Add beginnings of tests for server

Author: rylev

tests/fixtures/request1.txt

@@ -0,0 +1,7 @@
+POST / HTTP/1.1
+Host: localhost:8080
+User-Agent: curl/7.54.0
+Accept: */*
+Content-Length: 2
+Content-Type: application/x-www-form-urlencoded
+

tests/fixtures/response1.txt

@@ -0,0 +1,3 @@
+HTTP/1.1 200 OK
+Content-Length: 0
+

tests/server.rs

@@ -0,0 +1,44 @@
+use async_h1::{server, Body};
+use async_std::task;
+use http::Response;
+use std::{fs::File, io, path::PathBuf};
+
+#[test]
+fn test_keep_alive() {
+    let request = read_fixture("request1");
+    let mut actual = Vec::new();
+    let request: &[u8] = &request;
+    let body: &[u8] = "".as_bytes();
+
+    let expected = read_fixture("response1");
+    let expected: &[u8] = &expected;
+
+    task::block_on(async {
+        server::connect(request, &mut actual, |req| {
+            async { Ok(Response::new(Body::empty(body))) }
+        })
+        .await
+        .unwrap();
+        assert!(actual == expected);
+    });
+}
+
+fn read_fixture(name: &str) -> Vec<u8> {
+    use std::io::Read;
+
+    let directory: PathBuf = env!("CARGO_MANIFEST_DIR").into();
+    let path: PathBuf = format!("tests/fixtures/{}.txt", name).into();
+    let mut file = File::open(directory.join(path)).expect("Reading fixture file didn't work");
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents)
+        .expect("Couldn't read fixture files contents");
+
+    let mut result = Vec::<u8>::new();
+    for byte in contents {
+        if byte == 0x0A {
+            result.push(0x0D);
+        }
+        result.push(byte);
+    }
+    result
+}