// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "garnet/bin/guest/vmm/virtio_queue_waiter.h"

#include <lib/gtest/test_loop_fixture.h>

#include "garnet/bin/guest/vmm/virtio_device_fake.h"

namespace {

using VirtioQueueWaiterTest = ::gtest::TestLoopFixture;

TEST_F(VirtioQueueWaiterTest, Wait) {
  bool wait_complete = false;
  VirtioDeviceFake device;
  VirtioQueueWaiter waiter(dispatcher(), device.queue(),
                           [&](zx_status_t status, uint32_t events) {
                             EXPECT_EQ(ZX_OK, status);
                             wait_complete = true;
                           });

  EXPECT_EQ(ZX_OK, waiter.Begin());

  RunLoopUntilIdle();
  EXPECT_FALSE(wait_complete);

  // Signal without a descriptor should not invoke the wait callback.
  device.queue()->Notify();
  RunLoopUntilIdle();
  EXPECT_FALSE(wait_complete);

  // Add a descriptor and signal again. This should invoke the waiter.
  uint8_t buf[8];
  ASSERT_EQ(device.queue_fake()
                ->BuildDescriptor()
                .AppendReadable(buf, sizeof(buf))
                .Build(),
            ZX_OK);
  device.queue()->Notify();
  RunLoopUntilIdle();
  EXPECT_TRUE(wait_complete);
}

}  // namespace