tests.js

var assert = require("assert");
var classNames = require('./');

describe('classNames', function() {
  it('keeps object keys with truthy values', function() {
    assert.equal(classNames({
      a: true,
      b: false,
      c: 0,
      d: null,
      e: undefined,
      f: 1,
    }), 'a f');
  });

  it('joins arrays of class names and ignore falsy values', function() {
    assert.equal(classNames('a', 0, null, undefined, true, 1, 'b'), 'a 1 b');
  });

  it('supports heterogenous arguments', function() {
    assert.equal(classNames({a: true}, 'b', 0), 'a b');
  });

  it('should be trimmed', function() {
    assert.equal(classNames('', 'b', {}, ''), 'b');
  });

  it('returns an empty string for an empty configuration', function() {
    assert.equal(classNames({}), '');
  });

  it('supports an array of class names', function() {
    assert.equal(classNames(['a', 'b']), 'a b');
  });

  it('joins array arguments with string arguments', function() {
    assert.equal(classNames(['a', 'b'], 'c'), 'a b c');
    assert.equal(classNames('c', ['a', 'b']), 'c a b');
  });

  it('handles multiple array arguments', function() {
    assert.equal(classNames(['a', 'b'], ['c', 'd']), 'a b c d');
  });

  it('handles arrays that include falsy and true values', function() {
    assert.equal(classNames(['a', 0, null, undefined, false, true, 'b']), 'a b');
  });

  it('handles arrays that include arrays', function() {
    assert.equal(classNames(['a', ['b', 'c']]), 'a b c');
  });

  it('handles arrays that include objects', function() {
    assert.equal(classNames(['a', {b: true, c: false}]), 'a b');
  });

  it('handles deep array recursion', function() {
    assert.equal(classNames(['a', ['b', ['c', {d: true}]]]), 'a b c d');
  });
});