resolver tests

- add resolver tests and fix resolver to pass
- statereg constructor fixed
- comments added to natspec plus docserver integration for natspec userdoc fetching

common/resolver/resolver_test.go

@@ -2,16 +2,74 @@ package resolver
 
 import (
 	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 )
 
-func TestNameToContentHash(t *testing.T) {
+type testBackend struct {
+	// contracts mock
+	contracts map[string](map[string]string)
+}
 
+var (
+	text     = "test"
+	codehash = common.RightPadString("1234", 64)
+	hash     = common.Bytes2Hex(crypto.Sha3([]byte(text)))
+	url      = "bzz://bzzhash/my/path/contr.act"
+)
+
+func NewTestBackend() *testBackend {
+	self := &testBackend{}
+	self.contracts = make(map[string](map[string]string))
+
+	self.contracts[nameRegContractAddress] = make(map[string]string)
+	key := storageAddress(0, common.Hex2Bytes(codehash))
+	self.contracts[nameRegContractAddress][key] = hash
+
+	self.contracts[urlHintContractAddress] = make(map[string]string)
+	key = storageAddress(0, common.Hex2Bytes(hash))
+	self.contracts[urlHintContractAddress][key] = url
+
+	return self
+}
+
+func (self *testBackend) StorageAt(ca, sa string) (res string) {
+	c := self.contracts[ca]
+	if c == nil {
+		return
+	}
+	res = c[sa]
+	return
+}
+
+func TestNameToContentHash(t *testing.T) {
+	b := NewTestBackend()
+	res := New(b, urlHintContractAddress, nameRegContractAddress)
+	got, err := res.NameToContentHash(codehash)
+	if err != nil {
+		t.Errorf("expected no error, got %v", err)
+	} else {
+		if common.Bytes2Hex(got[:]) != hash {
+			t.Errorf("incorrect result, expected %x, got %x: ", hash, common.Bytes2Hex(got[:]))
+		}
+	}
 }
 
 func TestContentHashToUrl(t *testing.T) {
-
+	b := NewTestBackend()
+	res := New(b, urlHintContractAddress, nameRegContractAddress)
+	chash := common.Hash{}
+	copy(chash[:], common.Hex2Bytes(hash))
+	got, err := res.ContentHashToUrl(chash)
+	if err != nil {
+		t.Errorf("expected no error, got %v", err)
+	} else {
+		if string(got[:]) != url {
+			t.Errorf("incorrect result, expected %v, got %s: ", url, string(got[:]))
+		}
+	}
 }
 
 func TestNameToUrl(t *testing.T) {
-
 }