mathjs/test/function/set/setIntersect.test.js

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

describe('setIntersect', function () {
  it('should return the intersection of two sets', function () {
    assert.deepEqual(math.setIntersect([1, 2, 3], [3, 4]), [3]);
    assert.deepEqual(math.setIntersect([1, 2], [3, 4]), []);
    assert.deepEqual(math.setIntersect(["a", "b", "c"], ["c", "d"]), ["c"]);
    assert.deepEqual(math.setIntersect([1, math.complex(2,2), math.complex(3,3)],
        [math.complex(3,3), 1]), [math.complex(3,3), 1]);
    assert.deepEqual(math.setIntersect([], [3, 4]), []);
    assert.deepEqual(math.setIntersect([], []), []);
  });

  it('should return the intersection of two multisets', function () {
    assert.deepEqual(math.setIntersect([1, 1, 2, 3, 4, 4], [1, 2, 3, 4, 4, 4]), [1, 2, 3, 4, 4]);
    assert.deepEqual(math.setIntersect([1, 2, 1, 3, 4, 4], [1, 2, 4, 3, 4, 4]), [1, 2, 3, 4, 4]);
  });
  
  it('should return the same type of output as the inputs', function() {
	assert.equal(math.typeof(math.setIntersect([1, 2, 3], [3, 4, 5])), 'Array');
	assert.equal(math.typeof(math.setIntersect(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.setIntersect();}, /TypeError: Too few arguments/);
    assert.throws(function () {math.setIntersect([], [], []);}, /TypeError: Too many arguments/);
  });

});