106 lines
3.5 KiB
JavaScript
106 lines
3.5 KiB
JavaScript
'use strict';
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var expect = require('chai').expect;
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var BlockService = require('../../../lib/services/block');
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var LRU = require('lru-cache');
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describe('Block Service', function() {
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var blockService;
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beforeEach(function() {
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blockService = new BlockService({ node: { services: []}});
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blockService._chainTips = LRU(50);
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});
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describe('Chain Tips', function() {
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it('should merge blocks into chain tips using active chain blocks only' , function() {
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var blocks = ['aa','bb','cc','dd','ee'];
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blocks.forEach(function(n, index) {
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var buf = new Buffer('00', 'hex');
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if (index) {
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buf = new Buffer(blocks[index-1], 'hex');
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}
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var block = { header: { prevHash: buf }, hash: n };
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blockService._mergeBlockIntoChainTips(block);
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});
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expect(blockService._chainTips.length).to.equal(1);
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expect(blockService._chainTips.get('ee')).to.deep.equal(['dd', 'cc', 'bb', 'aa', '00']);
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});
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it('should merge blocks into chain tips using out of order blocks' , function() {
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var blocks = ['ee','aa','bb','dd','cc'];
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var prevBlocks = ['dd','00','aa','cc','bb'];
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blocks.forEach(function(n, index) {
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var block = { header: { prevHash: new Buffer(prevBlocks[index], 'hex') }, hash: n };
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blockService._mergeBlockIntoChainTips(block);
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});
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expect(blockService._chainTips.length).to.equal(1);
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expect(blockService._chainTips.get('ee')).to.deep.equal(['dd', 'cc', 'bb', 'aa', '00']);
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});
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it('should merge blocks where there is a fork (a parent block has more than one child)' , function() {
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var blocks = ['aa','bb','cc','dd','ee'];
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var prevBlocks = ['00','aa','aa','cc','dd'];
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blocks.forEach(function(n, index) {
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var block = { header: { prevHash: new Buffer(prevBlocks[index], 'hex') }, hash: n };
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blockService._mergeBlockIntoChainTips(block);
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});
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expect(blockService._chainTips.length).to.equal(2);
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expect(blockService._chainTips.get('ee')).to.deep.equal(['dd', 'cc', 'aa', '00']);
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expect(blockService._chainTips.get('bb')).to.deep.equal(['aa', '00']);
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});
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it('should merge blocks where there is a fork (a parent block has more than one child) and blocks are received out of order' , function() {
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var blocks = ['cc','aa','bb','ee','dd'];
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var prevBlocks = ['aa','00','aa','dd','cc'];
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blocks.forEach(function(n, index) {
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var block = { header: { prevHash: new Buffer(prevBlocks[index], 'hex') }, hash: n };
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blockService._mergeBlockIntoChainTips(block);
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});
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expect(blockService._chainTips.length).to.equal(2);
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expect(blockService._chainTips.get('ee')).to.deep.equal(['dd', 'cc', 'aa', '00']);
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expect(blockService._chainTips.get('bb')).to.deep.equal(['aa', '00']);
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});
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it('should merge blocks where there is a three-way fork (a parent block has more than one child) and blocks are received out of order' , function() {
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var blocks = ['cc','aa','bb','ee','dd'];
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var prevBlocks = ['aa','00','aa','dd','aa'];
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blocks.forEach(function(n, index) {
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var block = { header: { prevHash: new Buffer(prevBlocks[index], 'hex') }, hash: n };
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blockService._mergeBlockIntoChainTips(block);
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});
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expect(blockService._chainTips.length).to.equal(3);
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expect(blockService._chainTips.get('ee')).to.deep.equal(['dd', 'aa', '00']);
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expect(blockService._chainTips.get('bb')).to.deep.equal(['aa', '00']);
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expect(blockService._chainTips.get('cc')).to.deep.equal(['aa', '00']);
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});
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});
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});
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