var List = require('../lib/list');

var Kernel = require('../lib/kernel');

var expect = require('chai').expect;

describe('List', function(){

describe('duplicate', function(){

it('must make a tuple with the value duplicated the specified amount of times', function(){

let t = List.duplicate("value", 3);

expect(t.length).to.equal(3);

expect(t[0]).to.equal("value");

expect(t[1]).to.equal("value");

expect(t[2]).to.equal("value");

t = List.duplicate("value", 0);

expect(t.length).to.equal(0);

})

})

describe('delete_at', function(){

it('must delete first item', function(){

let t = Kernel.SpecialForms.list(1, 2, 3);

t = List.delete_at(t, 0);

expect(t[0]).to.equal(2);

})

})

describe('delete', function(){

it('delete item in list', function(){

let t = Kernel.SpecialForms.list(Kernel.SpecialForms.atom("a"), Kernel.SpecialForms.atom("b"), Kernel.SpecialForms.atom("c"));

t = List.delete(t, Kernel.SpecialForms.atom("b"));

expect(t[1]).to.equal(Kernel.SpecialForms.atom("c"));

})

})

describe('flatten', function(){

it('must flatten a list into one list', function(){

let t = Kernel.SpecialForms.list(1, Kernel.SpecialForms.list(2), 3);

t = List.flatten(t);

expect(t[0]).to.equal(1);

expect(t[1]).to.equal(2);

expect(t[2]).to.equal(3);

})

it('must flatten a deeply nested list into one list', function(){

let t = Kernel.SpecialForms.list(1, Kernel.SpecialForms.list(2, Kernel.SpecialForms.list(4)), 3);

t = List.flatten(t);

expect(t[0]).to.equal(1);

expect(t[1]).to.equal(2);

expect(t[2]).to.equal(4);

expect(t[3]).to.equal(3);

})

})

describe('toString', function(){

it('must display correctly', function(){

let t = Kernel.SpecialForms.list(1, 2, 3);

expect(t.toString()).to.equal('1,2,3');

})

})

describe('destructuring', function(){

it('destructure into an array', function(){

let t = Kernel.SpecialForms.list(1, 2, 3);

let [a, b, c] = t;

expect(a).to.equal(1);

expect(b).to.equal(2);

expect(c).to.equal(3);

})

})

})