"use strict";

const equals = require("../../src/deps/fp/equals");

const where = require("../../src/deps/fp/where");

const eq = (x, y) => expect(x).toEqual(y);

describe('where', function () {
  it('returns true if the test object satisfies the spec', function () {
    var spec = {
      x: equals(1),
      y: equals(2)
    };
    var test1 = {
      x: 0,
      y: 200
    };
    var test2 = {
      x: 0,
      y: 10
    };
    var test3 = {
      x: 1,
      y: 101
    };
    var test4 = {
      x: 1,
      y: 2
    };
    eq(where(spec, test1), false);
    eq(where(spec, test2), false);
    eq(where(spec, test3), false);
    eq(where(spec, test4), true);
  });
  it('does not need the spec and the test object to have the same interface (the test object will have a superset of the specs properties)', function () {
    var spec = {
      x: equals(100)
    };
    var test1 = {
      x: 20,
      y: 100,
      z: 100
    };
    var test2 = {
      w: 1,
      x: 100,
      y: 100,
      z: 100
    };
    eq(where(spec, test1), false);
    eq(where(spec, test2), true);
  });
  it('matches specs that have undefined properties', function () {
    var spec = {
      x: equals(undefined)
    };
    var test1 = {};
    var test2 = {
      x: null
    };
    var test3 = {
      x: undefined
    };
    var test4 = {
      x: 1
    };
    eq(where(spec, test1), true);
    eq(where(spec, test2), false);
    eq(where(spec, test3), true);
    eq(where(spec, test4), false);
  });
  it('is curried', function () {
    var predicate = where({
      x: equals(1),
      y: equals(2)
    });
    eq(predicate({
      x: 1,
      y: 2,
      z: 3
    }), true);
    eq(predicate({
      x: 3,
      y: 2,
      z: 1
    }), false);
  });
  it('is true for an empty spec', function () {
    eq(where({}, {
      a: 1
    }), true);
  });
  it('matches inherited properties', function () {
    var spec = {
      toString: equals(Object.prototype.toString),
      valueOf: equals(Object.prototype.valueOf)
    };
    eq(where(spec, {}), true);
  });
  it('does not match inherited spec', function () {
    function Spec() {
      this.y = equals(6);
    }

    Spec.prototype.x = equals(5);
    var spec = new Spec();
    eq(where(spec, {
      y: 6
    }), true);
    eq(where(spec, {
      x: 5
    }), false);
  });
});