internal/checksum: add some tests

internal/checksum/checksum_test.go

@@ -3,3 +3,48 @@
 // license that can be found in the LICENSE file.
 
 package checksum
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/base64"
+	"testing"
+)
+
+func TestEncodedCrc32cChecksum(t *testing.T) {
+	var data [32]byte
+	_, err := rand.Read(data[:])
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	encoded := EncodedCrc32cChecksum(data[:])
+	decoded, err := base64.StdEncoding.DecodeString(encoded)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := crc32cChecksum(data[:])
+	if !bytes.Equal(decoded, expected) {
+		t.Errorf("incorrect value after decoding\nwant %x, got  %x", expected, decoded)
+	}
+}
+
+func TestEncodedMd5Hash(t *testing.T) {
+	var data [32]byte
+	_, err := rand.Read(data[:])
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	encoded := EncodedMd5Hash(data[:])
+	decoded, err := base64.StdEncoding.DecodeString(encoded)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := MD5Hash(data[:])
+	if !bytes.Equal(decoded, expected) {
+		t.Errorf("incorrect value after decoding\nwant %x, got  %x", expected, decoded)
+	}
+}