Add the CI/CD configuration.

.drone.yaml

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+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: test
+    image: clojure:temurin-11-lein-2.10.0-alpine
+    commands:
+      - lein test
+

src/cipher_analytical_machine/symbol_factories.clj

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+(ns cipher-analytical-machine.symbol_factories
+  (:require [clojure.string :as cs])
+  (:gen-class))
+
+(defn lower-english-alphabet-factory
+  "Return the English alphabet with only lowercase letters"
+  []
+  (reduce
+   (fn [acc val] (str acc (char val)))
+   ""
+   (range (int \a) (inc (int \z)))))
+
+(defn english-alphabet-factory
+  "Return the English alphabet with lower and upper case letters"
+  []
+  (let [letters (lower-english-alphabet-factory)]
+    (str letters (cs/upper-case letters))))
+
+(defn lower-ukrainian-alphabet-factory
+  "Return the Ukrainian alphabet with only lowercase letters"
+  []
+  "абвгґдеєжзиіїйклмнопрстуфхцчшщьюя")
+
+(defn ukrainian-alphabet-factory
+  "Return the Ukrainian alphabet with lower and upper case letters"
+  []
+  (let [letters (lower-ukrainian-alphabet-factory)]
+    (str letters (cs/upper-case letters))))
+
+(defn digit-set-factory
+  "Return digits"
+  []
+  "0123456789")
+

test/cipher_analytical_machine/symbol_factories_test.clj

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+(ns cipher-analytical-machine.symbol-factories-test
+  (:require
+   [clojure.test :refer :all]
+   [cipher-analytical-machine.symbol_factories :refer :all]
+  ))
+
+(deftest lower-english-alphabet-factory-test
+  (let [symbols (lower-english-alphabet-factory)]
+    (testing "It must have same order"
+      (is (= "abcdefghijklmnopqrstuvwxyz" symbols)))
+
+    (testing "It must have 26 letters"
+      (is (= 26 (count symbols))))))
+
+(deftest english-alphabet-factory-test
+  (let [symbols (english-alphabet-factory)]
+    (testing "It must have same order"
+      (is (= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" symbols)))
+
+    (testing "It must have 2*26 letters"
+      (is (= (* 2 26) (count symbols))))))
+
+(deftest lower-ukrainian-alphabet-factory-test
+  (let [symbols (lower-ukrainian-alphabet-factory)]
+    (testing "It must have same order"
+      (is (= "абвгґдеєжзиіїйклмнопрстуфхцчшщьюя" symbols)))
+
+    (testing "It must have 33 letters"
+      (is (= 33 (count symbols))))))
+
+(deftest ukrainian-alphabet-factory-test
+  (let [symbols (ukrainian-alphabet-factory)]
+    (testing "It must have same order"
+      (is (= "абвгґдеєжзиіїйклмнопрстуфхцчшщьюяАБВГҐДЕЄЖЗИІЇЙКЛМНОПРСТУФХЦЧШЩЬЮЯ" symbols)))
+
+    (testing "It must have 2*33 letters"
+      (is (= (* 2 33) (count symbols))))))
+
+(deftest digit-set-factory-test
+  (let [symbols (digit-set-factory)]
+    (testing "It must have same order"
+      (is (= "0123456789" symbols)))
+
+    (testing "It must have 10 digits"
+      (is (= 10 (count symbols))))))
+