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const {Optional, uint8, DecodeStream, EncodeStream} = require('../');
const should = require('chai').should();
const concat = require('concat-stream');
describe('Optional', function() {
describe('decode', function() {
it('should not decode when condition is falsy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, false);
should.not.exist(optional.decode(stream));
return stream.pos.should.equal(0);
});
it('should not decode when condition is a function and falsy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, function() { return false; });
should.not.exist(optional.decode(stream));
return stream.pos.should.equal(0);
});
it('should decode when condition is omitted', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8);
should.exist(optional.decode(stream));
return stream.pos.should.equal(1);
});
it('should decode when condition is truthy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, true);
should.exist(optional.decode(stream));
return stream.pos.should.equal(1);
});
return it('should decode when condition is a function and truthy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, function() { return true; });
should.exist(optional.decode(stream));
return stream.pos.should.equal(1);
});
});
describe('size', function() {
it('should return 0 when condition is falsy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, false);
return optional.size().should.equal(0);
});
it('should return 0 when condition is a function and falsy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, function() { return false; });
return optional.size().should.equal(0);
});
it('should return given type size when condition is omitted', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8);
return optional.size().should.equal(1);
});
it('should return given type size when condition is truthy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, true);
return optional.size().should.equal(1);
});
return it('should return given type size when condition is a function and truthy', function() {
const stream = new DecodeStream(Buffer.from([0]));
const optional = new Optional(uint8, function() { return true; });
return optional.size().should.equal(1);
});
});
return describe('encode', function() {
it('should not encode when condition is falsy', function(done) {
const stream = new EncodeStream;
const optional = new Optional(uint8, false);
stream.pipe(concat(function(buf) {
buf.should.deep.equal([]);
return done();
})
);
optional.encode(stream, 128);
return stream.end();
});
it('should not encode when condition is a function and falsy', function(done) {
const stream = new EncodeStream;
const optional = new Optional(uint8, function() { return false; });
stream.pipe(concat(function(buf) {
buf.should.deep.equal([]);
return done();
})
);
optional.encode(stream, 128);
return stream.end();
});
it('should encode when condition is omitted', function(done) {
const stream = new EncodeStream;
const optional = new Optional(uint8);
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from([128]));
return done();
})
);
optional.encode(stream, 128);
return stream.end();
});
it('should encode when condition is truthy', function(done) {
const stream = new EncodeStream;
const optional = new Optional(uint8, true);
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from([128]));
return done();
})
);
optional.encode(stream, 128);
return stream.end();
});
return it('should encode when condition is a function and truthy', function(done) {
const stream = new EncodeStream;
const optional = new Optional(uint8, function() { return true; });
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from([128]));
return done();
})
);
optional.encode(stream, 128);
return stream.end();
});
});
});