英文:
Jacoco is not able to cover a class containing only static methods
问题
Jacoco无法覆盖仅包含静态方法的类。我在测试类中没有实例化该类，而是直接调用了静态方法进行测试。
public class DateUtil {
final static String datePattern = "EEE MM/dd/yyyy";
public static String convertToGMTDate(Date date) {
DateFormat df = new SimpleDateFormat(datePattern, Locale.getDefault());
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df.format(date);
}
}
class DateUtilTest {
static DateUtil dateutil;
@Test
void convertToGMTDate() {
Date date = new GregorianCalendar(2020, Calendar.FEBRUARY, 11).getTime();
String stringDate = dateutil.convertToGMTDate(date);
assertEquals("Tue 02/11/2020", stringDate);
}
}
错误报告仅突出显示了类名"DateUtil"，并报告其覆盖率为75%。如何才能使该类的覆盖率达到100%？
在测试方法中不实例化该类会降低覆盖率25%。这有何意义？这是JaCoCo的缺陷吗？
提前致谢！
英文:
Jacoco is not able to cover a class containing only static methods. I did not instantiate the class in the test class rather directly called the static method to test.
public class DateUtil {
final static String datePattern = "EEE MM/dd/yyyy";
public static String convertToGMTDate(Date date ) {
DateFormat df = new SimpleDateFormat(datePattern, Locale.getDefault());
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df.format(date);
}
}
class DateUtilTest {
static DateUtil dateutil;
@Test
void convertToGMTDate() {
Date date = new GregorianCalendar(2020, Calendar.FEBRUARY, 11).getTime();
String stringDate = dateutil.convertToGMTDate(date);
assertEquals("Tue 02/11/2020)",stringDate);
}
}
The error report highlighted just the class name "DateUtil" and reported that its 75% covered. What to do for the class to cover completely 100%?
Not instantiating the class in test method, decreases the coverage by 25% here. How does it makes sense? Is it flaw with JaCoCo?
Thanks in advance!
答案1
得分: 14
“缺失”的覆盖率确实来自于默认构造函数。
由于您的 `DateUtil` 类只是一个实用（或辅助）类，请像这样添加一个私有构造函数：
private DateUtil() {
// 实用类
}
（请注意，这种类通常也会被声明为 `final`）
然后，JaCoCo 应该期望其覆盖率达到100%。
英文:
The "missing" coverage is indeed from the default constructor.
Since your DateUtil class is just a Utility (or helper) class, add a private constructor to it, like so:
private DateUtil() {
// Utility class
}
(note that such classes are also usually declared final)
JaCoCo should then expect it to be 100% covered.
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