Fix test macro that caused test runs to fail

With upstream changes to Tokio, the API for `Shutdown<'_, T>` as defined
by the `AsyncWriteExt` trait has changed. This change requires us to
await the function and then handle the result.
The macro definition was changed as a consequence.

Signed-off-by: Sayan Nandan <nandansayan@outlook.com>

Cargo.lock

@@ -373,9 +373,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a76330fb486679b4ace3670f117bbc9e16204005c4bde9c4bd372f45bed34f12"
+checksum = "c24fcd450d3fa2b592732565aa4f17a27a61c65ece4726353e000939b0edee34"
 dependencies = [
  "libc",
  "rand_chacha",

tdb-macros/src/lib.rs

@@ -67,7 +67,7 @@ fn parse_dbtest(mut input: syn::ItemFn, rand: u16) -> Result<TokenStream, syn::E
         let addr = crate::tests::start_test_server(#rand, Some(asyncdb.clone())).await;
         let mut stream = tokio::net::TcpStream::connect(&addr).await.unwrap();
         #body
-        stream.shutdown(::std::net::Shutdown::Write);
+        stream.shutdown().await.unwrap();
         asyncdb.finish_db();
         drop(asyncdb);
     };