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# frozen_string_literal: true
RSpec.describe Dry::Logic::Operations::Negation do
subject(:operation) { described_class.new(is_int) }
include_context "predicates"
let(:is_int) { Dry::Logic::Rule::Predicate.build(int?) }
describe "#call" do
it "negates its rule" do
expect(operation.("19")).to be_success
expect(operation.(17)).to be_failure
end
context "double negation" do
subject(:double_negation) { described_class.new(operation) }
it "works as rule" do
expect(double_negation.("19")).to be_failure
expect(double_negation.(17)).to be_success
end
end
end
describe "#to_ast" do
it "returns ast" do
expect(operation.to_ast).to eql(
[:not, [:predicate, [:int?, [[:input, undefined]]]]]
)
end
it "returns result ast" do
expect(operation.(17).to_ast).to eql(
[:not, [:predicate, [:int?, [[:input, 17]]]]]
)
end
it "returns result ast with an :id" do
expect(operation.with(id: :age).(17).to_ast).to eql(
[:failure, [:age, [:not, [:predicate, [:int?, [[:input, 17]]]]]]]
)
end
end
describe "#to_s" do
it "returns string representation" do
expect(operation.to_s).to eql("not(int?)")
end
end
end
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