implement writeFile storage method

src/main/java/Storage.java

@@ -1,3 +1,7 @@
+import java.io.BufferedWriter;
+import java.io.FileWriter;
+import java.io.IOException;
+
 public class Storage implements StorageInterface {
     @Override
     public void export() {
@@ -11,6 +15,15 @@ public class Storage implements StorageInterface {
 
     public boolean writeFile(String path, String content) {
         if (!path.isEmpty() && !content.isEmpty()) {
+            try {
+                BufferedWriter writer = new BufferedWriter(new FileWriter(path, false));
+                writer.append(content);
+                writer.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+                return false;
+            }
+
             return true;
         }
         return false;

src/test/java/StorageTest.java

@@ -1,17 +1,27 @@
+import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
+import java.io.File;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 class StorageTest {
 
     static Storage storage;
+    static String testFilePath = "/tmp/test.txt";
 
     @BeforeAll
     static void init() {
         storage = new Storage();
     }
 
+    @AfterAll
+    static void clear() {
+        File myObj = new File(testFilePath);
+        myObj.delete();
+    }
+
     @Test
     void constructor() {
         assertInstanceOf(Storage.class, storage);
@@ -27,6 +37,10 @@ class StorageTest {
 
     @Test
     void writeFile() {
-        assertTrue(storage.writeFile("/tmp/test.txt", "test"));
+        String content = "test";
+        assertTrue(storage.writeFile(testFilePath, content));
+
+        File f = new File(testFilePath);
+        assertTrue(f.isFile());
     }
 }