Implemented HopFrame.Web tests

tests/HopFrame.Web.Tests/Extensions/HttpContextExtensions.cs

@@ -0,0 +1,29 @@
+using System.Web;
+using Microsoft.AspNetCore.Http;
+
+namespace HopFrame.Api.Tests.Extensions;
+
+internal static class HttpContextExtensions {
+    /// <summary>Extracts the partial cookie value from the header section.</summary>
+    /// <param name="headers"><inheritdoc cref="IHeaderDictionary" path="/summary"/></param>
+    /// <param name="key">The key for identifying the cookie.</param>
+    /// <returns>The value of the cookie.</returns>
+    public static string FindCookie(this IHeaderDictionary headers, string key)
+    {
+        string headerKey = $"{key}=";
+        var cookies = headers.Values
+            .SelectMany(h => h)
+            .Where(header => header.StartsWith(headerKey))
+            .Select(header => header.Substring(headerKey.Length).Split(';').First())
+            .ToArray();
+
+        //Note: cookie values in a header are encoded like a uri parameter value.
+        var value = cookies.LastOrDefault();//and the last set value, is the relevant one.
+        if (string.IsNullOrEmpty(value))
+            return null;
+
+        //That's why we should decode that last value, before we return it.
+        var decoded = HttpUtility.UrlDecode(value);
+        return decoded; 
+    }
+}