Added unit test

src/test/java/org/leolo/map/osm/extract/test/MainTest.java

@@ -2,7 +2,10 @@ package org.leolo.map.osm.extract.test;
 
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.leolo.map.osm.extract.util.InputFile;
+import org.leolo.map.osm.extract.util.InputUtil;
 
+import java.io.IOException;
 import java.util.ArrayList;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -13,4 +16,8 @@ public class MainTest {
         System.out.println("Test executed.");
     }
 
+    @Test void downloadFile() throws IOException {
+        InputFile inputFile = InputUtil.getInputFile("https://www.leolo.pro/sample");
+        assertEquals(inputFile.length(), 8192);
+    }
 }