BeforeEach：警示
隨著專案愈來愈複雜，測試所需的前置設定也會越來越長。為了預作準備，你回到 DurationMonitorTest，並用新的註解把部分測試前置作業抽到 setup() 方法中。
使用 @BeforeEach 讓前置設定在每個測試之前執行。
本練習屬於課程
Java 測試入門
練習說明
- 用正確的註解標註
setup()方法。 - 在方法內寫入必要的前置設定：
AlertService要用 mock，DurationMonitor需接收該 mock。
動手互動練習
試著完成這個範例程式碼，體驗一下這個練習。
public class Main {
public static void main(String[] args) {
launchMockitoTestsAndPrint(DurationMonitorTest.class);
}
}
class DurationMonitorTest {
private AlertService alertService;
private DurationMonitor monitor;
// Use the correct annotation to make this method execute before every test
@____
void setUp() {
// Set up the mock alertService and the monitor as you did in the earlier exercise
this.alertService = ____(____.class);
this.monitor = new ____(alertService);
}
@Test
void recordDuration_triggersAlert_whenAboveLimit() {
this.monitor.recordDuration(1500);
verify(this.alertService).trigger("Slow execution detected: 1500ms");
}
@Test
void recordDuration_doesNotTriggerAlert_whenUnderLimit() {
this.monitor.recordDuration(500);
verifyNoInteractions(this.alertService);
}
}