@Test
    void verifyToString() {
        val stat = new SimpleCacheStatistics(100, 110, 0, "test");
        assertNotNull(stat.toString(new StringBuilder()));
    }
Unit test for {@link AbstractCacheHealthIndicator}.

@author Marvin S. Addison
@since 3.5.1
core/cas-server-core-monitor/src/test/java/org/apereo/cas/monitor/CacheHealthIndicatorTests.java