谈谈单元测试中的测试桩实践 (4)
在UnitTestFirewall中也要做相应的修改，以允许在测试时，定制Clock实例。
package shannon.demo;
import thirdparty.any.NtpClock;
/**
* <code>UnitTestFirewall</code> is the facility to
* ease unit test
* @author Shannon Qian
*/
public final class UnitTestFirewall {
private static boolean debugging=false;
/**Returns true if it's in debugging mode, else false.
* @return the debugging
*/
public static boolean isDebugging() {
return debugging;
}
/**Sets Debugging flag as true if it's time to unit test.
* @param on - the debugging to set, true for on and false
* for off
*/
public static void setDebugging(boolean on) {
UnitTestFirewall.debugging = on;
}
private final static NtpClock _ntpClock=new NtpClock();
private static class NtpClockWrapper implements Clock {
public long getTime() {
return _ntpClock.getTime();
}
}
private static NtpClockWrapper ntpClock = null;
private static Clock clock = null;
/**sets the Clock instance for debugging.
* If candidate is not null, {@link #getClock()} will
* return it when debugging is true.
* @param candidate - the Clock instance for debugging
*/
public static void presetClock(Clock candidate) {
clock=candidate;
}
/**Returns the Clock instance for <code>SystemTimeSynchronizer
* </code>'s invocation.
* @return - Clock instance
*/
public static Clock getClock() {
if(debugging && clock != null) {
return clock;
} else {
if(ntpClock == null)
ntpClock = new NtpClockWrapper();
return ntpClock;
}
}
}
(未完待续)