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describe FactoryBot::EvaluatorClassDefiner do
it "returns an evaluator when accessing the evaluator class" do
evaluator = define_evaluator(parent_class: FactoryBot::Evaluator)
expect(evaluator).to be_a(FactoryBot::Evaluator)
end
it "adds each attribute to the evaluator" do
attribute = stub_attribute(:attribute) { 1 }
evaluator = define_evaluator(attributes: [attribute])
expect(evaluator.attribute).to eq 1
end
it "evaluates the block in the context of the evaluator" do
dependency_attribute = stub_attribute(:dependency) { 1 }
attribute = stub_attribute(:attribute) { dependency + 1 }
evaluator = define_evaluator(attributes: [dependency_attribute, attribute])
expect(evaluator.attribute).to eq 2
end
it "only instance_execs the block once even when returning nil" do
count = 0
attribute = stub_attribute(:attribute) {
count += 1
nil
}
evaluator = define_evaluator(attributes: [attribute])
2.times { evaluator.attribute }
expect(count).to eq 1
end
it "sets attributes on the evaluator class" do
attributes = [stub_attribute, stub_attribute]
evaluator = define_evaluator(attributes: attributes)
expect(evaluator.attribute_lists).to eq [attributes]
end
context "with a custom evaluator as a parent class" do
it "bases its attribute lists on itself and its parent evaluator" do
parent_attributes = [stub_attribute, stub_attribute]
parent_evaluator_class = define_evaluator_class(attributes: parent_attributes)
child_attributes = [stub_attribute, stub_attribute]
child_evaluator = define_evaluator(
attributes: child_attributes,
parent_class: parent_evaluator_class
)
expect(child_evaluator.attribute_lists).to eq [parent_attributes, child_attributes]
end
end
def define_evaluator(arguments = {})
evaluator_class = define_evaluator_class(arguments)
evaluator_class.new(FactoryBot::Strategy::Null)
end
def define_evaluator_class(arguments = {})
evaluator_class_definer = FactoryBot::EvaluatorClassDefiner.new(
arguments[:attributes] || [],
arguments[:parent_class] || FactoryBot::Evaluator
)
evaluator_class_definer.evaluator_class
end
def stub_attribute(name = :attribute, &value)
value ||= -> {}
double(name.to_s, name: name.to_sym, to_proc: value)
end
end
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