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it("should send coin correctly", function() {
    var meta;

    //    Get initial balances of first and second account.
    var account_one = accounts[0];
    var account_two = accounts[1];

    var account_one_starting_balance;
    var account_two_starting_balance;
    var account_one_ending_balance;

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it("should successfully call specialFn because enough time passed", async function () {
    let meta = await MetaCoin.new();
    await timeTravel(86400 * 3) //3 days later
    await mineBlock() // workaround for https://github.com/ethereumjs/testrpc/issues/336
    let status = await meta.specialFn.call();
    assert.equal(status, true, "specialFn should be callable after 1 day")
})

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const timeTravel = function (time) {
  return new Promise((resolve, reject) => {
    web3.currentProvider.sendAsync({
      jsonrpc: "2.0",
      method: "evm_increaseTime",
      params: [time], // 86400 is num seconds in day
      id: new Date().getTime()
    }, (err, result) => {
      if(err){ return reject(err) }
      return resolve(result)

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contract MetaCoin {
 //...Code
 uint endTime;
 //...Code
 modifier onlyAfterDate() {
  if(now <= endTime) {
   throw;
  }
  _;
 }

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it("should fail because function does not exist on contract", async function () {
    let meta = await MetaCoin.deployed();
    try {
      await meta.someNonExistentFn.call();
    } catch (e) {
      return true;
    }
    throw new Error("I should never see this!")
  })

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var MetaCoin = artifacts.require("./MetaCoin.sol");
// ... more code
contract('MetaCoin', function(accounts) {

  it("should put 10000 MetaCoin in the first account", async function() {
    let meta = await MetaCoin.deployed();
    let balance = await meta.getBalance.call(accounts[0]);
    assert.equal(balance.valueOf(), 10000, "10000 wasn't in the first account")
  });
   // ... more code

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const operationOne = function async (data) {
  let step1 = await somePromise(data)
  let step2 = await anotherPromise(step1)
  return step2.data
}
actionOne()
  .then(operationOne)
  .then(data => {
    //more work
  })

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const status = () => {
    return MetaCoin.deployed()
          .then(instance => {
             return instance.getBalance.call(accounts[0]);
          })
          .then(balance => {
             assert.equal(balance.valueOf(), 10000, "10000 wasn't in the first account");
          })
}

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//...
const SignVerifyArtifact = require('./contracts/SignAndVerifyExample')
const SignVerify = contract(SignVerifyArtifact)
SignVerify.setProvider(provider)
//...
SignVerify
  .deployed()
  .then(instance => {
    let fixed_msg = `\x19Ethereum Signed Message:\n${msg.length}${msg}`
    let fixed_msg_sha = web3.sha3(fixed_msg)

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signature = signature.substr(2); //remove 0x
const r = '0x' + signature.slice(0, 64)
const s = '0x' + signature.slice(64, 128)
const v = '0x' + signature.slice(128, 130)
const v_decimal = web3.toDecimal(v)