code: func (b *MockConfigBlockBuilder) Build() *common.Block {
  	return &common.Block{
  		Header: &common.BlockHeader{
  			Number: b.Index,
  		},
  		Metadata: b.buildBlockMetadata(),
  		Data: &common.BlockData{
  			Data: b.buildBlockEnvelopeBytes(),
  		},
  	}
  }
docs: // Build creates a mock Chain configuration Block