DRY-ing very similar specs for ASP.NET MVC controller action with MSpec (BDD guidelines)
- by spapaseit
Hi all,
I have two very similar specs for two very similar controller actions: VoteUp(int id) and VoteDown(int id). These methods allow a user to vote a post up or down; kinda like the vote up/down functionality for StackOverflow questions. The specs are:
VoteDown:
[Subject(typeof(SomeController))]
public class When_user_clicks_the_vote_down_button_on_a_post : SomeControllerContext
{
Establish context = () =>
{
post = PostFakes.VanillaPost();
post.Votes = 10;
session.Setup(s => s.Single(Moq.It.IsAny<Expression<Func<Post, bool>>>())).Returns(post);
session.Setup(s => s.CommitChanges());
};
Because of = () => result = controller.VoteDown(1);
It should_decrement_the_votes_of_the_post_by_1 = () => suggestion.Votes.ShouldEqual(9);
It should_not_let_the_user_vote_more_than_once;
}
VoteUp:
[Subject(typeof(SomeController))]
public class When_user_clicks_the_vote_down_button_on_a_post : SomeControllerContext
{
Establish context = () =>
{
post = PostFakes.VanillaPost();
post.Votes = 0;
session.Setup(s => s.Single(Moq.It.IsAny<Expression<Func<Post, bool>>>())).Returns(post);
session.Setup(s => s.CommitChanges());
};
Because of = () => result = controller.VoteUp(1);
It should_increment_the_votes_of_the_post_by_1 = () => suggestion.Votes.ShouldEqual(1);
It should_not_let_the_user_vote_more_than_once;
}
So I have two questions:
How should I go about DRY-ing these two specs? Is it even advisable or should I actually have one spec per controller action? I know I Normally should, but this feels like repeating myself a lot.
Is there any way to implement the second It within the same spec? Note that the It should_not_let_the_user_vote_more_than_once; requires me the spec to call controller.VoteDown(1) twice. I know the easiest would be to create a separate spec for it too, but it'd be copying and pasting the same code yet again...
I'm still getting the hang of BDD (and MSpec) and many times it is not clear which way I should go, or what the best practices or guidelines for BDD are. Any help would be appreciated.
