[FA-misc] Translation engine work

FictionArchive.Service.TranslationService.Tests/TestSupport/TestHttpMessageHandler.cs

@@ -0,0 +1,25 @@
+namespace FictionArchive.Service.TranslationService.Tests.TestSupport;
+
+public sealed class TestHttpMessageHandler : HttpMessageHandler
+{
+    private readonly Func<HttpRequestMessage, HttpResponseMessage> _responder;
+
+    public List<HttpRequestMessage> Requests { get; } = new();
+    public List<string> RequestBodies { get; } = new();
+
+    public TestHttpMessageHandler(Func<HttpRequestMessage, HttpResponseMessage> responder)
+    {
+        _responder = responder;
+    }
+
+    protected override async Task<HttpResponseMessage> SendAsync(
+        HttpRequestMessage request, CancellationToken cancellationToken)
+    {
+        var bodyText = request.Content is null
+            ? string.Empty
+            : await request.Content.ReadAsStringAsync(cancellationToken);
+        Requests.Add(request);
+        RequestBodies.Add(bodyText);
+        return _responder(request);
+    }
+}