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