@Test
void evaluateWhenNotInitialized()
{

    Throwable exception = assertThrows(XWikiVelocityException.class, () -> {
        this.engine.evaluate(null, new StringWriter(), null, (Reader) null);
    });
    assertEquals("This Velocity Engine has not yet been initialized. "
        + "You must call its initialize() method before you can use it.", exception.getMessage());
}