mockito官方文档地址：https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#exact_verification
// mock一个对象
List singleMock = mock(List.class);
when(singleMock.get(20))
.thenThrow(new RuntimeException()) // mock第一次调用时抛出异常
.thenReturn("foo20"); // 设定第二次调用时，返回正常值：foo20
try {
//第一次调用: throws runtime exception:
singleMock.get(20);
} catch (Exception e) {
log.error("打印预期错误RuntimeException");
}
//第二次调用: 打印 "foo20"
System.out.println(singleMock.get(20));
//任何连续呼叫：Any consecutive call: prints "foo20" as well (last stubbing wins).
System.out.println(singleMock.get(20));
// mock第二个对象
List secondMock = mock(List.class);
when(secondMock.get(50))
.thenReturn("one", "two", "three");
log.info("secondMock第一次调用：{}", secondMock.get(50)); // secondMock第一次调用：one
log.info("secondMock第二次调用：{}", secondMock.get(50)); // secondMock第二次调用：two
log.info("secondMock第三次调用：{}", secondMock.get(50)); // secondMock第三次调用：three
end.