@Test
public void doesNotRunNonexistentHealthChecks()  {

    try {
        registry.runHealthCheck("what");
        failBecauseExceptionWasNotThrown(NoSuchElementException.class);
    } catch (NoSuchElementException e) {
        assertThat(e.getMessage())
            .isEqualTo("No health check named what exists");
    }
}