test: 新增 tests 单元测试文件夹

tests/test_http_request.cpp

@@ -0,0 +1,20 @@
+#include <http/http_response.hpp>
+
+#include <string>
+#include <iostream>
+
+int main()
+{
+    std::string body = "Hello HTTP!";
+
+    auto builder = ouc_server::http::HttpResponse::create();
+    auto res =
+        builder.body(body)
+            .header("Content-Length", std::to_string(body.size()))
+            .header("Content-Type", "text/plain")
+            .build();
+
+    printf("%s\n", res.to_string().c_str());
+
+    return 0;
+}