updated dependency version strings, and added test for response output stream.

dub.json

@@ -4,9 +4,9 @@
 	],
 	"copyright": "Copyright © 2024, Andrew Lalis",
 	"dependencies": {
-		"handy-http-primitives": "~>1",
-		"photon": "~>0.10.2",
-		"streams": "~>3"
+		"handy-http-primitives": "~>1.2",
+		"photon": "~>0.10",
+		"streams": "~>3.5"
 	},
 	"description": "Implementations of HTTP transport protocols.",
 	"license": "CC0",

source/handy_http_transport/response_output_stream.d

@@ -100,3 +100,25 @@ struct HttpResponseOutputStream(S) if (isByteOutputStream!S) {
         return StreamResult(cast(uint) writeCount);
     }
 }
+
+// Test basic functionality for writing a standard response with headers and a
+// body.
+unittest {
+    import handy_http_primitives.response;
+
+    ArrayOutputStream!ubyte os;
+    ServerHttpResponse resp;
+    resp.status = HttpStatus.OK;
+    resp.headers.add("Content-Type", "text/plain");
+    auto httpOut = HttpResponseOutputStream!(ArrayOutputStream!ubyte*)(&os, &resp);
+    resp.outputStream = outputStreamObjectFor(httpOut);
+    StreamResult r = resp.outputStream.writeToStream(cast(ubyte[]) "Hello world!");
+    const expectedOutput =
+        "HTTP/1.1 200 OK\r\n" ~
+        "Content-Type: text/plain\r\n" ~
+        "\r\n" ~
+        "Hello world!";
+    assert(os.toArray() == expectedOutput);
+    assert(r.hasCount);
+    assert(r.count == os.toArray().length);
+}