Testing with Rspec - The correct way - ruby

Question

My weakest point when it comes to coding, is using TDD & BDD methods - I tend to just write code.. but it is something that I am trying to work on.
Could anyone point out the best way to go about the following problem:
Class1:
module TempMod
class MyClass
def initalize(config)
#config = config
end
def process(xml)
if react_upon? xml.something
puts 'yeah'
else
puts 'nah'
end
end
def react_upon?(xml_code)
#code here
end
end
end
So lets say I wanted to test this class, or build it from a TDD point of view so I write my tests:
describe TempMod::MyClass do
let(:config) {double}
let(:myclass) {TempMod::MyClass.new config}
context 'Given that the xml is something we react upon' do
it 'should check that it is valid' do
myclass.process '<some><xml>here</xml></some>'
end
it 'should output yea'
end
end
How do I test that it is calling the react_upon? method. Do I even want to see it is calling it?
Is the proper way to test it, to test all the functions like the react_upon? itself independently of the other functions?
This is properly the main thing that is most confusing me with this sort of testing. Am I testing the whole class, or just individually testing the functions, and not their interactions with the other functions in that class?
Also I realize the the react_upon? might not adhere to the Single responsibility principle and I would probably move that out to its own module/class which I could test using a stub.
If anyone can shed some light on this for me that would be awesome.
edit:
describe TempMod::MyClass do
let (:valid_planning_status_xml) {
'<StatusUpdate> <TitleId>2329</TitleId> <FromStatus>Proposed</FromStatus> <ToStatus>Confirmed</ToStatus> </StatusUpdate>'
}
let(:config) { double }
let(:status_resolver) { double }
subject(:message_processor) { TempMod::MyClass.new config, status_resolver }
context 'Given that the message XML is valid' do
it 'should check the context of the message' do
expect(message_processor.process valid_planning_status_xml).to call :check_me
end
context 'Given that the message is for a planning event update' do
it 'should call something' do
pending
end
end
context 'Given that the message is for a recording job update' do
end
context 'Given that the message is for a video title update' do
end
end
end

Answer 1

Your question confused me a bit is this what you are asking
module TempMod
class MyClass
def initalize(config)
#config = config
end
def process(xml)
react_upon?(xml.something) ? 'yeah' : 'nah'
end
def react_upon?(xml_code)
#code here
end
end
end
Then test like
describe TempMod::MyClass do
let(:config) {double}
let(:myclass) {TempMod::MyClass.new config}
context 'Given that the xml is something we react upon' do
it "should respond to react_upon?" do
expect(myclass).to respond_to(:react_upon?)
end
it "should react_upon? valid xml" do
expect(myclass.react_upon?(YOUR VALID REACTION GOES HERE)).to be_true
end
it "should not react_upon? invalid xml" do
expect(myclass.react_upon?(YOUR INVALID REACTION GOES HERE)).to be_false
end
it "should say 'yeah' if it is valid" do
expect(myclass.process('<some><xml>here</xml></some>')).to eq('yeah')
end
it "should say 'nah' if it is invalid" do
expect(myclass.process('<some><xml>here</some>')).to eq('nah')
end
it 'should check the context of the message' do
expect(myclass).to receive(:react_upon?).with('<some><xml>here</xml></some>')
myclass.process('<some><xml>here</xml></some>')
end
end
end
Right now your tests have no expectations so I added one that expects myclass to respiond_to the react_upon? method and another that expects myclass.process(xml) to respond with a String that equals yeah.