`
Write a lookup() function that takes login and a property as
arguments and returns the property value.

The function should check if login is an actual user and the given
property is a property of that contact.

If both are true, then return the "value" of that property.

If login is not found, return an error with the message,
"Could not find user." 

If prop is not found, return an error with the message,
"Could not find property."
`

// Data
const users = [
  {
    "login": "knuth",
    "firstName": "Donald",
    "lastName": "Knuth",
    "likes": ["C", "Unix"]
  },
  {
    "login": "norvig",
    "firstName": "Peter",
    "lastName": "Norvig",
    "likes": ["AI", "Search", "NASA", "Mars"]
  },
  {
    "login": "mfowler",
    "firstName": "Martin",
    "lastName": "Fowler",
    "likes": ["Design Patterns", "Refactoring"]
  },
  {
    "login": "kent",
    "firstName": "Kent",
    "lastName": "Beck",
    "likes": ["TDD", "wikis", "Design Patterns"]
  }
];


// lookup()
const lookup = (login, prop) => {
// Only change code below this line

// Only change code above this line
};



// Tests
test('lookup() likes', assert => {
  const msg = `lookup(<login>, 'likes') should return likes
    for the specified user.`;

  const actual = lookup('norvig', 'likes');
  const expected = ["AI", "Search", "NASA", "Mars"];

  assert.deepEqual(actual, expected, msg);
  assert.end();
});


test('lookup() last name', assert => {
  const msg = `lookup(<login>, 'lastName') should return the last name
     for the specified user.`;

  const actual = lookup('knuth', 'lastName');
  const expected = 'Knuth';

  assert.deepEqual(actual, expected, msg);
  assert.end();
});


test('lookup() with unknown user', assert => {
  const msg = `lookup() with unknown user should return an error
    with the correct message.`;

  const value = lookup('nobody', 'likes');

  const actual = value.message;
  const expected = 'Could not find user.';

  assert.equal(actual, expected, msg);
  assert.end();
});


test('lookup() with unknown property', assert => {
  const msg = `lookup() with unknown property should return an error
    with the correct message`;

  const value = lookup('mfowler', 'noprop');

  const actual = value.message;
  const expected = 'Could not find property.';

  assert.equal(actual, expected, msg);
  assert.end();
});