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Filename :
Optional.js
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import assert from 'assert'; import {Optional, uint8, DecodeStream, EncodeStream} from 'restructure'; describe('Optional', function() { describe('decode', function() { it('should not decode when condition is falsy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, false); assert.equal(optional.decode(stream), null); assert.equal(stream.pos, 0); }); it('should not decode when condition is a function and falsy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, function() { return false; }); assert.equal(optional.decode(stream), null); assert.equal(stream.pos, 0); }); it('should decode when condition is omitted', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8); assert(optional.decode(stream) != null); assert.equal(stream.pos, 1); }); it('should decode when condition is truthy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, true); assert(optional.decode(stream) != null); assert.equal(stream.pos, 1); }); it('should decode when condition is a function and truthy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, function() { return true; }); assert(optional.decode(stream) != null); assert.equal(stream.pos, 1); }); }); describe('size', function() { it('should return 0 when condition is falsy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, false); assert.equal(optional.size(), 0); }); it('should return 0 when condition is a function and falsy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, function() { return false; }); assert.equal(optional.size(), 0); }); it('should return given type size when condition is omitted', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8); assert.equal(optional.size(), 1); }); it('should return given type size when condition is truthy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, true); assert.equal(optional.size(), 1); }); it('should return given type size when condition is a function and truthy', function() { const stream = new DecodeStream(new Uint8Array([0])); const optional = new Optional(uint8, function() { return true; }); assert.equal(optional.size(), 1); }); }); describe('encode', function() { it('should not encode when condition is falsy', function() { const optional = new Optional(uint8, false); assert.deepEqual(optional.toBuffer(128), new Uint8Array(0)); }); it('should not encode when condition is a function and falsy', function() { const optional = new Optional(uint8, function() { return false; }); assert.deepEqual(optional.toBuffer(128), new Uint8Array(0)); }); it('should encode when condition is omitted', function() { const optional = new Optional(uint8); assert.deepEqual(optional.toBuffer(128), new Uint8Array([128])); }); it('should encode when condition is truthy', function() { const optional = new Optional(uint8, true); assert.deepEqual(optional.toBuffer(128), new Uint8Array([128])); }); it('should encode when condition is a function and truthy', function() { const optional = new Optional(uint8, function() { return true; }); assert.deepEqual(optional.toBuffer(128), new Uint8Array([128])); }); }); });