Update contract class to not mutate options object

CHANGELOG.md

@@ -593,3 +593,4 @@ Released with 1.0.0-beta.37 code base.
 ### Fixed
 -  Browser builds support polyfills (#5031) (#5053) (#4659) (#4767)
 -  Start incrementing jsonrpc.id from random number (#5327)
+-  `web3-eth-contract`'s `call` and `send` methods no longer mutate `options` argument (#5394)

packages/web3-eth-contract/src/index.js

@@ -379,19 +379,20 @@ Contract.prototype._checkListener = function(type, event){
  * @return {Object} the options with gaps filled by defaults
  */
 Contract.prototype._getOrSetDefaultOptions = function getOrSetDefaultOptions(options) {
-    var gasPrice = options.gasPrice ? String(options.gasPrice): null;
-    var from = options.from ? utils.toChecksumAddress(formatters.inputAddressFormatter(options.from)) : null;
+    var _options = { ...options };
+    var gasPrice = _options.gasPrice ? String(_options.gasPrice): null;
+    var from = _options.from ? utils.toChecksumAddress(formatters.inputAddressFormatter(_options.from)) : null;
 
-    options.data = options.data || this.options.data;
+    _options.data = _options.data || this.options.data;
 
-    options.from = from || this.options.from;
-    options.gasPrice = gasPrice || this.options.gasPrice;
-    options.gas = options.gas || options.gasLimit || this.options.gas;
+    _options.from = from || this.options.from;
+    _options.gasPrice = gasPrice || this.options.gasPrice;
+    _options.gas = _options.gas || _options.gasLimit || this.options.gas;
 
     // TODO replace with only gasLimit?
-    delete options.gasLimit;
+    delete _options.gasLimit;
 
-    return options;
+    return _options;
 };
 
 

test/contract.js

@@ -3152,6 +3152,77 @@ var runTests = function(contractFactory) {
 describe('typical usage', function() {
     runTests(getEthContractInstance);
 
+    it('should not mutate options object - call', function (done) {
+        var provider = new FakeHttpProvider();
+
+        provider.injectResult('0x0000000000000000000000000000000000000000000000000000000000000032');
+
+        var eth = new Eth(provider);
+        var contract = new eth.Contract(abi, address);
+        var options = { from: address };
+        var expectedOptions = { ...options };
+
+        contract.methods.balance(address).call(options)
+        .then(function () {
+            assert.deepEqual(options, expectedOptions);
+            done();
+        });
+    });
+
+    it('should not mutate options object - send', function (done) {
+        var provider = new FakeHttpProvider();
+
+        provider.injectResult('0x1234000000000000000000000000000000000000000000000000000000056789');
+        provider.injectResult({
+            contractAddress: null,
+            cumulativeGasUsed: '0xa',
+            transactionIndex: '0x3',
+            transactionHash: '0x1234',
+            blockNumber: '0xa',
+            blockHash: '0x1234',
+            gasUsed: '0x0',
+            logs: [{
+                address: address,
+                topics: [
+                    sha3('Unchanged(uint256,address,uint256)'),
+                    '0x0000000000000000000000000000000000000000000000000000000000000002',
+                    '0x000000000000000000000000'+ addressLowercase.replace('0x','')
+                ],
+                blockNumber: '0xa',
+                transactionHash: '0x1234',
+                transactionIndex: '0x0',
+                blockHash: '0x1345',
+                logIndex: '0x4',
+                data: '0x0000000000000000000000000000000000000000000000000000000000000005'
+            },{
+                address: address,
+                topics: [
+                    sha3('Changed(address,uint256,uint256,uint256)'),
+                    '0x000000000000000000000000'+ addressLowercase.replace('0x',''),
+                    '0x0000000000000000000000000000000000000000000000000000000000000001'
+                ],
+                blockNumber: '0xa',
+                transactionHash: '0x1234',
+                transactionIndex: '0x0',
+                blockHash: '0x1345',
+                logIndex: '0x4',
+                data: '0x0000000000000000000000000000000000000000000000000000000000000001' +
+                '0000000000000000000000000000000000000000000000000000000000000008'
+            }]
+        });
+
+        var eth = new Eth(provider);
+        var contract = new eth.Contract(abi, address);
+        var options = { from: address, gasPrice: '21345678654321' };
+        var expectedOptions = { ...options };
+
+        contract.methods.mySend(address, 10).send(options)
+        .on('receipt', function () {
+            assert.deepEqual(options, expectedOptions);
+            done();
+        });
+    });
+
     it('should update contract instance provider when assigned a provider to eth instance that contract instance came from', function () {
         var provider1 = new FakeIpcProvider();
         var provider2 = new FakeHttpProvider();