get-random-values-polypony/test/createRandomSeed.js

Synchronous randombytes function that works in node, the browser & react-native!

const test=require("fresh-tape"),createRandomSeed=require("../createRandomSeed.js");function uintstr(uint8Array){const arr=[];for(let i=0;i<uint8Array.length;i++)arr[i]=uint8Array[i];const str=arr.join(",");return str}test("empty seeds do not work",function(t){t.throws(function(){return createRandomSeed()},"no seed"),t.throws(function(){return createRandomSeed(null)},"null seed"),t.throws(function(){return createRandomSeed(void 0)},"undefined seed"),t.throws(function(){return createRandomSeed("")},"\"\" seed"),t.throws(function(){return createRandomSeed([])},"[] seed"),t.throws(function(){return createRandomSeed(0)},"0 seed"),t.end()}),test("floating points as seed data",function(t){const rng=createRandomSeed(.5);t.equals(uintstr(rng(new Uint8Array(2))),"98,156"),t.end()}),test("Complex random seed",function(t){const rng=createRandomSeed([.5,"hello",[1,{low:1,high:2},"world"],1]);t.equals(uintstr(rng(new Uint8Array(6))),"227,56,24,50,65,169"),t.end()}),test("two same seeds mean two same results",function(t){const rngA=createRandomSeed("a"),rngB=createRandomSeed("a"),dataA=rngA(new Uint8Array(10)),dataB=rngB(new Uint8Array(10));t.equals(uintstr(dataA),uintstr(dataB),"random(\"a\") === random(\"a\")"),t.end()}),test("two different seeds mean two different results",function(t){const rngA=createRandomSeed("a"),rngB=createRandomSeed("b"),dataA=rngA(new Uint8Array(10)),dataB=rngB(new Uint8Array(10));t.notEquals(uintstr(dataA),uintstr(dataB),"random(\"a\") != random(\"b\")"),t.end()}),test("missing properties in arrays get ignored",function(t){const rngA=createRandomSeed("a"),rngB=createRandomSeed(["a",null]),dataA=rngA(new Uint8Array(10)),dataB=rngB(new Uint8Array(10));t.equals(uintstr(dataA),uintstr(dataB),"random(\"a\") == random([\"a\", null])"),t.end()}),test("increasing entropy should return different results",function(t){const rngA=createRandomSeed("a"),rngB=createRandomSeed("a");rngA.increaseEntropy("b");const dataA=rngA(new Uint8Array(10)),dataB=rngB(new Uint8Array(10));t.notEquals(uintstr(dataA),uintstr(dataB),"random(\"a\") != increase(random(\"a\"), \"b\")"),t.end()}),test("different types",function(t){const run=function(name,bufferView){const rngBufferView=createRandomSeed("a");rngBufferView(bufferView);const uint8=new Uint8Array(bufferView.buffer),rngUint8=createRandomSeed("a");rngUint8(uint8),t.equals(uintstr(new Uint8Array(bufferView.buffer)),uintstr(uint8),name+" works same as Uint8Array")};run("Int8Array",new Int8Array(32)),run("Uint8Array",new Uint8Array(32)),run("Uint16Array",new Uint16Array(32)),run("Uint32Array",new Uint32Array(32)),run("Int16Array",new Int16Array(32)),run("Int32Array",new Int32Array(32)),run("Float32Array",new Float32Array(32)),run("Float64Array",new Float64Array(32)),run("DataView",new DataView(new ArrayBuffer(32))),t.end()});