github.com/go4org/go4@v0.0.0-20200104003542-c7e774b10ea0/readerutil/singlereader/opener_test.go (about) 1 /* 2 Copyright 2013 The Go4 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 singlereader 18 19 import ( 20 "bytes" 21 "fmt" 22 "io/ioutil" 23 "os" 24 "runtime" 25 "testing" 26 ) 27 28 func TestOpenSingle(t *testing.T) { 29 if testing.Short() { 30 t.Skip("skipping in short mode") 31 } 32 defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4)) 33 f, err := ioutil.TempFile("", "foo") 34 if err != nil { 35 t.Fatal(err) 36 } 37 defer os.Remove(f.Name()) 38 contents := []byte("Some file contents") 39 if _, err := f.Write(contents); err != nil { 40 t.Fatal(err) 41 } 42 f.Close() 43 44 const j = 4 45 errc := make(chan error, j) 46 for i := 1; i < j; i++ { 47 go func() { 48 buf := make([]byte, len(contents)) 49 for i := 0; i < 400; i++ { 50 rac, err := Open(f.Name()) 51 if err != nil { 52 errc <- err 53 return 54 } 55 n, err := rac.ReadAt(buf, 0) 56 if err != nil { 57 errc <- err 58 return 59 } 60 if n != len(contents) || !bytes.Equal(buf, contents) { 61 errc <- fmt.Errorf("read %d, %q; want %d, %q", n, buf, len(contents), contents) 62 return 63 } 64 if err := rac.Close(); err != nil { 65 errc <- err 66 return 67 } 68 } 69 errc <- nil 70 }() 71 } 72 for i := 1; i < j; i++ { 73 if err := <-errc; err != nil { 74 t.Error(err) 75 } 76 } 77 }