added estimateGas method

dist/web3-light.js

@@ -1970,6 +1970,14 @@ var call = new Method({
     inputFormatter: [formatters.inputTransactionFormatter, formatters.inputDefaultBlockNumberFormatter]
 });
 
+var estimateGas = new Method({
+    name: 'estimateGas',
+    call: 'eth_estimateGas',
+    params: 1,
+    inputFormatter: [formatters.inputTransactionFormatter],
+    outputFormatter: utils.toDecimal
+});
+
 var compileSolidity = new Method({
     name: 'compile.solidity',
     call: 'eth_compileSolidity',
@@ -2013,6 +2021,7 @@ var methods = [
     getTransactionFromBlock,
     getTransactionCount,
     call,
+    estimateGas,
     sendTransaction,
     compileSolidity,
     compileLLL,

dist/web3.js

@@ -1970,6 +1970,14 @@ var call = new Method({
     inputFormatter: [formatters.inputTransactionFormatter, formatters.inputDefaultBlockNumberFormatter]
 });
 
+var estimateGas = new Method({
+    name: 'estimateGas',
+    call: 'eth_estimateGas',
+    params: 1,
+    inputFormatter: [formatters.inputTransactionFormatter],
+    outputFormatter: utils.toDecimal
+});
+
 var compileSolidity = new Method({
     name: 'compile.solidity',
     call: 'eth_compileSolidity',
@@ -2013,6 +2021,7 @@ var methods = [
     getTransactionFromBlock,
     getTransactionCount,
     call,
+    estimateGas,
     sendTransaction,
     compileSolidity,
     compileLLL,

lib/web3/eth.js

@@ -174,6 +174,14 @@ var call = new Method({
     inputFormatter: [formatters.inputTransactionFormatter, formatters.inputDefaultBlockNumberFormatter]
 });
 
+var estimateGas = new Method({
+    name: 'estimateGas',
+    call: 'eth_estimateGas',
+    params: 1,
+    inputFormatter: [formatters.inputTransactionFormatter],
+    outputFormatter: utils.toDecimal
+});
+
 var compileSolidity = new Method({
     name: 'compile.solidity',
     call: 'eth_compileSolidity',
@@ -217,6 +225,7 @@ var methods = [
     getTransactionFromBlock,
     getTransactionCount,
     call,
+    estimateGas,
     sendTransaction,
     compileSolidity,
     compileLLL,

test/web3.eth.call.js

@@ -0,0 +1,41 @@
+var web3 = require('../index');
+var testMethod = require('./helpers/test.method.js');
+
+var method = 'call';
+
+var tests = [{
+    args: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: 11,
+        gasPrice: 11
+    }],
+    formattedArgs: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: '0xb',
+        gasPrice: '0xb'
+    }, 'latest'],
+    result: '0x31981',
+    formattedResult: '0x31981',
+    call: 'eth_'+ method
+},{
+    args: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: 11,
+        gasPrice: 11
+    }, 11],
+    formattedArgs: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: '0xb',
+        gasPrice: '0xb'
+    }, '0xb'],
+    result: '0x31981',
+    formattedResult: '0x31981',
+    call: 'eth_'+ method
+}];
+
+testMethod.runTests('eth', method, tests);
+

test/web3.eth.estimateGas.js

@@ -0,0 +1,25 @@
+var web3 = require('../index');
+var testMethod = require('./helpers/test.method.js');
+
+var method = 'estimateGas';
+
+var tests = [{
+    args: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: 11,
+        gasPrice: 11
+    }],
+    formattedArgs: [{
+        to: '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
+        data: '0x23455654',
+        gas: '0xb',
+        gasPrice: '0xb'
+    }],
+    result: '0x31981',
+    formattedResult: 203137,
+    call: 'eth_'+ method
+}];
+
+testMethod.runTests('eth', method, tests);
+