nxt_unit_app_test.c: Test what happens if we lie in the Content-LengthHEADmain

As expected, Unit just sends what you said:

$ echo -e 'GET / HTTP/1.1\r\nHost: _\n' | ncat localhost 80;
HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 42
Server: Unit/1.30.0
Date: Sat, 20 May 2023 21:05:06 GMT

Hello world!
Request data:
  Method: GET
  Protocol: HTTP/1.1
  Remote addr: 127.0.0.1
  Local addr: 127.0.0.1
  Target: /
  Path: /
  Fields:
    Host: _
But send this first.
Some extra contents.
And some more

Signed-off-by: Alejandro Colomar <alx@kernel.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/nxt_unit_app_test.c b/src/nxt_unit_app_test.c
index 886a31d..9233513 100644
--- a/src/nxt_unit_app_test.c
+++ b/src/nxt_unit_app_test.c
@@ -155,9 +155,11 @@ greeting_app_request_handler(nxt_unit_request_info_t *req)
     nxt_unit_request_t  *r;
 
     rc = nxt_unit_response_init(req, 200 /* Status code. */,
-                                1 /* Number of response headers. */,
+                                2 /* Number of response headers. */,
                                 strlen(CONTENT_TYPE)
                                 + strlen(TEXT_PLAIN)
+                                + strlen("Content-Length")
+                                + strlen("42")
                                 + strlen("Hello world\n!"));
     if (nxt_slow_path(rc != NXT_UNIT_OK)) {
         goto fail;
@@ -170,6 +172,13 @@ greeting_app_request_handler(nxt_unit_request_info_t *req)
         goto fail;
     }
 
+    rc = nxt_unit_response_add_field(req,
+                                     "Content-Length", strlen("Content-Length"),
+                                     "42", strlen("42"));
+    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
+        goto fail;
+    }
+
     rc = nxt_unit_response_add_content(req, "Hello", strlen("Hello"));
     if (nxt_slow_path(rc != NXT_UNIT_OK)) {
         goto fail;