自定义规则
大多数自定义规则都是ExternalResource规则的延伸,一般情况下你需要实现TestRule接口:
实现TestRule需要自定义一个构造方法,添加的方法用于测试,并且提供一个新的Statement。比如说有一下需求:为每个测试记录日志
import java.util.logging.Logger;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
public class TestLogger implements TestRule {
private Logger logger;
public Logger getLogger() {
return this.logger;
}
@Override
public Statement apply(final Statement base, final Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
logger = Logger.getLogger(description.getTestClass().getName() + '.' + description.getDisplayName());
base.evaluate();
}
};
}
}
import java.util.logging.Logger;
import org.example.junit.TestLogger;
import org.junit.Rule;
import org.junit.Test;
public class MyLoggerTest {
@Rule
public TestLogger logger = new TestLogger();
@Test
public void checkOutMyLogger() {
final Logger log = logger.getLogger();
log.warn("Your test is showing!");
}
}