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# frozen_string_literal: true
RSpec.describe Dry::Logic::Rule::Predicate do
subject(:rule) { described_class.build(predicate) }
let(:predicate) { str? }
include_context "predicates"
it_behaves_like Dry::Logic::Rule
describe "#name" do
it "returns predicate identifier" do
expect(rule.name).to be(:str?)
end
end
describe "#to_ast" do
context "without a result" do
it "returns rule ast" do
expect(rule.to_ast).to eql([:predicate, [:str?, [[:input, undefined]]]])
end
it "returns :failure with an id" do
email = rule.with(id: :email)
expect(email.(11).to_ast).to eql([:failure, [:email, [:predicate, [:str?, [[:input, 11]]]]]])
end
end
context "with a result" do
it "returns success" do
expect(rule.("foo")).to be_success
end
it "returns failure ast" do
expect(rule.(5).to_ast).to eql([:predicate, [:str?, [[:input, 5]]]])
end
end
context "with a zero-arity predicate" do
let(:predicate) {
Module.new {
def self.test?
true
end
} .method(:test?)
}
it "returns ast" do
expect(rule.to_ast).to eql([:predicate, [:test?, []]])
end
end
end
describe "#to_s" do
it "returns string representation" do
expect(rule.curry("foo").to_s).to eql('str?("foo")')
end
end
end
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