mathjs/test/error/IndexError.test.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

var assert = require('assert'),
    IndexError = require('../../lib/error/IndexError');

describe('IndexError', function () {

  it('should construct an IndexError without min and max', function () {
    var err = new IndexError(5);
    assert(err instanceof Error);
    assert(err instanceof RangeError);
    assert(err instanceof IndexError);
    assert.equal(err.index, 5);
    assert.equal(err.min, 0);
    assert.equal(err.max, undefined);
    assert.equal(err.toString(), 'IndexError: Index out of range (5)');
  });

  it('should construct an IndexError without min and max (2)', function () {
    var err = new IndexError(-5);
    assert(err instanceof Error);
    assert(err instanceof RangeError);
    assert(err instanceof IndexError);
    assert.equal(err.index, -5);
    assert.equal(err.min, 0);
    assert.equal(err.max, undefined);
    assert.equal(err.toString(), 'IndexError: Index out of range (-5 < 0)');
  });

  it('should construct an IndexError with max', function () {
    var err = new IndexError(5, 3);
    assert(err instanceof Error);
    assert(err instanceof RangeError);
    assert(err instanceof IndexError);
    assert.equal(err.index, 5);
    assert.equal(err.min, 0);
    assert.equal(err.max, 3);
    assert.equal(err.toString(), 'IndexError: Index out of range (5 > 2)');
  });

  it('should construct an IndexError with min and max', function () {
    var err = new IndexError(0, 2, 5);
    assert(err instanceof Error);
    assert(err instanceof RangeError);
    assert(err instanceof IndexError);
    assert.equal(err.index, 0);
    assert.equal(err.min, 2);
    assert.equal(err.max, 5);
    assert.equal(err.toString(), 'IndexError: Index out of range (0 < 2)');
  });

  it('should construct an IndexError with min and max', function () {
    var err = new IndexError(6, 1, 4);
    assert(err instanceof Error);
    assert(err instanceof RangeError);
    assert(err instanceof IndexError);
    assert.equal(err.index, 6);
    assert.equal(err.min, 1);
    assert.equal(err.max, 4);
    assert.equal(err.toString(), 'IndexError: Index out of range (6 > 3)');
  });

  it('should throw an error when constructed without new operator', function() {
    assert.throws(function () {
      IndexError(5);
    });
  });
});