Test get_header() with umlauts.

tests/test_headers.cpp

@@ -3,6 +3,7 @@
 #include <catch.hpp>
 
 #include <exception>
+#include <locale>
 #include <string>
 
 namespace curl_wrapper
@@ -22,17 +23,18 @@ Keep-Alive: timeout=20
 Expires: Sat, 07 Nov 2020 22:56:13 GMT
 Cache-Control: max-age=1800
 X-Cache: HIT
+X-UmläÜt: 🙂
 )";
-    const string searchfor{"cache-control"};
-
     bool exception = false;
     string value;
 
-    WHEN("We search for " + searchfor)
+    std::locale::global(std::locale("de_DE.UTF-8"));
+
+    WHEN("We search for “cache-control”")
     {
         try
         {
-            value = ret.get_header(searchfor);
+            value = ret.get_header("cache-control");
         }
         catch (const std::exception &e)
         {
@@ -46,6 +48,25 @@ X-Cache: HIT
             REQUIRE(value == "max-age=1800");
         }
     }
+
+    WHEN("We search for “X-UMLÄÜT”")
+    {
+        try
+        {
+            value = ret.get_header("X-UMLÄÜT");
+        }
+        catch (const std::exception &e)
+        {
+            exception = true;
+        }
+
+        THEN("No exception is thrown")
+        AND_THEN("The value is successfully extracted")
+        {
+            REQUIRE_FALSE(exception);
+            REQUIRE(value == "🙂");
+        }
+    }
 }
 
 } // namespace curl_wrapper