hi guys,
I'm trying to pick up Rspec to port an existing application in rails
2.3.8 to rails 3.
I'm using the pragmatic "The Rspec book" (dec 2010) as a reference.
read around the book and the rspec docs.
1) assign method
- syntax: assign( <symbol name>, <block usually calling double()
or mock_model)>
- what it means to me: run the codes in the block and assign the
value evaluated to the symbol name.
2) let method
syntax: let(method_name>) { … }
- will not run until it is called
-used with before(), end() to set up usually instance variables
-the contents in its block will be evaluated when called
-here's what http://rdoc.info/gems/rspec/1.3.2/frames says when i
looked up the source for let.
------ Documentation extract for "let" (start) ----------------------
def let(name, &block)
define_method name do
@assignments ||= {}
@assignments[name] ||= instance_eval(&block)
end
end
------ Documentation extract for "let" (end) ----------------------
-to call the contents of the block, we will refer to it by the method
name (which is a symbol)
There's this example below (from the rspec book page 338) which I am
a little confused with.
------------ Extract start ----------------------------
1 require 'spec_helper'
2
3 describe "messages/new.html.erb" do
4 let(:message) do
5 mock_model("Message").as_new_record.as_null_object
6 end
7
8 before do
9 assign(:message, message)
10 end
11
12 it "renders a form to create a message" do
13 render
14 rendered.should have_selector("form",
15 :method => "post",
16 :action => messages_path
17 ) do |form|
18 form.should have_selector("input", :type => "submit")
19 end
20 end
21
22 it "renders a text field for the message title" do
23 message.stub(:title => "the title")
24 render
25 rendered.should have_selector("form") do |form|
26 form.should have_selector("input",
27 :type => "text",
28 :name => "message[title]",
29 :value => "the title"
30 )
31 end
32 end
33 end
------------ Extract end ----------------------------
My question is, line 9 seems to imply that the content of :message
(the mocked Message object) is being
assigned to the 'message' object but as per what I have read in the
Rspec book, the first argument in the call to assign() is actually the
variable that is getting assigned with.
Yet, the extract above still works when i run "rake spec".
I'm a bit confused.
Please help.
Thanks
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