Github user vvysotskyi commented on the issue:
https://github.com/apache/drill/pull/904
@weijietong thanks for the explanation of your problem. I was able to
reproduce it, but also I found working solution. This mock works correctly. The
problem appears when unit test is run with other tests:
[DateTimeZone](https://github.com/JodaOrg/joda-time/blob/ba95735daf79d00ce0928f30701d691f5e029d81/src/main/java/org/joda/time/DateTimeZone.java)
class contains static field
[cDefault](https://github.com/JodaOrg/joda-time/blob/ba95735daf79d00ce0928f30701d691f5e029d81/src/main/java/org/joda/time/DateTimeZone.java#L128)
which is used to receive timezone in `testToDateForTimeStamp()` and in other
tests. When timezone does not set to this field, but method
[getDefault()](https://github.com/JodaOrg/joda-time/blob/ba95735daf79d00ce0928f30701d691f5e029d81/src/main/java/org/joda/time/DateTimeZone.java#L149)
is called, value is taken from `System.getProperty()`.
When the first test that calls this method does not have a mock, it sets a
real value of timezone from `System.getProperty()`. Therefore our test uses a
unmocked value from `cDefault`.
So lets mock `DateTimeZone.getDefault()` method:
```
new MockUp<DateTimeZone>() {
@Mock
public DateTimeZone getDefault() {
return DateTimeZone.UTC;
}
};
```
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