diff --git a/app/build.gradle b/app/build.gradle
index 9d6f2cc..19d1ad6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -49,4 +49,5 @@ dependencies {
 
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    testImplementation 'org.mockito:mockito-core:2.7.22'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f5def4b..d82a8f3 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -6,6 +6,8 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 
     <application
         android:allowBackup="true"
diff --git a/app/src/main/java/com/a1/nextlocation/MainActivity.java b/app/src/main/java/com/a1/nextlocation/MainActivity.java
index 9ba6645..1ac5b68 100644
--- a/app/src/main/java/com/a1/nextlocation/MainActivity.java
+++ b/app/src/main/java/com/a1/nextlocation/MainActivity.java
@@ -6,9 +6,13 @@ import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentTransaction;
 
 import android.os.Bundle;
+import android.util.Log;
 import android.view.MenuItem;
 
 import com.a1.nextlocation.R;
+import com.a1.nextlocation.data.Coupon;
+import com.a1.nextlocation.data.FileIO;
+import com.a1.nextlocation.data.Route;
 import com.a1.nextlocation.fragments.HomeFragment;
 import com.a1.nextlocation.fragments.RouteFragment;
 import com.a1.nextlocation.fragments.SettingsFragment;
@@ -18,7 +22,12 @@ import com.a1.nextlocation.recyclerview.LocationListManager;
 import com.a1.nextlocation.recyclerview.RouteListManager;
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 
+import java.io.File;
+import java.util.Arrays;
+
 public class MainActivity extends AppCompatActivity {
+    private static final String TAG = MainActivity.class.getName();
+
     /**
      * onCreate method that creates the main activity
      * @param savedInstanceState the saved instance state of the app
@@ -31,6 +40,12 @@ public class MainActivity extends AppCompatActivity {
         BottomNavigationView bottomNav = findViewById(R.id.navbar);
         bottomNav.setOnNavigationItemSelectedListener(navListener);
 
+
+        /*System.out.println(Arrays.toString(getFilesDir().listFiles()));
+        FileIO<Route> fileIO = new FileIO<>();
+        fileIO.writeFileData(new Route("TERSTSET"), getApplicationContext());
+        Log.d(TAG, "onCreate: " + "FILE GESCHREVENN!!!!!");*/
+
         LocationListManager.INSTANCE.setContext(this);
         LocationListManager.INSTANCE.load();
         CouponListManager.INSTANCE.setContext(this);
diff --git a/app/src/main/java/com/a1/nextlocation/data/FileIO.java b/app/src/main/java/com/a1/nextlocation/data/FileIO.java
index a47f76e..33fd03e 100644
--- a/app/src/main/java/com/a1/nextlocation/data/FileIO.java
+++ b/app/src/main/java/com/a1/nextlocation/data/FileIO.java
@@ -2,17 +2,26 @@ package com.a1.nextlocation.data;
 
 import android.content.Context;
 import android.content.res.AssetManager;
+import android.os.Environment;
 import android.util.Log;
 
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
 
+import org.json.JSONArray;
+
 import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.lang.reflect.Type;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
@@ -50,7 +59,45 @@ public class FileIO<T> {
         return res;
     }
 
-    public void writeFileData(T objectToWrite) {
-        //TODO make
-    }
+//    public void writeFileData(T objectToWrite, Context context) {
+//        //TODO make
+//        //object naar jsonobject
+//        //jsonarray toevoegen/maken
+//        //filewriter naar file
+//
+//        String filename = "";
+//        if (objectToWrite instanceof Coupon){
+//            filename = "coupons.json";
+//        }
+//
+//        if (objectToWrite instanceof Route){
+//            filename = "routes.json";
+//        }
+//
+//        if (objectToWrite instanceof Location){
+//            filename = "locations.json";
+//        }
+//
+//        try (FileOutputStream fileOutputStream = context.openFileOutput(filename, Context.MODE_PRIVATE)){
+//            String json = new Gson().toJson(objectToWrite);
+//
+//            fileOutputStream.write(json.getBytes(StandardCharsets.UTF_8));
+//
+//        } catch (FileNotFoundException e) {
+//            e.printStackTrace();
+//        } catch (IOException e) {
+//            e.printStackTrace();
+//        }
+//
+//        /*try (FileWriter fileWriter = new FileWriter(filename)){
+//
+//            String json = new Gson().toJson(objectToWrite);
+//
+//            fileWriter.append(json);
+//            fileWriter.flush();
+//
+//        } catch (IOException e) {
+//            e.printStackTrace();
+//        }*/
+//    }
 }
diff --git a/app/src/test/java/com/a1/nextlocation/FileIOTest.java b/app/src/test/java/com/a1/nextlocation/FileIOTest.java
new file mode 100644
index 0000000..1f2894f
--- /dev/null
+++ b/app/src/test/java/com/a1/nextlocation/FileIOTest.java
@@ -0,0 +1,57 @@
+package com.a1.nextlocation;
+
+import android.app.Instrumentation;
+import android.content.Context;
+import android.content.pm.InstrumentationInfo;
+import android.widget.ArrayAdapter;
+
+import com.a1.nextlocation.data.FileIO;
+import com.a1.nextlocation.data.Location;
+import com.a1.nextlocation.data.Route;
+import com.google.gson.reflect.TypeToken;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.mockito.Mock;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+public class FileIOTest {
+
+//    @Test
+//    public void testReadFileIO() {
+//        //System.out.println(Arrays.toString(mMockContext.fileList()));
+//        Context mMockContext = mock(MainActivity.class);
+//        List<Route> expected = new ArrayList<>();
+//        Route testRoute = new Route("rondje stad");
+//        testRoute.addLocation(new Location("kees kroket", "2.4654645,6.2342323", "lekkere patatjes", null));
+//        testRoute.setTotalDistance(2.3434f);
+//        testRoute.setTotalTime(342342);
+//        expected.add(testRoute);
+//
+//        /*
+//        FileIO<ArrayList<Route>> fileIO = new FileIO<>();
+//        ArrayList<Route> res = fileIO.readFileData(context, "routes.json",new TypeToken<ArrayList<Route>>(){}.getType());
+//         */
+//
+//        if (mMockContext.getAssets() == null)
+//            System.out.println("daar ga je");
+//
+//        FileIO<ArrayList<Route>> fileIO = new FileIO<>();
+//        ArrayList<Route> res = fileIO.readFileData(mMockContext, "routes.json", new TypeToken<ArrayList<Route>>(){}.getType());
+//
+//        assertEquals(expected, res);
+//
+//    }
+
+}