diff --git a/src/test/java/com/h2/Module06_Test.java b/src/test/java/com/h2/Module06_Test.java
index 0b510b81a..0d2686a90 100644
--- a/src/test/java/com/h2/Module06_Test.java
+++ b/src/test/java/com/h2/Module06_Test.java
@@ -3,6 +3,7 @@
 import org.junit.jupiter.api.Test;
 import org.junit.platform.commons.function.Try;
 
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Optional;
 
@@ -12,6 +13,7 @@
 public class Module06_Test {
     private final String classToFind = "com.h2.Utilities";
 
+
     public Optional<Class<?>> getUtilitiesClass() {
         Try<Class<?>> aClass = tryToLoadClass(classToFind);
         return aClass.toOptional();
@@ -43,4 +45,32 @@ public void m6_02_testGetLongValueExistence() {
             fail("Can't find a method with name " + methodName + " in class " + classToFind + " with 1 parameter of type 'String'");
         }
     }
+
+    @Test
+    public void m6_03_testGetLongValueCorrectness() throws IllegalAccessException, InvocationTargetException {
+        final String methodName = "getLongValue";
+        final Optional<Class<?>> maybeClass = getUtilitiesClass();
+        assertTrue(maybeClass.isPresent(), classToFind + " should be present");
+        assertEquals(classToFind, maybeClass.get().getCanonicalName());
+
+        final Class<?> aClass = maybeClass.get();
+        try {
+            Method method = aClass.getMethod(methodName, String.class);
+            {
+                long result = (long) method.invoke(null, "123");
+                assertEquals(123L, result, methodName + " should convert '123' into '123L'");
+            }
+            {
+                String input = "1.22";
+                final InvocationTargetException exception = assertThrows(InvocationTargetException.class, () -> method.invoke(null, input));
+                Throwable targetException = exception.getTargetException();
+                assertEquals(IllegalArgumentException.class, targetException.getClass(), methodName + " should have thrown an instance of 'IllegalArgumentException'");
+                assertEquals(input + " cannot be converted into a 'long' value. Exiting program.", targetException.getMessage());
+            }
+
+        } catch (NoSuchMethodException e) {
+            fail("Can't find a method with name " + methodName + " in class " + classToFind + " with 1 parameter of type 'String'");
+        }
+
+    }
 }