Fix failing utils unit test

This commit fixes a test:
- fixes function names (no UUID but TxID)
- a SHA256 hash is 256 long, not 36 like the old
  UUID was
- fixes datatype in function that generates ID
  using custom algorithm

Change-Id: I63e096c41034278be5aa8651de3b4352ee7b378c
Signed-off-by: Gabor Hosszu <gabor@digitalasset.com>

core/util/utils_test.go

@@ -69,19 +69,16 @@ func TestGenerateHashFromSignature(t *testing.T) {
 	}
 }
 
-func TestGenerateUUIDfromTxSHAHash(t *testing.T) {
-	uuid := GenerateUUIDfromTxSHAHash([]byte("foobar"))
-	if len(uuid) != 36 {
-		t.Fatalf("UUID length is not correct. Expected = 36, Got = %d", len(uuid))
-	}
-	uuid2 := GenerateUUIDfromTxSHAHash([]byte("foobar1"))
-	if uuid == uuid2 {
-		t.Fatalf("Two UUIDs are equal. This should never occur")
+func TestGeneratIDfromTxSHAHash(t *testing.T) {
+	txid := GenerateIDfromTxSHAHash([]byte("foobar"))
+	txid2 := GenerateIDfromTxSHAHash([]byte("foobar1"))
+	if txid == txid2 {
+		t.Fatalf("Two TxIDs are equal. This should never occur")
 	}
 }
 
 func TestGenerateIDWithAlg(t *testing.T) {
-	_, err := GenerateIDWithAlg("sha256base64", "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA")
+	_, err := GenerateIDWithAlg("sha256", []byte{1, 1, 1, 1})
 	if err != nil {
 		t.Fatalf("Decoder failure: %v", err)
 	}