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

describe('det', function() {

  it('should calculate correctly the determinant of a number', function() {
    assert.equal(math.det(3), 3);
  });

  it('should calculate correctly the determinant of a 2x2 matrix', function() {
    assert.equal(math.det([5]), 5);
    assert.equal(math.det([[1,2],[3,4]]), -2);
    assert.equal(math.det(math.matrix([[1,2],[3,4]])), -2);
    assert.equal(math.det([
      [-2, 2,  3],
      [-1, 1,  3],
      [ 2, 0, -1]
    ]), 6);
    assert.equal(math.det([
      [ 1, 4,  7],
      [ 3, 0,  5],
      [-1, 9, 11]
    ]), -8);
    assert.equal(math.det(math.diag([4,-5,6])), -120);
  });

});