jstat/test/core/jstat-test.js

Statistical Library for JavaScript

var vows = require('vows');
var assert = require('assert');
var suite = vows.describe('jStat');

require('../env.js');

suite.addBatch({
  'jStat': {
    'topic': function() {
      return jStat;
    },

    'basic checks': function(jStat) {
      assert.isFunction(jStat.prototype.toArray);
      assert.isFunction(jStat.prototype.push);
      assert.isFunction(jStat.prototype.sort);
      assert.isFunction(jStat.prototype.splice);

      assert.deepEqual(jStat().toArray(), []);
      assert.deepEqual(jStat(null).toArray(), []);
      assert.deepEqual(jStat(undefined).toArray(), []);
      assert.deepEqual(jStat([]).toArray(), []);

      assert.isTrue(jStat._init.constructor === jStat);
      assert.isTrue(jStat._init.prototype === jStat.prototype);
      assert.isTrue(jStat() instanceof jStat);
      assert.isTrue(jStat(null) instanceof jStat);
      assert.isTrue(jStat(undefined) instanceof jStat);
      assert.isTrue(jStat([]) instanceof jStat);

      assert.equal(jStat.prototype.length, 0);
      assert.equal(jStat([1, 2, 3]).length, 1);
      assert.equal(jStat([1, 2, 3])[0].length, 3);
    },

    'matrix/vector generation': function(jStat) {
      assert.deepEqual(jStat([1, 2, 3]).toArray(), [1, 2, 3]);
      assert.deepEqual(jStat([[1, 2], [3, 4]]).toArray(), [[1, 2], [3, 4]]);
      assert.deepEqual(jStat(jStat([[1, 2], [3, 4]])).toArray(),
                       [[1, 2], [3, 4]]);
      assert.deepEqual(jStat([[1, 2], [3, 4]], function(x) {
        return x * 2;
      }).toArray(), [[2, 4], [6, 8]]);
    },

    'sequence generation': function(jStat) {
      assert.deepEqual(jStat(0, 0.5, 6).toArray(),
                       [0, 0.1, 0.2, 0.3, 0.4, 0.5]);
      assert.deepEqual(jStat(0, 5, 6, function(x) {
        return x * 2;
      }).toArray(), [0, 2, 4, 6, 8, 10]);
    }
  }
});

suite.export(module);