Junit 断言失败的 HTTP 发布请求

Question

我对我的 spring boot 应用程序进行了 HTTPClient 测试。如果对服务器的 POST 请求是 2048 字节或以上的字符串，我有一个类会抛出异常。

@Component

 public class ApplicationRequestSizeLimitFilter extends OncePerRequestFilter {

    @Override

    protected void doFilterInternal(HttpServletRequest request,

            HttpServletResponse response, FilterChain filterChain)

                    throws ServletException, IOException {

        System.out.println(request.getContentLength());

        if (request.getContentLengthLong() >= 2048) {

            throw new IOException("Request content exceeded limit of 2048 bytes");

        }

        filterChain.doFilter(request, response);

    }

}

我为它创建了一个单元测试，但我不确定如何编写断言语句来检查它是否无法发布请求。

到目前为止，我的测试课上有这个

@Test

    public void testSize() throws ClientProtocolException, IOException {

        Random r = new Random(123);

        long start = System.currentTimeMillis();

        String s = "";

        for (int i = 0; i < 65536; i++)

            s += r.nextInt(2);

        String result = Request.Post(mockAddress)

                .connectTimeout(2000)

                .socketTimeout(2000)

                .bodyString(s, ContentType.TEXT_PLAIN)

                .execute().returnContent().asString();

    }

该测试失败了，这正是我想要的，但我想创建一个断言以使其通过（断言由于超过字节限制而导致 http 响应失败）。

Answer 1

您可以用 try/catch 包围失败的部分，并在 try 块的末尾调用 fail()。如果抛出异常，则不应到达 fail() 指令，并且您的测试应该通过。

Answer 2

@Test有一个参数断言一个特定的异常被抛出，你可以像这样编写你的测试：&nbsp; &nbsp; @Test(expected = IOException.class)&nbsp; &nbsp; public void testSize() throws ClientProtocolException, IOException {&nbsp; &nbsp; ...&nbsp; &nbsp; }

Answer 3

您可以通过 3 种方式实现这一目标：1）@Test(expected = ....在提供要检查的异常类的地方使用 ) 注释。@Test(expected = IOException.class)public void test() {&nbsp; //... your test logic}这不是异常测试的推荐方法，除非您的测试真的很小并且只做一件事。否则，您可能会抛出异常IOException，但您无法确定是测试代码的哪一部分引起的。2）@Rule对类使用注解ExpectedException：@Rulepublic ExpectedException exceptionRule = ExpectedException.none();@Testpublic void testExpectedException() {&nbsp; &nbsp; exceptionRule.expect(IOException.class);&nbsp; &nbsp; exceptionRule.expectMessage("Request too big.");//... rest of your test logic here}请注意，exceptionRule必须是public。3）最后一个，很老式的方式：@Testpublic void test() {&nbsp; try {&nbsp; &nbsp; // your test logic&nbsp; &nbsp; fail(); // if we get to that point it means that exception was not thrown, therefore test should fail.&nbsp; } catch (IOException e) {&nbsp; &nbsp; // if we get here, test is successfull and code seems to be ok.&nbsp; }}这是一种老式的方法，它会在本应干净的测试中添加一些不必要的代码。

Answer 4

还有另一种解决方案，尚未在这些答案中提出，这是我个人的偏好。assertThatThrownBy 断言在你的情况下@Testpublic void testSizeException(){&nbsp; assertThatThrownBy(()-> Request.Post(mockAddress)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .connectTimeout(2000)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .socketTimeout(2000)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .bodyString(s, ContentType.TEXT_PLAIN)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .execute().returnContent().asString())&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .isInstanceOf(IOException.class)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .hasMessageContaining("Request content exceeded limit of 2048&nbsp;&nbsp; bytes");}