message: NXTTest: Configure the swapchain
  Otherwise when trying to use SwapBuffersForCapture a device error is
  generated.
diff: @@ -142,6 +142,7 @@ void NXTTest::SetUp() {
  swapchain = device.CreateSwapChainBuilder()
  .SetImplementation(binding->GetSwapChainImplementation())
  .GetResult();
  + swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, 400, 400);
  device.SetErrorCallback(DeviceErrorCauseTestFailure, 0);
  }
  