if (false) {
String value;
SystemProperties.set(KEY, "");
value = SystemProperties.get(KEY, "default");
assertEquals("default", value);
SystemProperties.set(KEY, "AAA");
value = SystemProperties.get(KEY, "default");
assertEquals("AAA", value);
value = SystemProperties.get(KEY);
assertEquals("AAA", value);
SystemProperties.set(KEY, "");
value = SystemProperties.get(KEY, "default");
assertEquals("default", value);
value = SystemProperties.get(KEY);
assertEquals("", value);
}