Tests: Add coverage tests for ScriptsBundler and StylesBundler.

VAR.WebFormsCore.Tests/Fakes/FakeWebContext.cs

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+using VAR.WebFormsCore.Code;
+
+namespace VAR.WebFormsCore.Tests.Fakes;
+
+public class FakeWebContext : IWebContext
+{
+    public string RequestPath => string.Empty;
+    
+    public string RequestMethod => string.Empty;
+    
+    public Dictionary<string, string?> RequestHeader { get; } = new();
+    
+    public Dictionary<string, string> RequestCookies { get; } = new();
+    
+    public Dictionary<string, string?> RequestQuery { get; } = new();
+    
+    public Dictionary<string, string?> RequestForm { get; } = new();
+    
+    public struct WritePackage
+    {
+        public string? Text { get; set; }
+        public byte[]? Bin { get; set; }
+    }
+
+    public List<WritePackage> FakeWritePackages { get; } = new();
+
+    public void ResponseWrite(string text)
+    {
+        FakeWritePackages.Add(new WritePackage { Text = text, });
+    }
+
+    public void ResponseWriteBin(byte[] content)
+    {
+        FakeWritePackages.Add(new WritePackage { Bin = content, });
+    }
+
+    public void ResponseFlush()
+    {
+        // NOTE: Nothing to do
+    }
+
+    public void ResponseRedirect(string url)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void AddResponseCookie(string cookieName, string value, DateTime? expiration = null)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void DelResponseCookie(string cookieName)
+    {
+        throw new NotImplementedException();
+    }
+
+    public bool ResponseHasStarted => false;
+    
+    public int ResponseStatusCode { get; set; }
+    
+    public string? ResponseContentType { get; set; }
+    
+    public void SetResponseHeader(string key, string value)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void PrepareCacheableResponse()
+    {
+        // TODO: Mark as Cacheable response
+    }
+
+    public void PrepareUncacheableResponse()
+    {
+        throw new NotImplementedException();
+    }
+}