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test.js
148 lines (128 loc) · 4.76 KB
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test.js
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var expect = require('chai').expect;
var Stream = require('stream');
var CMM = require('./index');
describe('cmm', function() {
describe('registers', function() {
it('should have width * depth registers', function() {
var c = new CMM(2, 2);
expect(c.registers.length).to.be.equal(4);
c = new CMM(3, 2);
expect(c.registers.length).to.be.equal(6);
c = new CMM(3, 3);
expect(c.registers.length).to.be.equal(9);
c = new CMM(4, 3);
expect(c.registers.length).to.be.equal(12);
});
it('should have zeroed registers', function() {
var c = new CMM(3, 3);
for (var i = 0; i < c.registers.length; i++) {
expect(c.registers[i]).to.be.equal(0);
}
});
});
describe('import/export', function() {
it('should export', function(done) {
makeCmm(10, 10, 10, 'murmur', 'buffers', function(cmm) {
var data = cmm.export();
expect(data.width).to.equal(cmm.width);
expect(data.depth).to.equal(cmm.depth);
expect(data.hashType).to.equal(cmm.hashType);
expect(data.registers.length).to.equal(cmm.registers.length);
expect(data.registers).not.to.equal(cmm.registers);
done();
});
});
it('should import exported data', function(done) {
makeCmm(10, 10, 10, 'murmur', 'buffers', function(cmm, element) {
var newCmm = new CMM();
newCmm.import(cmm.export());
expect(newCmm.width).to.equal(cmm.width);
expect(newCmm.depth).to.equal(cmm.depth);
expect(newCmm.size).to.equal(cmm.size);
expect(newCmm.hashType).to.equal(cmm.hashType);
expect(newCmm.registers.length).to.equal(cmm.registers.length);
expect(newCmm.registers).not.to.equal(cmm.registers);
expect(newCmm.frequency(element)).to.equal(cmm.frequency(element));
done();
});
});
});
describe('merge', function() {
it('should merge', function(done) {
makeCmm(20, 20, 10, 'murmur', 'buffers', function(cmm1) {
makeCmm(20, 20, 10, 'murmur', 'buffers', function(cmm2, element) {
var cmm3 = cmm1.merge(cmm2);
expect(cmm3.width).to.equal(cmm1.width);
expect(cmm3.depth).to.equal(cmm1.depth);
expect(cmm3.total).to.equal(cmm1.total + cmm2.total);
expect(cmm3.hashType).to.equal(cmm1.hashType);
expect(cmm3.registers.length).to.equal(cmm1.registers.length);
expect(cmm3.registers).not.to.equal(cmm1.registers);
expect(cmm3.registers).not.to.equal(cmm2.registers);
expect(cmm3.frequency(element)).to.be.at.least(1);
expect(Math.abs(20 - cmm3.frequency(element))).to.be.at.most(expectedError(cmm3.total, cmm3.width));
done();
});
});
});
});
var totalError = 0;
var totalAcceptableError = 0;
var totalTests = 0;
describe('frequency', function() {
for (var i = 2; i < 24; i++) {
for (var j = 2; j < 24; j++) {
frequencyTest(i, j, i + j, 'strings');
frequencyTest(i, j, i + j, 'buffers');
}
}
it('should have acceptable average error rate', function() {
console.log('total error', totalError, 'total acceptable error', totalAcceptableError);
console.log('average error', totalError / totalTests);
expect(totalError).to.be.at.most(totalAcceptableError);
});
});
function makeCmm(width, depth, numElements, hashType, elementType, callback) {
var c = new CMM(width, depth, 42, hashType);
var rs = new Stream.Readable();
var size = 10 * width * depth;
var element = elementType === 'strings' ? '42' : new Buffer([0x42]);
var i = 0;
rs._read = function() {
var pushed = true;
var buf;
while (pushed && i < numElements) {
pushed = this.push(element);
i++;
}
while (pushed && i < size) {
buf = new Buffer(4);
buf.writeInt32LE(i++);
pushed = this.push(buf);
}
if (pushed && i === size) {
this.push(null);
}
};
c.on('finish', callback.bind(this, c, element));
rs.pipe(c);
return c;
}
function expectedError(total, width) {
return (2 * total) / width;
}
function frequencyTest(width, depth, numElements, elementType) {
it('should count about ' + numElements + ' ' + elementType + ' using w:' + width + ', d:' + depth, function(done) {
makeCmm(width, depth, numElements, 'whirlpool', elementType, function(c, element) {
var frequency = c.frequency(element);
//TODO is there any reliable bound on the error?
expect(frequency).to.be.a('number');
expect(frequency).to.be.at.least(1);
totalError += Math.abs(frequency - numElements);
totalAcceptableError += expectedError(c.total, width);
totalTests++;
done();
});
});
}
});