diff --git a/src/test/java/WriteTest.java b/src/test/java/WriteTest.java
index de809de..c58777f 100644
--- a/src/test/java/WriteTest.java
+++ b/src/test/java/WriteTest.java
@@ -8,6 +8,7 @@ import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.List;
 
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class WriteTest {
@@ -27,7 +28,7 @@ public class WriteTest {
     }
 
     @Test
-    public void writeTest() {
+    public void writeTestPass() {
         List<String> person = new ArrayList<String>();
         person.add("Gniezno");
         person.add("Jan");
@@ -36,4 +37,17 @@ public class WriteTest {
 
         assertTrue(Write.write(file, person));
     }
+
+    @Test
+    public void writeTestFail() {
+        List<String> person = new ArrayList<String>();
+        person.add("Gniezno");
+        person.add("Jan");
+        person.add("Kowalski");
+        person.add("89042836312");
+
+        file.delete();
+
+        assertFalse(Write.write(file, person));
+    }
 }
\ No newline at end of file