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|
# frozen_string_literal: true
RSpec.describe Dry::Logic::Rule do
subject(:rule) { described_class.build(predicate, **options) }
let(:predicate) { -> { true } }
let(:options) { {} }
let(:schema) do
Class.new do
define_method(:class, Kernel.instance_method(:class))
def method_missing(m, *)
if m.to_s.end_with?("?")
self.class.new
else
super
end
end
def to_proc
-> value { value }
end
def arity
1
end
def parameters
[[:req, :value]]
end
end.new
end
it_behaves_like described_class
describe ".new" do
it "accepts an :id" do
expect(described_class.build(predicate, id: :check_num).id).to be(:check_num)
end
end
describe "with a function returning truthy value" do
it "is successful for valid input" do
expect(described_class.build(-> val { val }).("true")).to be_success
end
it "is not successful for invalid input" do
expect(described_class.build(-> val { val }).(nil)).to be_failure
end
end
describe "#ast" do
it "returns predicate node with :id" do
expect(described_class.build(-> value { true }).with(id: :email?).ast("oops")).to eql(
[:predicate, [:email?, [[:value, "oops"]]]]
)
end
it "returns predicate node with undefined args" do
expect(described_class.build(-> value { true }).with(id: :email?).ast).to eql(
[:predicate, [:email?, [[:value, undefined]]]]
)
end
end
describe "#type" do
it "returns rule type" do
expect(rule.type).to be(:rule)
end
end
describe "#bind" do
let(:bound) { rule.with(id: :bound).bind(object) }
context "with an unbound method" do
let(:predicate) { klass.instance_method(:test?) }
let(:klass) {
Class.new {
def test?
true
end
}
}
let(:object) { klass.new }
it "returns a new rule with its predicate bound to a specific object" do
expect(bound.()).to be_success
end
it "carries id" do
expect(bound.id).to be(:bound)
end
end
context "with an arbitrary block" do
let(:predicate) { -> value { value == expected } }
let(:object) {
Class.new {
def expected
"test"
end
} .new
}
it "returns a new with its predicate executed in the context of the provided object" do
expect(bound.("test")).to be_success
expect(bound.("oops")).to be_failure
end
it "carries id" do
expect(bound.id).to be(:bound)
end
it "stores arity" do
expect(bound.options[:arity]).to be(rule.arity)
end
it "stores parameters" do
expect(bound.options[:parameters]).to eql(rule.parameters)
end
end
context "with a schema instance" do
let(:object) { schema }
let(:predicate) { schema }
it "returns a new with its predicate executed in the context of the provided object" do
expect(bound.(true)).to be_success
expect(bound.(false)).to be_failure
end
end
end
describe "#eval_args" do
context "with an unbound method" do
let(:options) { {args: [1, klass.instance_method(:num), :foo], arity: 3} }
let(:klass) {
Class.new {
def num
7
end
}
}
let(:object) { klass.new }
it "evaluates args in the context of the provided object" do
expect(rule.eval_args(object).args).to eql([1, 7, :foo])
end
end
context "with a schema instance" do
let(:options) { {args: [1, schema, :foo], arity: 3} }
let(:object) { Object.new }
it "returns a new with its predicate executed in the context of the provided object" do
expect(rule.eval_args(object).args).to eql([1, schema, :foo])
end
end
end
describe "arity specialization" do
describe "0-arity rule" do
let(:options) { {args: [1], arity: 1} }
let(:predicate) { :odd?.to_proc }
it "generates interface with the right arity" do
expect(rule.method(:call).arity).to be_zero
expect(rule.method(:[]).arity).to be_zero
expect(rule[]).to be(true)
expect(rule.()).to be_success
end
end
describe "1-arity rule" do
let(:options) { {args: [1], arity: 2} }
let(:predicate) { -> a, b { a + b } }
it "generates interface with the right arity" do
expect(rule.method(:call).arity).to be(1)
expect(rule.method(:[]).arity).to be(1)
expect(rule[10]).to be(11)
expect(rule.(1)).to be_success
end
end
describe "currying" do
let(:options) { {args: [], arity: 2} }
let(:predicate) { -> a, b { a + b } }
let(:rule) { super().curry(1) }
it "generates correct arity on currying" do
expect(rule.method(:call).arity).to be(1)
expect(rule.method(:[]).arity).to be(1)
expect(rule[10]).to be(11)
expect(rule.(1)).to be_success
end
end
describe "arbitrary arity" do
let(:arity) { rand(1..20) }
let(:curried) { rand(arity) }
let(:options) { {args: [1] * curried, arity: arity} }
let(:predicate) { double(:predicate) }
it "generates correct arity" do
expect(rule.method(:call).arity).to be(arity - curried)
expect(rule.method(:[]).arity).to be(arity - curried)
end
end
describe "-1 arity" do
let(:options) { {args: [], arity: -1} }
it "accepts variable number of arguments" do
expect(rule.method(:call).arity).to be(-1)
expect(rule.method(:[]).arity).to be(-1)
end
end
describe "-2 arity" do
let(:options) { {args: [], arity: -2} }
it "accepts variable number of arguments" do
expect(rule.method(:call).arity).to be(-2)
expect(rule.method(:[]).arity).to be(-2)
end
context "curried 1" do
let(:options) { {args: [1], arity: -2} }
it "doesn't have required arguments" do
expect(rule.method(:call).arity).to be(-1)
expect(rule.method(:[]).arity).to be(-1)
end
end
context "curried 2" do
let(:options) { {args: [1, 2], arity: -2} }
it "doesn't have required arguments" do
expect(rule.method(:call).arity).to be(-1)
expect(rule.method(:[]).arity).to be(-1)
end
end
end
describe "constants" do
let(:options) { {args: [], arity: 0} }
it "accepts variable number of arguments" do
expect(rule.method(:call).arity).to be(-1)
expect(rule.method(:[]).arity).to be(-1)
end
end
end
end
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