public void ByProduct_Should_Throw_ArgumentNullException_If_ProductId_Is_Empty()
{
IQueryable <ProductReview> reviews = new ProductReview[0].AsQueryable();
Guid productId = Guid.Empty;
var ex = Assert.Throws <ArgumentException>(() => ProductReviewExtensions.ByProduct(reviews, productId));
Assert.Equal(nameof(productId), ex.ParamName);
}
public void ByProduct_Should_Throw_ArgumentNullException_If_Reviews_Is_Null()
{
IQueryable <ProductReview> reviews = null;
Guid productId = Guid.NewGuid();
var ex = Assert.Throws <ArgumentNullException>(() => ProductReviewExtensions.ByProduct(reviews, productId));
Assert.Equal(nameof(reviews), ex.ParamName);
}