.Register(c))
    41  
    42  	assert.NoError(t, testutil.GatherAndCompare(reg, bytes.NewBufferString(`
    43  		# HELP process_memory_map_areas Number of memory map areas allocated by the process.
    44  		# TYPE process_memory_map_areas gauge
    45  		process_memory_map_areas 5
    46  		# HELP process_memory_map_areas_limit Maximum number of memory map ares the process can allocate.
    47  		# TYPE process_memory_map_areas_limit gauge
    48  		process_memory_map_areas_limit 262144
    49  	`)))
    50  }
    51  
    52  func TestProcessCollector_UnsupportedPlatform(t *testing.T) {
    53  	_, err := newProcessCollector(1, "/path/to/invalid/proc")
    54  	require.Equal(t, ErrUnsupportedCollector, err)
    55  }