github.com/shashidharatd/test-infra@v0.0.0-20171006011030-71304e1ca560/mungegithub/mungers/flakesync/cache_test.go (about)

     1  /*
     2  Copyright 2016 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package flakesync
    18  
    19  import (
    20  	"reflect"
    21  	"runtime"
    22  	"sync"
    23  	"testing"
    24  	"time"
    25  
    26  	"github.com/google/gofuzz"
    27  )
    28  
    29  func makeRandom(Job, Number) (*Result, error) {
    30  	r := &Result{}
    31  	fuzz.New().Fuzz(r)
    32  	time.Sleep(time.Millisecond / 4)
    33  	return r, nil
    34  }
    35  
    36  func TestBasic(t *testing.T) {
    37  	c := NewCache(makeRandom)
    38  	r1, err := c.Get("foo", 5)
    39  	if err != nil {
    40  		t.Errorf("unexpected error: %v", err)
    41  	}
    42  	r2, _ := c.Get("foo", 5)
    43  	if !reflect.DeepEqual(r1, r2) {
    44  		t.Errorf("expected to match: %#v, %#v", r1, r2)
    45  	}
    46  	for i := 0; len(c.Flakes()) == 0; i++ {
    47  		c.Get("foo", Number(i))
    48  	}
    49  }
    50  
    51  func TestThreading(t *testing.T) {
    52  	// Test multi-threading even in single threaded environments (like
    53  	// travis).
    54  	runtime.GOMAXPROCS(10)
    55  	c := NewCache(makeRandom)
    56  	c.maxFlakes = 15
    57  	wg := sync.WaitGroup{}
    58  	const threads = 30
    59  	wg.Add(threads)
    60  	for i := 0; i < threads; i++ {
    61  		go func(s int) {
    62  			defer wg.Done()
    63  			for n := 0; n < 30; n++ {
    64  				// n*s means many collide a few times, but some do not
    65  				c.Get("foo", Number(n*s))
    66  			}
    67  			if len(c.Flakes()) > 15 {
    68  				t.Errorf("Max flakes doesn't seem to work, got %v", len(c.Flakes()))
    69  			}
    70  		}(i)
    71  	}
    72  	wg.Wait()
    73  	if len(c.Flakes()) > 15 {
    74  		t.Errorf("Max flakes doesn't seem to work, got %v", len(c.Flakes()))
    75  	}
    76  }