public async Task InsertProductTest()
{
//Arrange
var expected = _operations.ProductData.Count + 1;
await Task.Run(() => _operations.AddProductData("Spinach", 5, 10));
_operations.LoadProductData();
//Act
var actual = await Task.Run(() => _operations.ProductData.Count);
//Assert
Assert.That(actual, Is.EqualTo(expected));
}