test that message is sent when volcano stops smoking

src/volcano.test.c

@@ -21,6 +21,7 @@ static void test_volcano_update(CuTest *tc) {
     r = test_create_region(0, 0, t_active);
     a_add(&r->attribs, make_reduceproduction(25, 10));
     volcano_update();
+    CuAssertPtrNotNull(tc, test_find_messagetype(r->msgs, "volcanostopsmoke"));
     CuAssertPtrEquals(tc, (void *)t_volcano, (void *)r->terrain);
     test_cleanup();
 }