diff --git a/README.md b/README.md
index fc79af300..a93392c8a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Wulkanowy
 
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/b0365aa6584a4c1abf36141204bc8de3)](https://www.codacy.com/app/mklkj/wulkanowy?utm_source=github.com&utm_medium=referral&utm_content=wulkanowy/wulkanowy&utm_campaign=badger)
+[![Codacy Grade Badge](https://api.codacy.com/project/badge/Grade/b0365aa6584a4c1abf36141204bc8de3)](https://www.codacy.com/app/wulkanowy/wulkanowy)
+[![Codacy Coverage Badge](https://api.codacy.com/project/badge/Coverage/b0365aa6584a4c1abf36141204bc8de3)](https://www.codacy.com/app/wulkanowy/wulkanowy)
 [![Build Status](https://www.bitrise.io/app/daeff1893f3c8128.svg?token=Hjm1ACamk86JDeVVJHOeqQ&branch=master)](https://www.bitrise.io/app/daeff1893f3c8128)
 [![CircleCI](https://circleci.com/gh/wulkanowy/wulkanowy.svg?style=svg)](https://circleci.com/gh/wulkanowy/wulkanowy)
 
diff --git a/app/build.gradle b/app/build.gradle
index e0600d51e..6c1390af1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,4 +1,6 @@
 apply plugin: 'com.android.application'
+apply plugin: 'jacoco-android'
+apply plugin: "io.github.ddimtirov.codacy"
 
 android {
     compileSdkVersion 25
@@ -17,6 +19,9 @@ android {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
+        debug {
+            testCoverageEnabled = true
+        }
     }
 }
 
diff --git a/app/src/main/java/io/github/wulkanowy/activity/main/CheckPass.java b/app/src/main/java/io/github/wulkanowy/activity/main/CheckPass.java
index e03cd3665..ace010f80 100644
--- a/app/src/main/java/io/github/wulkanowy/activity/main/CheckPass.java
+++ b/app/src/main/java/io/github/wulkanowy/activity/main/CheckPass.java
@@ -1,30 +1,19 @@
 package io.github.wulkanowy.activity.main;
 
-import org.jsoup.Connection;
 import org.jsoup.nodes.Document;
-import org.jsoup.select.Elements;
+import org.jsoup.nodes.Element;
 
-import java.io.IOException;
+class CheckPass {
 
-public class CheckPass {
+    private Document document;
 
-    Connection.Response page;
-
-    public CheckPass (Connection.Response pageT){
-        page = pageT;
+    CheckPass(Document doc) {
+        document = doc;
     }
 
-    public String start (){
-        try{
-            Document document = page.parse();
-            Elements mesageAlert = document.getElementsByClass("ErrorMessage center");
-            return mesageAlert.text();
-        }
-        catch (IOException e){
-            return e.toString();
-        }
-
+    boolean isLogged() {
+        Element messageAlert = document.select(".ErrorMessage").first();
 
+        return null == messageAlert;
     }
-
 }
diff --git a/app/src/main/java/io/github/wulkanowy/activity/main/Login.java b/app/src/main/java/io/github/wulkanowy/activity/main/Login.java
index 1e33985b5..fe0acd936 100644
--- a/app/src/main/java/io/github/wulkanowy/activity/main/Login.java
+++ b/app/src/main/java/io/github/wulkanowy/activity/main/Login.java
@@ -72,6 +72,7 @@ public class Login extends AsyncTask<Void, Void, Void> {
 
         try {
             if (!stepOne()) {
+                userMesage = activity.getString(R.string.login_bad_credentials);
                 return null;
             }
 
@@ -106,10 +107,9 @@ public class Login extends AsyncTask<Void, Void, Void> {
 
         loginCookies = initial.cookies();
 
-        CheckPass checkPass = new CheckPass(initial);
-        userMesage = checkPass.start();
+        Document document = initial.parse();
 
-        return userMesage.isEmpty();
+        return new CheckPass(document).isLogged();
     }
 
     private Document stepTwo() throws IOException {
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index 5ff807d4c..f32c6b7ed 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -11,6 +11,7 @@
     <string name="data_text">Brak danych logowania</string>
     <string name="error_feature_text">Funkcja którą chciałeś uruchomić nie działa</string>
     <string name="login_accepted">Pomyślnie zalogowano</string>
+    <string name="login_bad_credentials">Zła nazwa użytkownika lub hasło</string>
     <string name="login_denied">Logowanie nie powiodło się</string>
     <string name="please_wait">Proszę czekać…</string>
     <string name="title_activity_dashboard">Aktywność dashboard</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f7a631f38..decc6b078 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -11,6 +11,7 @@
     <string name="data_text">No login data</string>
     <string name="error_feature_text">The function you wanted to run does not work</string>
     <string name="login_accepted">Login is successful</string>
+    <string name="login_bad_credentials">Bad username or password</string>
     <string name="login_denied">Login is failed</string>
     <string name="please_wait">Please wait…</string>
     <string name="title_activity_dashboard">Dashboard Activity</string>
diff --git a/app/src/test/java/io/github/wulkanowy/ExampleUnitTest.java b/app/src/test/java/io/github/wulkanowy/ExampleUnitTest.java
deleted file mode 100644
index 4868407c8..000000000
--- a/app/src/test/java/io/github/wulkanowy/ExampleUnitTest.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package io.github.wulkanowy;
-
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() throws Exception {
-        assertEquals(4, 2 + 2);
-    }
-}
\ No newline at end of file
diff --git a/app/src/test/java/io/github/wulkanowy/activity/main/CheckPassTest.java b/app/src/test/java/io/github/wulkanowy/activity/main/CheckPassTest.java
new file mode 100644
index 000000000..089b8e414
--- /dev/null
+++ b/app/src/test/java/io/github/wulkanowy/activity/main/CheckPassTest.java
@@ -0,0 +1,28 @@
+package io.github.wulkanowy.activity.main;
+
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class CheckPassTest {
+
+    @Test
+    public void testFailureLogin() throws Exception {
+        String html = "<div class='ErrorMessage center'>Zła nazwa użytkownika lub hasło</div>";
+        Document doc = Jsoup.parse(html);
+        CheckPass obj = new CheckPass(doc);
+
+        assertFalse(obj.isLogged());
+    }
+
+    @Test
+    public void testSuccessfulLogin() throws Exception {
+        String html = "<title>Working...</title>";
+        Document doc = Jsoup.parse(html);
+        CheckPass check = new CheckPass(doc);
+
+        assertTrue(check.isLogged());
+    }
+}
diff --git a/build.gradle b/build.gradle
index c2eea8e27..23fa39aec 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,12 +3,17 @@
 buildscript {
     repositories {
         jcenter()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
+        classpath 'com.dicedmelon.gradle:jacoco-android:0.1.1'
+        classpath "gradle.plugin.io.github.ddimtirov:codacy-gradle-plugin:0.1.0"
     }
 }
 
diff --git a/circle.yml b/circle.yml
index 91c2a8eb7..0e7836294 100644
--- a/circle.yml
+++ b/circle.yml
@@ -7,18 +7,29 @@ machine:
 
 dependencies:
   pre:
-    - wget "https://downloads.gradle.org/distributions/gradle-2.3-bin.zip"; unzip gradle-2.3-bin.zip
+    - wget "https://downloads.gradle.org/distributions/gradle-3.3-bin.zip"; unzip gradle-3.3-bin.zip
   override:
-    - echo y | android update sdk --no-ui --all --filter tools,platform-tools,build-tools-25.0.2,android-25,extra-google-m2repository,extra-google-google_play_services,extra-android-m2repository
+    - echo y | android update sdk --no-ui --all --filter tools,platform-tools,build-tools-25.0.3,android-25,extra-google-m2repository,extra-google-google_play_services,extra-android-m2repository
     # Constraint Layout / [Solver for ConstraintLayout 1.0.0-alpha8, ConstraintLayout for Android 1.0.0-alpha8]
     - mkdir -p $ANDROID_HOME/licenses/
     - echo "8933bad161af4178b1185d1a37fbf41ea5269c55" > $ANDROID_HOME/licenses/android-sdk-license
     - echo "84831b9409646a918e30573bab4c9c91346d8abd" > $ANDROID_HOME/licenses/android-sdk-preview-licens
     - ANDROID_HOME=/usr/local/android-sdk-linux ./gradlew dependencies
 
+compile:
+  pre:
+    - ./gradlew --version
+  override:
+    - ./gradlew assembleDebug
+  post:
+    - mv app/build/outputs/apk/app-debug.apk $CIRCLE_ARTIFACTS
+
 test:
   override:
     - ./gradlew test
     - ./gradlew check
-    - ./gradlew assembleDebug
-    - cp app/build/outputs/apk/app-debug.apk $CIRCLE_ARTIFACTS
+    - ./gradlew codacyUpload
+  post:
+    - mv app/build/reports/tests/ $CIRCLE_ARTIFACTS/tests
+    - mv app/build/reports/lint-results.html $CIRCLE_ARTIFACTS
+    - mv app/build/reports/jacoco/jacocoTestDebugUnitTestReport/ $CIRCLE_ARTIFACTS/coverage