Added TimeIsOverFragment

app/src/androidTest/java/com/example/quickmax/MainActivityTest.kt

@@ -13,6 +13,7 @@ import androidx.test.espresso.ViewAction
 import androidx.test.espresso.UiController
 import androidx.test.espresso.action.ViewActions.click
 import androidx.test.espresso.matcher.ViewMatchers.*
+import junit.framework.Assert.assertNotNull
 import junit.framework.Assert.assertTrue
 import org.hamcrest.Matcher
 import org.junit.Before
@@ -57,8 +58,18 @@ class MainActivityTest {
     }
 
     @Test
-    fun timer() {
-        // TODO write test
+    fun time_decreases() {
+        val time1 = getText(withId(R.id.tv_time_left)).toInt()
+        Thread.sleep(1000)
+        val time2 = getText(withId(R.id.tv_time_left)).toInt()
+        assertTrue(time2 < time1)
+    }
+
+    @Test
+    fun fragment_when_time_is_over() {
+        Thread.sleep(3000)
+        assertNotNull(testRule.activity.supportFragmentManager.fragments.find {
+                f -> f is TimeIsOverFragment })
     }
 
     private fun getCorrectAnswerIndex(): Int {

app/src/main/java/com/example/quickmax/MainActivity.kt

 package com.example.quickmax
 
 import android.os.Bundle
+import android.os.CountDownTimer
 import android.view.View
 import android.widget.RadioButton
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import kotlinx.android.synthetic.main.activity_main.*
-import android.os.CountDownTimer
 
 class MainActivity : AppCompatActivity() {
 
@@ -22,14 +22,17 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun setTimer() {
-        object : CountDownTimer(3000, 500) {
+        object : CountDownTimer(3000, 1000) {
 
             override fun onTick(millisUntilFinished: Long) {
-                tv_time_left.text = (millisUntilFinished / 1000.0).toString()
+                tv_time_left.text = (millisUntilFinished / 1000).toString()
             }
 
             override fun onFinish() {
-                tv_time_left.text = "OVER"
+                supportFragmentManager
+                    .beginTransaction()
+                    .add(R.id.main_layout, TimeIsOverFragment.newInstance(), "time_is_over")
+                    .commitAllowingStateLoss()
             }
         }.start()
     }
@@ -48,14 +51,14 @@ class MainActivity : AppCompatActivity() {
         if (!toAcceptAnswer)
             return
         toAcceptAnswer = false
-        val responseFragment:Fragment = if (numberSet.isCorrect(answer)) {
+        val responseFragment: Fragment = if (numberSet.isCorrect(answer)) {
             ResponseCorrectFragment.newInstance()
         } else
             ResponseWrongFragment.newInstance()
 
         supportFragmentManager
             .beginTransaction()
-            .add(R.id.main_layout, responseFragment)
-            .commit()
+            .add(R.id.main_layout, responseFragment, "response")
+            .commitAllowingStateLoss()
     }
 }

app/src/main/java/com/example/quickmax/TimeIsOverFragment.kt

+package com.example.quickmax
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+class TimeIsOverFragment: Fragment() {
+    companion object {
+        fun newInstance(): TimeIsOverFragment {
+            return TimeIsOverFragment()
+        }
+    }
+
+    override fun onCreateView(inflater: LayoutInflater,
+                              container: ViewGroup?,
+                              savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_time_is_over, container, false)
+    }
+}
\ No newline at end of file

app/src/main/res/layout/fragment_response_wrong.xml

 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/response_layout"
     android:layout_width="match_parent"
     android:layout_height="120dp"