diff --git a/core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/inttostring/IntToStringUnitTest.java b/core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/inttostring/IntToStringUnitTest.java
new file mode 100644
index 0000000000..b865d0933d
--- /dev/null
+++ b/core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/inttostring/IntToStringUnitTest.java
@@ -0,0 +1,29 @@
+package com.baeldung.chararraytostring;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class IntToStringUnitTest {
+
+    @Test
+    public void whenValidIntIsPassed_thenShouldConvertToString() {
+        assertEquals("11", Integer.toString(11)); 
+        assertEquals("11", Integer.toString(+11)); 
+        assertEquals("-11", Integer.toString(-11));
+    }
+    
+    @Test
+    public void whenValidIntIsPassed_thenShouldConvertToValidString() {
+        assertEquals("11", String.valueOf(11)); 
+        assertEquals("11", String.valueOf(+11));
+        assertEquals("-11", String.valueOf(-11));
+    }
+    
+    @Test(expected = NullPointerException.class)
+    public void whenNullIntegerObjectIsPassed_thenShouldThrowException() {
+        Integer i = null;
+        System.out.println(String.valueOf(i)); // it prints "null"
+        System.out.println(i.toString()); 
+    }
+}