digest: better test coverage

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2016-12-15 17:21:57 -08:00
parent 6a74c94bf8
commit ecb2ee3824
No known key found for this signature in database
GPG key ID: FB5F6B2905D7ECF3
4 changed files with 116 additions and 11 deletions

View file

@ -72,6 +72,10 @@ func (a *Algorithm) Set(value string) error {
*a = Algorithm(value)
}
if !a.Available() {
return ErrDigestUnsupported
}
return nil
}

100
digest/algorithm_test.go Normal file
View file

@ -0,0 +1,100 @@
package digest
import (
"bytes"
"crypto/rand"
_ "crypto/sha256"
_ "crypto/sha512"
"flag"
"fmt"
"strings"
"testing"
)
func TestFlagInterface(t *testing.T) {
var (
alg Algorithm
flagSet flag.FlagSet
)
flagSet.Var(&alg, "algorithm", "set the digest algorithm")
for _, testcase := range []struct {
Name string
Args []string
Err error
Expected Algorithm
}{
{
Name: "Invalid",
Args: []string{"-algorithm", "bean"},
Err: ErrDigestUnsupported,
},
{
Name: "Default",
Args: []string{"unrelated"},
Expected: "sha256",
},
{
Name: "Other",
Args: []string{"-algorithm", "sha512"},
Expected: "sha512",
},
} {
t.Run(testcase.Name, func(t *testing.T) {
alg = Canonical
if err := flagSet.Parse(testcase.Args); err != testcase.Err {
if testcase.Err == nil {
t.Fatal("unexpected error", err)
}
// check that flag package returns correct error
if !strings.Contains(err.Error(), testcase.Err.Error()) {
t.Fatalf("unexpected error: %v != %v", err, testcase.Err)
}
return
}
if alg != testcase.Expected {
t.Fatalf("unexpected algorithm: %v != %v", alg, testcase.Expected)
}
})
}
}
func TestFroms(t *testing.T) {
p := make([]byte, 1<<20)
rand.Read(p)
for alg := range algorithms {
h := alg.Hash()
h.Write(p)
expected := Digest(fmt.Sprintf("%s:%x", alg, h.Sum(nil)))
readerDgst, err := alg.FromReader(bytes.NewReader(p))
if err != nil {
t.Fatalf("error calculating hash from reader: %v", err)
}
dgsts := []Digest{
alg.FromBytes(p),
alg.FromString(string(p)),
readerDgst,
}
if alg == Canonical {
readerDgst, err := FromReader(bytes.NewReader(p))
if err != nil {
t.Fatalf("error calculating hash from reader: %v", err)
}
dgsts = append(dgsts,
FromBytes(p),
FromString(string(p)),
readerDgst)
}
for _, dgst := range dgsts {
if dgst != expected {
t.Fatalf("unexpected digest %v != %v", dgst, expected)
}
}
}
}

View file

@ -94,17 +94,10 @@ func FromString(s string) Digest {
func (d Digest) Validate() error {
s := string(d)
if !DigestRegexpAnchored.MatchString(s) {
return ErrDigestInvalidFormat
}
i := strings.Index(s, ":")
if i < 0 {
return ErrDigestInvalidFormat
}
// case: "sha256:" with no hex.
if i+1 == len(s) {
// validate i then run through regexp
if i < 0 || i+1 == len(s) || !DigestRegexpAnchored.MatchString(s) {
return ErrDigestInvalidFormat
}

View file

@ -1,8 +1,6 @@
package digest
import (
_ "crypto/sha256"
_ "crypto/sha512"
"testing"
)
@ -28,6 +26,11 @@ func TestParseDigest(t *testing.T) {
input: "sha256:",
err: ErrDigestInvalidFormat,
},
{
// empty hex
input: ":",
err: ErrDigestInvalidFormat,
},
{
// just hex
input: "d41d8cd98f00b204e9800998ecf8427e",
@ -80,5 +83,10 @@ func TestParseDigest(t *testing.T) {
if newParsed != digest {
t.Fatalf("expected equal: %q != %q", newParsed, digest)
}
newFromHex := NewDigestFromHex(newParsed.Algorithm().String(), newParsed.Hex())
if newFromHex != digest {
t.Fatalf("%v != %v", newFromHex, digest)
}
}
}