Yeah, that's about what I figured, thanks. This is what I came up with:
require 'spec_helper.rb'
require 'yaml'
describe "BTree" do
describe ".load_file" do
context "when the file exists" do
before(:all) { File.open("test_file.yaml", 'w') {|f| } }
after(:all) { File.delete "test_file.yaml"}
after(:each) { BTree.load_file "test_file.yaml" }
it "parses the yaml in the file" do
YAML.stub!(:load_file).and_return(:foo)
YAML.should_receive(:load_file).with("test_file.yaml").and_return(:foo)
end
it "converts the raw data into a tree" do
fake_creator = Object.new
fake_creator.stub! :create
YAML.stub!(:load_file).and_return(:data)
BehaviorCreator.stub!(:new).and_return :tree
BehaviorCreator.should_receive(:new).with(:data).and_return
fake_creator
fake_creator.should_receive :create
end
end
context "when the file doesn't exist" do
it "raises an error" do
lambda { BTree.load_file "non_existent.yaml" }.should raise_error
end
end
end
end
On Sat, Oct 30, 2010 at 12:47 PM, John Feminella <jo...@distb.net> wrote:
> If you're writing a unit test for a method, the general rule of thumb
> is to test what the method itself does. That sounds tautological, but
> it's meant to define the boundary of what you should and shouldn't
> care about.
>
> In this case, you only care about the fact that `YAML::load_file` is
> called, and that `BehaviorTreeCreator.new` is then called with the
> result of that, and that *that* result has `create` invoked on it.
> That's it: if those three things happen, then this method is working
> as you expect.
>
> Your unit tests for BehaviorTreeCreator.new and .create will probably be
> richer.
>
> ~ jf
> --
> John Feminella
> Principal Consultant, BitsBuilder
> LI: http://www.linkedin.com/in/fjsquared
> SO: http://stackoverflow.com/users/75170/
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