openzeppelin-contracts/test/PausableToken.test.js

'user strict';

const assertRevert = require('./helpers/assertRevert');
var PausableTokenMock = artifacts.require('./mocks/PausableTokenMock.sol');

contract('PausableToken', function (accounts) {
  let token;

  beforeEach(async function () {
    token = await PausableTokenMock.new(accounts[0], 100);
  });

  it('should return paused false after construction', async function () {
    let paused = await token.paused();

    assert.equal(paused, false);
  });

  it('should return paused true after pause', async function () {
    await token.pause();
    let paused = await token.paused();

    assert.equal(paused, true);
  });

  it('should return paused false after pause and unpause', async function () {
    await token.pause();
    await token.unpause();
    let paused = await token.paused();

    assert.equal(paused, false);
  });

  it('should be able to transfer if transfers are unpaused', async function () {
    await token.transfer(accounts[1], 100);
    let balance0 = await token.balanceOf(accounts[0]);
    assert.equal(balance0, 0);

    let balance1 = await token.balanceOf(accounts[1]);
    assert.equal(balance1, 100);
  });

  it('should be able to transfer after transfers are paused and unpaused', async function () {
    await token.pause();
    await token.unpause();
    await token.transfer(accounts[1], 100);
    let balance0 = await token.balanceOf(accounts[0]);
    assert.equal(balance0, 0);

    let balance1 = await token.balanceOf(accounts[1]);
    assert.equal(balance1, 100);
  });

  it('should throw an error trying to transfer while transactions are paused', async function () {
    await token.pause();
    try {
      await token.transfer(accounts[1], 100);
      assert.fail('should have thrown before');
    } catch (error) {
      assertRevert(error);
    }
  });

  it('should throw an error trying to transfer from another account while transactions are paused', async function () {
    await token.pause();
    try {
      await token.transferFrom(accounts[0], accounts[1], 100);
      assert.fail('should have thrown before');
    } catch (error) {
      assertRevert(error);
    }
  });
});