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Testing fail?
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# I have a class that delegates functionality to a couple of objects that it | |
# constructs. I want to test this in isolation. I want to make sure that the | |
# objects are constructed with the right arguments. I also want to make sure | |
# that the results from the objects are handled correctly. | |
# | |
# I'm finding it hard to structure the code and test in a way that isn't | |
# cumbersome. What's below works, but it feels like a lot of stubbing and setup | |
# for something the should be simpler. | |
# | |
# Anyone got a better approach for this? | |
class TopLevelValidator | |
def initialize(some_info) | |
@some_info = some_info | |
end | |
def valid? | |
validator_a = validator_a_class.new(@some_info) | |
validator_b = validator_b_class.new(@some_info) | |
validator_a.valid? && validator_b.valid? | |
end | |
private | |
def validator_a_class | |
ValidatorA | |
end | |
def validator_b_class | |
ValidatorB | |
end | |
end | |
describe TopLevelValidator do | |
let(:some_info) { stub } | |
let(:passing_validator) { stub(:valid? => true) } | |
let(:failing_validator) { stub(:valid? => false) } | |
let(:validator_a_class) { stub(:new => passing_validator) } | |
let(:validator_b_class) { stub(:new => passing_validator) } | |
subject do | |
described_class.new(some_info).tap do |validator| | |
validator.stub( | |
:validator_a_class => validator_a_class, | |
:validator_b_class => validator_b_class | |
) | |
end | |
end | |
it "passes the right info to validator A" do | |
validator_a_class.should_receive(:new).with(some_info) | |
subject.valid? | |
end | |
it "is invalid if validator A says so" do | |
validator_a_class.stub(:new => failing_validator) | |
subject.should_not be_valid | |
end | |
it "passes the right info to validator B" do | |
validator_b_class.should_receive(:new).with(some_info) | |
subject.valid? | |
end | |
it "is invalid if validator B says so" do | |
validator_b_class.stub(:new => failing_validator) | |
subject.should_not be_valid | |
end | |
it "is valid if both validators say so" do | |
subject.should be_valid | |
end | |
end |
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