Many developers are convinced that their language, tool or library is the best. They think that C is better than Pascal, Python is better Ruby, and Git is much better than SVN. Among the editors, some prefer VIM over Emacs, while others only like Textmate or JEdit. The preference for certain languages, tools and frameworks can be very subjective, some like this tool, some like that, while others prefer something completely different. Often you like the tool you are used to, because you know how to use it well. Luckily we have the choice between various tools and frameworks, which are often equally powerful. Python is very similar to Ruby, and VIM is just as uncomfortable (or powerful) as Emacs. RSpec and the classic Test::Unit are another good example, both are equally powerful and more or less isomorphic, i.e. similar in form, function and relations.

Test::Unit RSpec
Existence assert assigns(:object) assigns(:object).should be
assigns(:object).should_not == nil
Matching assert_match object object.should match(expected)
Equality assert_equal object.text,text object.text.should eq(text)
Validity assert object.valid?
assert !object.valid?
object.should be_valid
object.should_not be_valid
Collections assert collection.include?(object)
assert !collection.include?(object)
assert_equal collection.count, count
collection.should include(object)
collection.should_not include(object)
collection.should have(count).items
HTTP Response assert_response :success
assert_response :redirect
response.should be_success
response.should be_redirect
Redirect assert_redirected_to posts_url response.should redirect_to(posts_url)
Templates assert_template “posts/index” response.should render_template(“posts/index”)
Selectors assert_select “h1”, :text => /Headline/
assert_select “div[id=main]”
response.should have_selector(“h1”, /Headline/)
response.should have_tag(‘div#main’)

(The have_tag or have_selector methods are not part of RSpec and are defined in Webrat and/or Capybara.)

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