JUnit默认不会控制用例的执行顺序，执行顺序由运行时查找到的用例列表的顺序决定。
如果有我们有一系列的用例，同时希望这些用例以一定的顺序执行，可以在类上添加注解：
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
使JUnit以字母序列的方式执行用例。接着便是以一定的顺序，命名用例即可。
其他可选值
/**
* Sort the methods into a specified execution order.
* Defines common {@link MethodSorter} implementations.
*
* @since 4.11
*/
public enum MethodSorters {
/**
* Sorts the test methods by the method name, in lexicographic order,
* with {@link Method#toString()} used as a tiebreaker
*/
NAME_ASCENDING(MethodSorter.NAME_ASCENDING),
/**
* Leaves the test methods in the order returned by the JVM.
* Note that the order from the JVM may vary from run to run
*/
JVM(null),
/**
* Sorts the test methods in a deterministic, but not predictable, order
*/
DEFAULT(MethodSorter.DEFAULT);
private final Comparator<Method> comparator;
private MethodSorters(Comparator<Method> comparator) {
this.comparator = comparator;
}
public Comparator<Method> getComparator() {
return comparator;
}
}
