diff --git a/src/test/scala/org/chepiov/tomodoro/interpreters/InterpreterSpec.scala b/src/test/scala/org/chepiov/tomodoro/interpreters/InterpreterSpec.scala
index b00e684..b9aa891 100644
--- a/src/test/scala/org/chepiov/tomodoro/interpreters/InterpreterSpec.scala
+++ b/src/test/scala/org/chepiov/tomodoro/interpreters/InterpreterSpec.scala
@@ -1,15 +1,17 @@
 package org.chepiov.tomodoro.interpreters
 
+import java.time.OffsetDateTime
 import java.util.concurrent.Executors
 
-import cats.effect.{Clock, IO, Timer}
 import cats.effect.concurrent.Ref
+import cats.effect.{Clock, IO, Timer}
 import cats.syntax.applicative._
 import cats.syntax.functor._
 import cats.syntax.option._
+import org.chepiov.tomodoro.algebras.Repository.ActivityLog
 import org.chepiov.tomodoro.algebras.Telegram.{TCallbackAnswer, TEditMessage, TSendMessage, TUser}
 import org.chepiov.tomodoro.algebras.User.{UserCommand, UserInfoQuery}
-import org.chepiov.tomodoro.algebras.{Statistic, Telegram, User, Users}
+import org.chepiov.tomodoro.algebras._
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.duration.{FiniteDuration, TimeUnit}
@@ -48,10 +50,10 @@ trait InterpreterSpec {
 
   type Activity = (Long, Int, Option[Long])
   case class StatisticState(
-    activity: List[Activity],
-    lastDay: List[Long],
-    lastWeek: List[Long],
-    lastMonth: List[Long]
+      activity: List[Activity],
+      lastDay: List[Long],
+      lastWeek: List[Long],
+      lastMonth: List[Long]
   ) { self =>
     def addActivity(a: Activity): StatisticState   = self.copy(activity = activity :+ a)
     def addLastDay(chatId: Long): StatisticState   = self.copy(lastDay = lastDay :+ chatId)
@@ -68,10 +70,10 @@ trait InterpreterSpec {
   }
 
   case class TelegramState(
-    send: List[TSendMessage],
-    answer: List[TCallbackAnswer],
-    edit: List[TEditMessage],
-    me: Int
+      send: List[TSendMessage],
+      answer: List[TCallbackAnswer],
+      edit: List[TEditMessage],
+      me: Int
   ) { self =>
     def addSend(m: TSendMessage): TelegramState      = self.copy(send = send :+ m)
     def addAnswer(a: TCallbackAnswer): TelegramState = self.copy(answer = answer :+ a)
@@ -85,4 +87,27 @@ trait InterpreterSpec {
     def editMessageText(message: TEditMessage): IO[Unit]       = state.update(_ addEdit message)
     def getMe: IO[TUser]                                       = state.update(_.addMe).as(TUser(1, isBot = true, "tomodoro", none, none))
   }
+
+  case class RepositoryState(logs: List[ActivityLog]) { self =>
+    def addLog(log: ActivityLog): RepositoryState = self.copy(logs = logs :+ log)
+  }
+
+  class RepositoryIO(state: Ref[IO, RepositoryState]) extends Repository[IO] {
+    def findLogs(chatId: Long, offset: Long, limit: Long): IO[List[Repository.ActivityLog]] =
+      state.get.map { s =>
+        s.logs
+          .filter(log => log.chatId == chatId)
+          .sorted(Ordering.by((l: ActivityLog) => l.time).reverse)
+      }
+
+    def addLog(log: Repository.ActivityLog): IO[Unit] =
+      state.update(_ addLog log)
+
+    def countCompleted(chatId: Long, from: OffsetDateTime, to: OffsetDateTime): IO[Long] =
+      state.get.map { s =>
+        s.logs
+          .count(log => log.chatId == chatId && log.time.isAfter(from) && log.time.isBefore(to))
+          .toLong
+      }
+  }
 }
diff --git a/src/test/scala/org/chepiov/tomodoro/interpreters/StatisticInterpreterSpec.scala b/src/test/scala/org/chepiov/tomodoro/interpreters/StatisticInterpreterSpec.scala
new file mode 100644
index 0000000..13e0b9e
--- /dev/null
+++ b/src/test/scala/org/chepiov/tomodoro/interpreters/StatisticInterpreterSpec.scala
@@ -0,0 +1,68 @@
+package org.chepiov.tomodoro.interpreters
+
+import java.time.OffsetDateTime
+
+import cats.effect.IO
+import cats.effect.concurrent.Ref
+import cats.syntax.option._
+import org.chepiov.tomodoro.algebras.Repository.ActivityDescriptor._
+import org.chepiov.tomodoro.algebras.Repository.ActivityLog
+import org.chepiov.tomodoro.algebras.Statistic
+import org.chepiov.tomodoro.programs.UserMessages._
+import org.scalatest.{Matchers, WordSpecLike}
+
+@SuppressWarnings(Array("org.wartremover.warts.NonUnitStatements"))
+class StatisticInterpreterSpec extends WordSpecLike with Matchers with InterpreterSpec {
+
+  private def create(): IO[(Ref[IO, TelegramState], Ref[IO, RepositoryState], Statistic[IO])] =
+    for {
+      telegramState   <- Ref.of[IO, TelegramState](TelegramState(List(), List(), List(), 0))
+      telegram        = new TelegramIO(telegramState)
+      repositoryState <- Ref.of[IO, RepositoryState](RepositoryState(List()))
+      repository      = new RepositoryIO(repositoryState)
+      statistic       <- StatisticInterpreter[IO](telegram, repository)
+    } yield (telegramState, repositoryState, statistic)
+
+  "Statistic" should {
+    "send activities correctly" in {
+      val program = for {
+        (ts, rs, statistic)             <- create()
+        logs                            = ActivityLog(1L, OffsetDateTime.now(), CycleReset, "test") :: Nil
+        _                               <- rs.set(RepositoryState(logs))
+        _                               <- statistic.sendActivity(1L, 0, none)
+        _                               <- statistic.sendActivity(1L, 0, 1L.some)
+        TelegramState(send, _, edit, _) <- ts.get
+      } yield {
+        send shouldBe List(logsMsg(1L, 0, logs))
+        edit shouldBe List(logsEditMsg(1L, 1L, 0, logs))
+      }
+      program.unsafeRunSync()
+    }
+  }
+
+  it should {
+    "send completed count correctly" in {
+      val program = for {
+        (ts, rs, statistic) <- create()
+        now                 = OffsetDateTime.now()
+        logs = List(
+          ActivityLog(1L, now, CycleReset, "today"),
+          ActivityLog(1L, now.minusDays(2), CycleReset, "lastWeek"),
+          ActivityLog(1L, now.minusDays(8), CycleReset, "lastMonth")
+        )
+        _                            <- rs.set(RepositoryState(logs))
+        _                            <- statistic.sendCompletedLastDay(1L)
+        _                            <- statistic.sendCompletedLastWeek(1L)
+        _                            <- statistic.sendCompletedLastMonth(1L)
+        TelegramState(send, _, _, _) <- ts.get
+      } yield {
+        send shouldBe List(
+          completedLastDayMsg(1L, 1),
+          completedLastWeekMsg(1L, 2),
+          completedLastMonthMsg(1L, 3)
+        )
+      }
+      program.unsafeRunSync()
+    }
+  }
+}