lib/service_contract/assertions.rb
module ServiceContract
module Assertions
def assert_endpoint_response(data, endpoint, allow_nil = true)
assert_data_matches_type(data, endpoint.response_type, endpoint.name, allow_nil)
end
def assert_data_matches_type(data, type, name, allow_nil = true)
# Skip out if object is nil and allowed to be nil
return true if data.nil? && allow_nil
# basic type checking
assert type.valid_type?(data), "expected `#{data}` (#{name}) to be one of #{type.valid_ruby_types}, instead got a #{data.class.name}"
assert type.valid_value?(data), "#{data} is not an allowed value of type: #{type.name}"
# check subtype
if type.subtype
data.each do |datum|
assert_data_matches_type(datum, type.subtype, type.name, allow_nil)
end
end
# check subfields
type.fields.each do |field|
#Does data contain attributes that the contract doesn't specify?
data_extra_attrs = (data.keys.map(&:to_sym) - type.fields.map{|n| n.name.to_sym})
assert_equal 0, data_extra_attrs.size, "#{type.name} contains attributes not described in contract: #{data_extra_attrs.join(',')}"
# ensure the field is present
value = data.fetch(field.name) do
data.fetch(field.name.to_sym) do
assert false, "expected #{type.name} to have attribute: #{field.name}"
end
end
# check the data type
assert_data_matches_type(value, field.type, field.name, allow_nil)
end
end
end
end