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I am making a concerted effort to wrap my head around Rspec in order to move towards more of a TDD/BDD development pattern. However, I'm a long way off and struggling with some of the fundamentals: Like, when exactly should I be using mocks/stubs and when shouldn't I? Take for example this scenario: I have a Site model that has_many :blogs and the Blog model has_many :articles . In my Site model I have a callback filter that creates a default set of blogs and articles for every new site. I want to test that code, so here goes: describe Site, "when created" do include SiteSpecHelper before(:each) do @site = Site.create valid_site_attributes end it "should have 2 blogs" do @site.should have(2).blogs end it "should have 1 main blog article" do @site.blogs.find_by_slug("main").should have(1).articles end it "should have 2 secondary blog articles" do @site.blogs.find_by_slug("secondary").should have(2).articles end end Now, if I run that test, everything passes. However, it's also pretty slow as it's creating a new Site, two new Blogs and three new Articles - for every single test! So I wonder, is this a good candidate for using stubs? Let's give it a go: describe Site, "when created" do include SiteSpecHelper before(:each) do site = Site.new @blog = Blog.new @article = Article.new Site.stub!(:create).and_return(site) Blog.stub!(:create).and_return(@blog) Article.stub!(:create).and_return(@article) @site = Site.create valid_site_attributes end it "should have 2 blogs" do @site.stub!(:blogs).and_return([@blog, @blog]) @site.should have(2).blogs end it "should have 1 main blog article" do @blog.stub!(:articles).and_return([@article]) @site.stub_chain(:blogs, :find_by_slug).with("main").and_return(@blog) @site.blogs.find_by_slug("main").shou

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