1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
package integrationtests
import (
"bufio"
"crypto/sha256"
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
"testing"
)
// Checks whether both files have the same lines (order doesn't matter)
func compareFilesContents(t *testing.T, fileA, fileB string) error {
mapFile := func(file string) (map[string]int, error) {
t.Log("Reading", file)
contents := make(map[string]int)
fd, err := os.Open(file)
if err != nil {
return contents, err
}
defer fd.Close()
scanner := bufio.NewScanner(fd)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := scanner.Text()
count, _ := contents[line]
contents[line] = count + 1
}
return contents, nil
}
compareMaps := func(a, b map[string]int) error {
for line, countA := range a {
countB, ok := b[line]
if !ok {
return fmt.Errorf("Files differ, line '%s' is missing in one of them", line)
}
if countA != countB {
return fmt.Errorf("Files differ, count of line '%s' is %d in one but %d in another",
line, countA, countB)
}
}
return nil
}
// Read files into maps.
a, err := mapFile(fileA)
if err != nil {
return err
}
b, err := mapFile(fileB)
if err != nil {
return err
}
// The mapreduce result can be in a different order each time (Golang maps are not sorted).
t.Log(fmt.Sprintf("Checking whether %s has same lines as file %s (ignoring line order)",
fileA, fileB))
if err := compareMaps(a, b); err != nil {
return err
}
t.Log(fmt.Sprintf("Checking whether %s has same lines as file %s (ignoring line order)",
fileB, fileA))
if err := compareMaps(b, a); err != nil {
return err
}
return nil
}
func compareFiles(t *testing.T, fileA, fileB string) error {
t.Log("Comparing files", fileA, fileB)
shaFileA := shaOfFile(t, fileA)
shaFileB := shaOfFile(t, fileB)
if shaFileA != shaFileB {
var sb strings.Builder
sb.WriteString(fmt.Sprintf("Expected SHA %s but got %s:\n", shaFileA, shaFileB))
if bytes, err := exec.Command("diff", "-u", fileA, fileB).Output(); err != nil {
sb.Write(bytes)
}
return fmt.Errorf(sb.String())
}
return nil
}
func shaOfFile(t *testing.T, file string) string {
bytes, err := ioutil.ReadFile(file)
if err != nil {
t.Error(err)
}
hasher := sha256.New()
hasher.Write(bytes)
sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
t.Log("SHA", file, sha)
return sha
}
|
