protected <T extends RuntimeException> T catches(Closure c, Class<T> rex) {
T t = null;
try {
c.f();
} catch (RuntimeException ex) {
ex.printStackTrace();
assertTrue(
ex.getClass().getName() + " is not assignable to runtime exception " + rex.getName(),
ex.getClass().isAssignableFrom(rex));
t = rex.cast(ex);
}
assertNotNull("No exception was caught of class " + rex.getName(), t);
return t;
}
