Add staking fuzz tests. Run semi random inputs to staking contract. Validate result as expected. (#963)

* Added staking fuzz tests

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Fix comments in stakingActionsGenerator.js

Fix contract name

Fix some stuff from Mike's CR

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Add revert msgs

Modify random generation, console log validity states, complete withdrawal checks

Move random number generation to helper file, return if check fails

Remove console.log

* Minor fixes

* Add CRLF

* Use winston for logging into file

* Round progress percentage

Author: Anyhowclick

package-lock.json

@@ -34,6 +34,7 @@
     "truffle-flattener": "1.4.2",
     "web3": "1.2.4",
     "web3-utils": "1.2.4",
+    "winston": "^3.3.3",
     "yargs": "11.1.1"
   },
   "devDependencies": {

package.json

@@ -0,0 +1,11 @@
+const BN = web3.utils.BN;
+module.exports.genRandomSeed = genRandomSeed;
+function genRandomSeed(base) {
+    return Math.floor(Math.random() * Math.random() * base) % base;
+}
+
+module.exports.genRandomBN = function(minBN, maxBN) {
+    let seed = new BN(genRandomSeed(1000000000000000));
+    // normalise seed
+    return (maxBN.sub(minBN).mul(seed).div(new BN(1000000000000000))).add(minBN);
+}