text: var chai = require('chai');
  var assert = chai.assert;
  var Web3 = require('../index');
  var web3 = new Web3();
  var FakeHttpProvider = require('./helpers/FakeHttpProvider');
  
  // use sendTransaction as dummy
  var method = 'sendTransaction';
  
  var tests = [{
      input: {
          'from': 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS',
          'to': 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'
      },
      formattedInput: {
          'from': '0x00c5496aee77c1ba1f0854206a26dda82a81d6d8',
          'to': '0x00c5496aee77c1ba1f0854206a26dda82a81d6d8'
      },
      result: '0xb',
      formattedResult: '0xb',
      call: 'eth_'+ method
  }];
  
  describe('async', function () {
      tests.forEach(function (test, index) {
          it('test: ' + index, function (done) {
              
              // given
              var provider = new FakeHttpProvider();
              web3.setProvider(provider);
              provider.injectResult(test.result);
              provider.injectValidation(function (payload) {
                  assert.equal(payload.jsonrpc, '2.0');
                  assert.equal(payload.method, test.call);
                  assert.deepEqual(payload.params, [test.formattedInput]);
              });
  
              // when 
              web3.eth[method](test.input, function(error, result){
  
                  // then
                  assert.isNull(error);
                  assert.strictEqual(test.formattedResult, result);
                  
                  done();
              });
              
          });
  
          it('error test: ' + index, function (done) {
              
              // given
              var provider = new FakeHttpProvider();
              web3.setProvider(provider);
              provider.injectError({
                      message: test.result,
                      code: -32603
              });
              provider.injectValidation(function (payload) {
                  assert.equal(payload.jsonrpc, '2.0');
                  assert.equal(payload.method, test.call);
                  assert.deepEqual(payload.params, [test.formattedInput]);
              });
  
              // when 
              web3.eth[method](test.input, function(error, result){
  
                  // then
                  assert.isUndefined(result);
                  assert.strictEqual(test.formattedResult, error.message);
  
                  done();
              });
              
          });
      });
  });
  
  