diff --git a/package.json b/package.json
index 665cfb1..e6a90e9 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "Telegram bot to manage spam and rules for @_ru community",
   "main": "src/index.js",
   "scripts": {
-    "test": "npm run test:lint",
+    "test": "npm run test:lint && npm run test:code",
+    "test:code": "ava",
     "test:lint": "eslint .",
     "dev": "cross-env DEBUG=rubot:* nodemon -e yaml,js,json -w locales -w src ./src",
     "start": "pm2 startOrRestart ./process.config.js",
@@ -31,13 +32,16 @@
   },
   "homepage": "https://github.com/LestaD/ru_bot#readme",
   "devDependencies": {
+    "ava": "^0.24.0",
     "cross-env": "^5.1.1",
     "eslint": "^4.12.0",
     "eslint-config-atomix-base": "^5.0.0",
     "husky": "^0.14.3",
     "nodemon": "^1.12.1",
+    "nyc": "^11.3.0",
     "pm2": "^2.8.0",
-    "sequelize-cli": "^3.1.0"
+    "sequelize-cli": "^3.1.0",
+    "sinon": "^4.1.2"
   },
   "dependencies": {
     "botanio": "0.0.6",
@@ -47,5 +51,10 @@
     "pg-hstore": "^2.3.2",
     "sequelize": "^4.23.2",
     "telegraf": "^3.16.4"
+  },
+  "ava": {
+    "files": [
+      "src/**/*.test.js"
+    ]
   }
 }
diff --git a/src/lib/text.js b/src/lib/text.js
index e4f679a..70ce49a 100644
--- a/src/lib/text.js
+++ b/src/lib/text.js
@@ -37,9 +37,7 @@ function fullName({ first_name: first, last_name: last, username }) {
  * @param {Chat} param0
  * @return {string}
  */
-function chatTitle({
-  title, username, id, type,
-}) {
+function chatTitle({ title, username, id, type }) {
   const parts = [
     title,
     username && `(@${username})`,
diff --git a/src/lib/text.test.js b/src/lib/text.test.js
new file mode 100644
index 0000000..7a3cdfd
--- /dev/null
+++ b/src/lib/text.test.js
@@ -0,0 +1,55 @@
+import test from 'ava'
+import sinon from 'sinon'
+import text from './text'
+
+/* eslint-disable no-magic-numbers */
+
+
+test('random(variants) should return from variant', (t) => {
+  const variants = [() => 1, () => 2]
+  const result = text.random(variants)()
+
+  t.true(result === 1 || result === 2)
+})
+
+test('random(variants)() should pass arguments', (t) => {
+  const variants = [sinon.spy(), sinon.spy()]
+
+  text.random(variants)(1)
+  t.true(variants[0].calledWith(1) || variants[1].calledWith(1))
+})
+
+
+test('fullName(user) should get correct result', (t) => {
+  t.is(text.fullName({ first_name: 'Foo' }), 'Foo')
+  t.is(text.fullName({ last_name: 'Bar' }), 'Bar')
+  t.is(text.fullName({ username: 'foobar' }), '(@foobar)')
+
+  t.is(text.fullName({ first_name: 'Foo', last_name: 'Bar' }), 'Foo Bar')
+  t.is(text.fullName({ first_name: 'Foo', username: 'foobar' }), 'Foo (@foobar)')
+  t.is(text.fullName({ last_name: 'Bar', username: 'foobar' }), 'Bar (@foobar)')
+  t.is(text.fullName({ first_name: 'Foo', last_name: 'Bar', username: 'foobar' }), 'Foo Bar (@foobar)')
+})
+
+test('chatTitle(chat) should return correct name', (t) => {
+  t.is(text.chatTitle({ type: 'private', id: 1 }), 'private:1')
+  t.is(text.chatTitle({ type: 'private', id: 1, title: 'Chat' }), 'Chat')
+  t.is(text.chatTitle({ type: 'private', id: 1, username: 'chat' }), '(@chat)')
+  t.is(text.chatTitle({ type: 'private', id: 1, title: 'Chat', username: 'chat' }), 'Chat (@chat)')
+})
+
+test('select(value, cases, defaultCase) should select from map', (t) => {
+  const cases = { foo: 1, bar: 2, baz: 3, 555: 4 }
+
+  t.is(text.select('foo', cases, 5), 1)
+  t.is(text.select('bar', cases, 5), 2)
+  t.is(text.select('baz', cases, 5), 3)
+  t.is(text.select(555, cases, 5), 4)
+  t.is(text.select('NOT', cases, 5), 5)
+})
+
+test('column(1,2) should join with \n', (t) => {
+  t.is(text.column('a', 'b', 'c'), 'a\nb\nc')
+  t.is(text.column('a', 'b'), 'a\nb')
+  t.is(text.column('a'), 'a')
+})