blockchain_test.go

package main

import (
	"testing"
)

// Testing adding and mining for new blocks
func TestAddNewBlock(t *testing.T){
    addNewBlock("Genesis block")
    addNewBlock("2nd block")
    addNewBlock("3rd block")
    
    if len(blockChain) != 3 {
        t.Errorf("Only added 3 blocks to block chain got %v blocks", len(blockChain))
    }
}

// Testing the block chain validation algorithm works as expected
func TestIsBlockChainValid(t *testing.T){
    // Block chain has 3 exisiting blocks already from TestAddNewBlock

    if !isBlockChainValid() {
        t.Errorf("Block chain hasn't been tampered with, expected true upon validation but got false")
    }

    blockChain[1].Data = "I've messed with the blockchain"
    if isBlockChainValid() {
        t.Errorf("Block chain data has been tampered with, expected false upon validation but got true")
    }

    blockChain[0].Index = 10000
     if isBlockChainValid() {
        t.Errorf("Block chain order has been tampered with, expected false upon validation but got true")
    }
}