Bad error message when creating a wiki and the id is a reserved one

    @Test
    void createWhenWikiIdIsForbidden() throws Exception
    {
        // The wiki does not already exist
        when(this.wikiDescriptorManager.exists("wikiid1")).thenReturn(false);

        // Forbidden list
        when(this.xwiki.Param("xwiki.virtual.reserved_wikis")).thenReturn("forbidden,wikiid1");

        Throwable exception = assertThrows(WikiManagerException.class, () -> {
            this.wikiManager.create("wikiid1", "wikialias1", true);
        });
        assertEquals("wiki id [wikiid1] is already used and is thus not available", exception.getMessage());
    }