在JUnit测试中重复代码 [英] Repeating code in JUnit tests

问题描述

在测试类中复制代码是坏吗？如您所见，我将驾驶记录添加到驾驶记录中，以便在多种方法中进行测试。将它提取到私有帮助器方法是否更好？或者更清楚地保持它是否像它一样？在这种情况下你会怎么做？

Is it "bad" to duplicate code in the testclass? As you see I add drivingrecords to the drivinglog to have something to test on in multiple methods. Is it better to extract this to a private helper method or is it better for clarity to keep it like it is? What do you do in such cases?

@Test
public void shouldRemoveAllDrivingRecords() {
    Duration duration1 = new Duration(1, 30, 45);
    Duration duration2 = new Duration(2, 50, 12);

    DrivingRecord drivingRecord1 = new DrivingRecord(230.0, duration1, "This was a long trip");
    DrivingRecord drivingRecord2 = new DrivingRecord(300.0, duration2, "This trip is even longer.");

    drivingLog.addDrivingRecord(drivingRecord1);
    drivingLog.addDrivingRecord(drivingRecord2);

    drivingLog.removeAllDrivingLogs();

    assertEquals(0, drivingLog.numberOfDrivingRecords());
}

@Test
public void shouldSumTheDistanceDriven() {
    Duration duration1 = new Duration(1, 30, 45);
    Duration duration2 = new Duration(2, 50, 12);

    DrivingRecord drivingRecord1 = new DrivingRecord(230.0, duration1, "This was a long trip");
    DrivingRecord drivingRecord2 = new DrivingRecord(300.0, duration2, "This trip is even longer.");

    drivingLog.addDrivingRecord(drivingRecord1);
    drivingLog.addDrivingRecord(drivingRecord2);

    double expectedDistanceDriven = drivingRecord1.getDistance() + drivingRecord2.getDistance();
    double totalDistanceDriven = drivingLog.getDistanceDriven();

    assertEquals(expectedDistanceDriven, totalDistanceDriven, 0.1);
}

推荐答案

复制不好任何代码。此代码是否因某种原因而重复，或仅仅是为了方便。如果有一个原因，你想在两者中使用相同的数据并以相同的方式添加它，那么一个小的设置方法是有意义的。

It's "bad" to duplicate code anywhere. Is this code duplicated for a reason or was it simply convenience. If there's a reason yoy want to use the same data in both and add it the same way, then a wee "setup" method makes sense.

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