add form-urlencoded unit test

.travis.yml

@@ -43,6 +43,10 @@ matrix:
 sudo: false
 dist: trusty
 
+env:
+  global:
+    - REQWEST_TEST_BODY_FULL=1
+
 script:
   - cargo build $FEATURES
   - cargo test -v $FEATURES

tests/client.rs

@@ -172,6 +172,41 @@ fn test_post() {
     assert_eq!(n, 0)
 }
 
+#[test]
+fn test_post_form() {
+    let server = server! {
+        request: b"\
+            POST /form HTTP/1.1\r\n\
+            user-agent: $USERAGENT\r\n\
+            accept: */*\r\n\
+            content-type: application/x-www-form-urlencoded\r\n\
+            content-length: 24\r\n\
+            accept-encoding: gzip\r\n\
+            host: $HOST\r\n\
+            \r\n\
+            hello=world&sean=monstar\
+            ",
+        response: b"\
+            HTTP/1.1 200 OK\r\n\
+            Server: post-form\r\n\
+            Content-Length: 0\r\n\
+            \r\n\
+            "
+    };
+
+    let form = &[("hello", "world"), ("sean", "monstar")];
+
+    let url = format!("http://{}/form", server.addr());
+    let res = reqwest::Client::new()
+        .post(&url)
+        .form(form)
+        .send()
+        .expect("request send");
+
+    assert_eq!(res.url().as_str(), &url);
+    assert_eq!(res.status(), reqwest::StatusCode::OK);
+}
+
 /// Calling `Response::error_for_status`` on a response with status in 4xx
 /// returns a error.
 #[test]

tests/support/server.rs

@@ -99,13 +99,15 @@ pub fn spawn(txns: Vec<Txn>) -> Server {
 
             match (::std::str::from_utf8(&expected), ::std::str::from_utf8(&buf[..n])) {
                 (Ok(expected), Ok(received)) => {
-                    assert_eq!(
-                        expected.len(),
-                        received.len(),
-                        "expected len = {}, received len = {}",
-                        expected.len(),
-                        received.len(),
-                    );
+                    if expected.len() > 300 && ::std::env::var("REQWEST_TEST_BODY_FULL").is_err() {
+                        assert_eq!(
+                            expected.len(),
+                            received.len(),
+                            "expected len = {}, received len = {}; to skip length check and see exact contents, re-run with REQWEST_TEST_BODY_FULL=1",
+                            expected.len(),
+                            received.len(),
+                        );
+                    }
                     assert_eq!(expected, received)
                 },
                 _ => {