[Copilot]

HttpClient tests were using Kestrel (real HTTP server with port binding) when TestServer (in-memory) is more appropriate. PuppeteerSharp requires real HTTP endpoints that browsers can access.

Changes

TestWebApplicationFactory

• Added ServerMode enum: TestServer (in-memory) vs Kestrel (real HTTP)
• Constructor now accepts mode parameter, defaults to TestServer
• TestServer mode: Uses UseTestServer(), returns http://localhost placeholder
• Kestrel mode: Uses UseKestrel() with dynamic port, returns actual URL like http://127.0.0.1:12345

WebAccessorTestData

• Creates two factory instances instead of one
• HttpClient tests: Use TestWebApplicationFactory(ServerMode.TestServer)
• PuppeteerSharp tests: Use TestWebApplicationFactory(ServerMode.Kestrel)

public WebAccessorTestData()
{
    // HttpClient: in-memory, no network overhead
    _testServerFactory = new TestWebApplicationFactory(ServerMode.TestServer);
    
    // PuppeteerSharp: real HTTP endpoint for browser
    _kestrelFactory = new TestWebApplicationFactory(ServerMode.Kestrel);
}

Impact

• HttpClient tests run faster (no TCP/IP overhead)
• No port allocation for HttpClient tests (eliminates port conflicts)
• PuppeteerSharp gets required real HTTP endpoint

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