Added test for libcurl https handling disabled on build server.

Linux docker image does not expose port 80

tests/slic3rutils/slic3rutils_tests_main.cpp

@@ -0,0 +1,22 @@
+#include <catch_main.hpp>
+
+#include "slic3r/Utils/Http.hpp"
+
+TEST_CASE("Http", "[Http][NotWorking]") {
+    
+    Slic3r::Http g = Slic3r::Http::get("https://github.com/");
+    
+    unsigned status = 0;
+    g.on_error([&status](std::string, std::string, unsigned http_status) {
+        status = http_status;
+    });
+    
+    g.on_complete([&status](std::string /* body */, unsigned http_status){
+        status = http_status;
+    });
+    
+    g.perform_sync();
+    
+    REQUIRE(status == 200);
+}
+