improve some websocket error messages + add a utility function with unittest to parse status line and stop using scanf which triggers warnings on Windows

test/IXHttpTest.cpp

@@ -0,0 +1,55 @@
+/*
+ *  IXHttpTest.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2019 Machine Zone. All rights reserved.
+ */
+
+#include <iostream>
+#include <ixwebsocket/IXHttp.h>
+
+#include "catch.hpp"
+#include <string.h>
+
+namespace ix
+{
+
+TEST_CASE("http", "[http]")
+{
+    SECTION("Normal case")
+    {
+        std::string line = "HTTP/1.1 200";
+        auto result = Http::parseStatusLine(line);
+
+        REQUIRE(result.first == "HTTP/1.1");
+        REQUIRE(result.second == 200);
+    }
+
+    SECTION("http/1.0 case")
+    {
+        std::string line = "HTTP/1.0 200";
+        auto result = Http::parseStatusLine(line);
+
+        REQUIRE(result.first == "HTTP/1.0");
+        REQUIRE(result.second == 200);
+    }
+
+    SECTION("empty case")
+    {
+        std::string line = "";
+        auto result = Http::parseStatusLine(line);
+
+        REQUIRE(result.first == "");
+        REQUIRE(result.second == -1);
+    }
+
+    SECTION("empty case")
+    {
+        std::string line = "HTTP/1.1";
+        auto result = Http::parseStatusLine(line);
+
+        REQUIRE(result.first == "HTTP/1.1");
+        REQUIRE(result.second == -1);
+    }
+}
+
+}