CheckCellTests.LCSTests.TypoClassify C# (CSharp) Method

        public void TypoClassify()
        {
            int NUMTRIALS = 100000;
            double EPSILON = 0.00001;
            var original = "Testing";
            string[] errors = { "Tesying", "eTTsting", "Tessting" };

            // training the model with 5% erroneous strings
            var c = new UserSimulation.Classification();
            var rnd = new Random();
            var p_correct = 0.95;
            int total_char_count = 0;
            int bad_char_count = 0;
            for (int i = 0; i < NUMTRIALS; i++)
            {
                var j = rnd.NextDouble();
                if (j <= p_correct)
                {
                    var outcome = c.ProcessTypos(original, original);
                    Assert.AreEqual(outcome.Item2, 0);
                    bad_char_count += outcome.Item2;
                    total_char_count += original.Length + 1;
                }
                else
                {
                    var entered = errors[rnd.Next(3)];
                    var outcome = c.ProcessTypos(original, entered);
                    Assert.AreNotEqual(outcome.Item2, 0);
                    bad_char_count += outcome.Item2;
                    total_char_count += original.Length + 1;
                }
            }

            // the per-character error rate should be at most the following:
            double shouldbe_p_incorrect = (double)bad_char_count / (double)total_char_count + EPSILON;
            double observed_p_incorrect = c.CharErrorRate();
            Assert.AreEqual(true, observed_p_incorrect <= shouldbe_p_incorrect);
        }