Deleted transactionMined (unused). (#1527)

test/helpers/transactionMined.js

-// From https://gist.github.com/xavierlepretre/88682e871f4ad07be4534ae560692ee6
-function transactionMined (txnHash, interval) {
-  interval = interval || 500;
-  const transactionReceiptAsync = function (txnHash, resolve, reject) {
-    try {
-      const receipt = web3.eth.getTransactionReceipt(txnHash);
-      if (receipt === null) {
-        setTimeout(function () {
-          transactionReceiptAsync(txnHash, resolve, reject);
-        }, interval);
-      } else {
-        resolve(receipt);
-      }
-    } catch (e) {
-      reject(e);
-    }
-  };
-
-  if (Array.isArray(txnHash)) {
-    return Promise.all(txnHash.map(hash =>
-      web3.eth.getTransactionReceiptMined(hash, interval)
-    ));
-  } else {
-    return new Promise(function (resolve, reject) {
-      transactionReceiptAsync(txnHash, resolve, reject);
-    });
-  }
-}
-
-web3.eth.transactionMined = transactionMined;
-
-module.exports = {
-  transactionMined,
-};