(ns cipher-analytical-machine.cipher-analyzers-test
  (:require
   [clojure.test :refer :all]
   [cipher-analytical-machine.cipher-analyzers :refer :all]))

(deftest count-characters-test
  (testing "Count two dublicates and one uniq character from a string."
    (is (= {\a 2 \b 1}
           (count-characters "aba")))))

(deftest chi-squared-letter-statistic-test
  (testing "If the frequence of A is 0.1, the text length is 100 and contains 20 times, then the chi-squared is 10."
    (is (= 10.0
           (chi-squared-letter-statistic 20 0.1 100))))

  (testing "If the frequence of A is 0.1, the text length is 10 and contains 5 times, then the chi-squared is 16.0."
    (is (= 16.0
           (chi-squared-letter-statistic 5 0.1 10)))))

(deftest chi-squared-statistic-test
  (let [text "aaaaabbbbb"]
  (testing "If the frequences of a and b is 0.1, the text length is 10 and contains them 5 times, then score is 32."
    (is (= 32.0
           (chi-squared-statistic text {\a 0.1 \b 0.1}))))))