cmd/geth, tests: enable running multiple tests from a single file

This commit also changes the block test loading so tests containing
invalid RLP blocks can be loaded and return an error only when they are
run.

(cherry picked from commit 898ba87984)

tests/blocktest.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -73,8 +74,8 @@ type btBlock struct {
 
 type BlockTest struct {
 	Genesis *types.Block
-	Blocks  []*types.Block
 
+	json        *btJSON
 	preAccounts map[string]btAccount
 }
 
@@ -88,7 +89,7 @@ func LoadBlockTests(file string) (map[string]*BlockTest, error) {
 	for name, in := range bt {
 		var err error
 		if out[name], err = convertTest(in); err != nil {
-			return nil, fmt.Errorf("bad test %q: %v", err)
+			return out, fmt.Errorf("bad test %q: %v", name, err)
 		}
 	}
 	return out, nil
@@ -124,6 +125,15 @@ func (t *BlockTest) InsertPreState(db common.Database) (*state.StateDB, error) {
 	return statedb, nil
 }
 
+// InsertBlocks loads the test's blocks into the given chain.
+func (t *BlockTest) InsertBlocks(chain *core.ChainManager) error {
+	blocks, err := t.convertBlocks()
+	if err != nil {
+		return err
+	}
+	return chain.InsertChain(blocks)
+}
+
 func (t *BlockTest) ValidatePostState(statedb *state.StateDB) error {
 	for addrString, acct := range t.preAccounts {
 		// XXX: is is worth it checking for errors here?
@@ -149,6 +159,21 @@ func (t *BlockTest) ValidatePostState(statedb *state.StateDB) error {
 	return nil
 }
 
+func (t *BlockTest) convertBlocks() (blocks []*types.Block, err error) {
+	// the conversion handles errors by catching panics.
+	// you might consider this ugly, but the alternative (passing errors)
+	// would be much harder to read.
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			buf := make([]byte, 64<<10)
+			buf = buf[:runtime.Stack(buf, false)]
+			err = fmt.Errorf("%v\n%s", recovered, buf)
+		}
+	}()
+	blocks = mustConvertBlocks(t.json.Blocks)
+	return blocks, nil
+}
+
 func convertTest(in *btJSON) (out *BlockTest, err error) {
 	// the conversion handles errors by catching panics.
 	// you might consider this ugly, but the alternative (passing errors)
@@ -160,9 +185,8 @@ func convertTest(in *btJSON) (out *BlockTest, err error) {
 			err = fmt.Errorf("%v\n%s", recovered, buf)
 		}
 	}()
-	out = &BlockTest{preAccounts: in.Pre}
+	out = &BlockTest{preAccounts: in.Pre, json: in}
 	out.Genesis = mustConvertGenesis(in.GenesisBlockHeader)
-	out.Blocks = mustConvertBlocks(in.Blocks)
 	return out, err
 }
 
@@ -203,7 +227,7 @@ func mustConvertBlocks(testBlocks []btBlock) []*types.Block {
 		var b types.Block
 		r := bytes.NewReader(mustConvertBytes(inb.Rlp))
 		if err := rlp.Decode(r, &b); err != nil {
-			panic(fmt.Errorf("invalid block %d: %q", i, inb.Rlp))
+			panic(fmt.Errorf("invalid block %d: %q\nerror: %v", i, inb.Rlp, err))
 		}
 		out = append(out, &b)
 	}
@@ -293,11 +317,18 @@ func findLine(data []byte, offset int64) (line int) {
 }
 
 func unfuckCPPHexInts(s string) string {
-	if s == "0x" { // no respect for the empty value :(
+	switch {
+	case s == "0x":
+		// no respect for the empty value :(
 		return "0x00"
-	}
-	if (len(s) % 2) != 0 { // motherfucking nibbles
+	case len(s) == 0:
+		return "0x00"
+	case len(s) == 1:
+		return "0x0" + s[:1]
+	case len(s)%2 != 0:
+		// motherfucking nibbles
 		return "0x0" + s[2:]
+	default:
+		return s
 	}
-	return s
 }