exchain-blockchain_test-1.ex

defmodule ExChain.BlockchainTest do
  @moduledoc """
  This module contains test related to a blockchain
  """

  use ExUnit.Case

  alias ExChain.Blockchain
  alias ExChain.Blockchain.Block

  describe "Blockchain" do
    setup [:initialize_blockchain]

    test "should start with the genesis block", %{blockchain: blockchain} do
      assert %Block{
               data: "genesis data",
               hash: "F277BF9150CD035D55BA5B48CB5BCBE8E564B134E5AD0D56E439DD04A1528D3B",
               last_hash: "-",
               timestamp: 1_599_909_623_805_627
             } == hd(blockchain.chain)
    end

    test "adds a new block", %{blockchain: blockchain} do
      data = "foo"
      blockchain = Blockchain.add_block(blockchain, data)
      [_, block] = blockchain.chain
      assert block.data == data
    end
  end

  defp initialize_blockchain(context), do: Map.put(context, :blockchain, Blockchain.new())
end