crud.js

const Crud = artifacts.require('Crud');

contract('Crud', () => {
  let crud;
  beforeEach(async () => {
    crud = await Crud.deployed();
  });

  it('Should create a new user', async () => {
    await crud.create('Frank');
    const user = await crud.read(1);
    assert(user[0].toNumber() === 1);
    assert(user[1] === 'Frank');
  });

  it('Should update an existing user', async () => {
    await crud.update(1, 'Frankk');
    const user = await crud.read(1);
    assert(user[0].toNumber() === 1);
    assert(user[1] === 'Frankk');
  });

  it('Should NOT update a non-existing user', async () => {
    try {
      await crud.update(2, 'Frankk');
    } catch(e) {
      assert(e.message.includes('User does not exist'));
      return;
    }
    assert(false);
  });

  it('Should destroy an existing user', async () => {
    await crud.destroy(1);
    try {
      const user = await crud.read(1);
    } catch(e) {
      assert(e.message.includes('User does not exist'));
      return;
    }
    assert(false);
  });

  it('Should NOT destroy a non-existing user', async () => {
    try {
      await crud.destroy(10);
    } catch(e) {
      assert(e.message.includes('User does not exist'));
      return;
    }
    assert(false);
  });
});