mathjs/test/function/set/setCartesian.test.js

// test setCartesian
var assert = require('assert');
var math = require('../../../index');

describe('setCartesian', function () {
  it('should return the cartesian product of two sets', function () {
    assert.deepEqual(math.setCartesian([1], [3]), [[1, 3]]);
    assert.deepEqual(math.setCartesian([1, 2], [3]), [[1, 3], [2, 3]]);
    assert.deepEqual(math.setCartesian([1, 2], [3, 4]), [[1, 3], [1, 4], [2, 3], [2, 4]]);
    assert.deepEqual(math.setCartesian([], [3, 4]), []);
    assert.deepEqual(math.setCartesian([], []), []);
  });

  it('should return the cartesian product of two sets with mixed content', function () {
    assert.deepEqual(math.setCartesian([1, math.complex(2, 3)], [3]), [[math.complex(2, 3), 3], [1, 3]]);
  });

  it('should return the cartesian product of two multisets', function () {
    assert.deepEqual(math.setCartesian([1, 1], [3, 3]), [[1,3], [1, 3], [1, 3], [1, 3]]);
  });
  
  it('should return the same type of output as the inputs', function() {
	assert.equal(math.typeof(math.setCartesian([1, 2, 3], [3, 4, 5])), 'Array');
	assert.equal(math.typeof(math.setCartesian(math.matrix([1, 2, 3]), math.matrix([3, 4, 5]))), 'Matrix');
  });

  it('should throw an error in case of invalid number of arguments', function() {
    assert.throws(function () {math.setCartesian();}, /TypeError: Too few arguments/);
    assert.throws(function () {math.setCartesian([], [], []);}, /TypeError: Too many arguments/);
  });

});