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RSpec matcher for grape-entity
# Alternative: https://github.com/agileanimal/grape-entity-matchers
RSpec::Matchers.define :represent do |expected|
match do |actual|
exposes? && aliases? && has_presenter? && has_runtime_exposure?
end
chain :as do |as_alias|
@as_alias = as_alias
end
chain :using do |entity|
@entity = entity
end
chain :exposes_at_runtime do |object, exposure|
@transformation_object, @transformation_exposure = object, exposure
end
private
def exposes?
actual.exposures.key?(expected)
end
def aliases?
actual.exposures[expected][:as] == @as_alias
end
def has_presenter?
actual.exposures[expected][:using] == @entity
end
def has_runtime_exposure?
if @transformation_object && @transformation_exposure
actual.exposures[expected][:proc].call(@transformation_object) == @transformation_exposure
else
true
end
end
end
# Entities
class Value
expose :code
expose :desc, as: :description
end
class Parameter
expose :id do |parameter|
parameter.id.to_s
end
expose :variable
expose :desc, as: :description
expose :values, using: Value
end
# Specs
RSpec.describe Value do
subject { Value }
it { is_expected.to represent(:code) }
it { is_expected.to represent(:desc).as(:description) }
end
RSpec.describe Parameter do
subject { Parameter }
let(:parameter) { OpenStruct.new(id: UUIDTools::UUID.random_create) }
# One-liner syntax (https://relishapp.com/rspec/rspec-core/docs/subject/one-liner-syntax)
it { is_expected.to represent(:id).exposes_at_runtime(parameter, parameter.id.to_s) }
it { is_expected.to represent(:variable) }
it { is_expected.to represent(:desc).as(:description) }
it 'expected to represent values' do
expect(subject).to represent(:values).using(OnOff::API::Entities::Value)
end
end
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