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@ccampo133
Created March 27, 2020 15:59
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JUnit rule to set system. default time zone.
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
import java.util.TimeZone;
/**
* Sets the default time zone to be used for JUnit tests. The system default time zone is reset
* after each test method. Use it like any other JUnit rule.
*
* MIT License
*
* Copyright (c) 2020 Christopher Campo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
public class TimeZoneRule implements TestRule {
private final String timeZoneId;
public TimeZoneRule() {
this("UTC");
}
public TimeZoneRule(final String timeZoneId) {
this.timeZoneId = timeZoneId;
}
@Override
public Statement apply(final Statement base, final Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
final TimeZone defaultTimeZone = TimeZone.getDefault();
try {
TimeZone.setDefault(TimeZone.getTimeZone(timeZoneId));
base.evaluate();
} finally {
TimeZone.setDefault(defaultTimeZone);
}
}
};
}
}
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