public async Task FindAsync_CancellationToken(int id, int c1, int c2)
        {
            await _dbSet.AddRangeAsync(_list);

            var cancellationToken = new CancellationToken();

            object[] keyValues = { id };
            var      result    = await _dbSet.FindAsync(keyValues, cancellationToken);

            Assert.IsNotNull(result);
            Assert.AreEqual(id, result.AId);
            Assert.AreEqual(c1, result.C1);
            Assert.AreEqual(c2, result.C2);
        }
        public async Task AddRangeAsync()
        {
            await _dbSet.AddRangeAsync(_list);

            Assert.AreEqual(2, _dbSet.Count());
        }