github.com/waldiirawan/apm-agent-go/v2@v2.2.2/utils_test.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package apm
    19  
    20  import (
    21  	"math/rand"
    22  	"os"
    23  	"path/filepath"
    24  	"runtime"
    25  	"testing"
    26  	"time"
    27  
    28  	"github.com/stretchr/testify/assert"
    29  )
    30  
    31  func TestGetCurrentProcess(t *testing.T) {
    32  	process := getCurrentProcess()
    33  	expected := filepath.Base(os.Args[0])
    34  
    35  	// On Linux, the process title can be at most
    36  	// 16 bytes, including the null terminator.
    37  	if runtime.GOOS == "linux" && len(expected) >= 16 {
    38  		expected = expected[:15]
    39  	}
    40  
    41  	assert.Equal(t, expected, process.Title)
    42  }
    43  
    44  func TestGracePeriod(t *testing.T) {
    45  	var p time.Duration = -1
    46  	var seq []time.Duration
    47  	for i := 0; i < 1000; i++ {
    48  		next := nextGracePeriod(p)
    49  		if next == p {
    50  			assert.Equal(t, []time.Duration{
    51  				0,
    52  				time.Second,
    53  				4 * time.Second,
    54  				9 * time.Second,
    55  				16 * time.Second,
    56  				25 * time.Second,
    57  				36 * time.Second,
    58  			}, seq)
    59  			return
    60  		}
    61  		p = next
    62  		seq = append(seq, p)
    63  	}
    64  	t.Fatal("failed to find fixpoint")
    65  }
    66  
    67  func TestJitterDuration(t *testing.T) {
    68  	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
    69  	assert.Equal(t, time.Duration(0), jitterDuration(0, rng, 0.1))
    70  	assert.Equal(t, time.Second, jitterDuration(time.Second, rng, 0))
    71  	for i := 0; i < 100; i++ {
    72  		assert.InDelta(t, time.Second, jitterDuration(time.Second, rng, 0.1), float64(100*time.Millisecond))
    73  	}
    74  }