Add more X-chain tests (ava-labs#1487)

Co-authored-by: Stephen Buttolph <stephen@avalabs.org>

Author: coffeeavax

codec/manager.go

@@ -23,14 +23,13 @@ const (
 )
 
 var (
-	ErrUnknownVersion = errors.New("unknown codec version")
-
-	errMarshalNil        = errors.New("can't marshal nil pointer or interface")
-	errUnmarshalNil      = errors.New("can't unmarshal nil")
-	errUnmarshalTooBig   = errors.New("byte array exceeds maximum length")
-	errCantPackVersion   = errors.New("couldn't pack codec version")
-	errCantUnpackVersion = errors.New("couldn't unpack codec version")
-	errDuplicatedVersion = errors.New("duplicated codec version")
+	ErrUnknownVersion    = errors.New("unknown codec version")
+	ErrMarshalNil        = errors.New("can't marshal nil pointer or interface")
+	ErrUnmarshalNil      = errors.New("can't unmarshal nil")
+	ErrUnmarshalTooBig   = errors.New("byte array exceeds maximum length")
+	ErrCantPackVersion   = errors.New("couldn't pack codec version")
+	ErrCantUnpackVersion = errors.New("couldn't unpack codec version")
+	ErrDuplicatedVersion = errors.New("duplicated codec version")
 )
 
 var _ Manager = (*manager)(nil)
@@ -43,7 +42,7 @@ type Manager interface {
 	// Size returns the size, in bytes, of [value] when it's marshaled
 	// using the codec with the given version.
 	// RegisterCodec must have been called with that version.
-	// If [value] is nil, returns [errMarshalNil]
+	// If [value] is nil, returns [ErrMarshalNil]
 	Size(version uint16, value interface{}) (int, error)
 
 	// Marshal the given value using the codec with the given version.
@@ -82,15 +81,15 @@ func (m *manager) RegisterCodec(version uint16, codec Codec) error {
 	defer m.lock.Unlock()
 
 	if _, exists := m.codecs[version]; exists {
-		return errDuplicatedVersion
+		return ErrDuplicatedVersion
 	}
 	m.codecs[version] = codec
 	return nil
 }
 
 func (m *manager) Size(version uint16, value interface{}) (int, error) {
 	if value == nil {
-		return 0, errMarshalNil // can't marshal nil
+		return 0, ErrMarshalNil // can't marshal nil
 	}
 
 	m.lock.RLock()
@@ -110,7 +109,7 @@ func (m *manager) Size(version uint16, value interface{}) (int, error) {
 // To marshal an interface, [value] must be a pointer to the interface.
 func (m *manager) Marshal(version uint16, value interface{}) ([]byte, error) {
 	if value == nil {
-		return nil, errMarshalNil // can't marshal nil
+		return nil, ErrMarshalNil // can't marshal nil
 	}
 
 	m.lock.RLock()
@@ -126,7 +125,7 @@ func (m *manager) Marshal(version uint16, value interface{}) ([]byte, error) {
 	}
 	p.PackShort(version)
 	if p.Errored() {
-		return nil, errCantPackVersion // Should never happen
+		return nil, ErrCantPackVersion // Should never happen
 	}
 	return p.Bytes, c.MarshalInto(value, &p)
 }
@@ -135,19 +134,19 @@ func (m *manager) Marshal(version uint16, value interface{}) ([]byte, error) {
 // interface.
 func (m *manager) Unmarshal(bytes []byte, dest interface{}) (uint16, error) {
 	if dest == nil {
-		return 0, errUnmarshalNil
+		return 0, ErrUnmarshalNil
 	}
 
 	if byteLen := len(bytes); byteLen > m.maxSize {
-		return 0, fmt.Errorf("%w: %d > %d", errUnmarshalTooBig, byteLen, m.maxSize)
+		return 0, fmt.Errorf("%w: %d > %d", ErrUnmarshalTooBig, byteLen, m.maxSize)
 	}
 
 	p := wrappers.Packer{
 		Bytes: bytes,
 	}
 	version := p.UnpackShort()
 	if p.Errored() { // Make sure the codec version is correct
-		return 0, errCantUnpackVersion
+		return 0, ErrCantUnpackVersion
 	}
 
 	m.lock.RLock()

codec/test_codec.go

@@ -746,7 +746,7 @@ func TestTooLargeUnmarshal(codec GeneralCodec, t testing.TB) {
 
 	s := inner{}
 	_, err := manager.Unmarshal(bytes, &s)
-	require.ErrorIs(err, errUnmarshalTooBig)
+	require.ErrorIs(err, ErrUnmarshalTooBig)
 }
 
 type outerInterface interface {

vms/avm/blocks/block_test.go

@@ -25,6 +25,18 @@ var (
 	assetID = ids.GenerateTestID()
 )
 
+func TestInvalidBlock(t *testing.T) {
+	require := require.New(t)
+
+	parser, err := NewParser([]fxs.Fx{
+		&secp256k1fx.Fx{},
+	})
+	require.NoError(err)
+
+	_, err = parser.ParseBlock(nil)
+	require.ErrorIs(err, codec.ErrCantUnpackVersion)
+}
+
 func TestStandardBlocks(t *testing.T) {
 	// check standard block can be built and parsed
 	require := require.New(t)