diff --git a/README.md b/README.md
index 30c20aa..8ef3ba5 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,14 @@ npm run-script build
 npm test
 ```
 
+### Testing (karma)
+Karma allows testing within one or several browser.
+
+```bash
+karma start --singleRun=true --browsers="Chrome,Firefox"
+```
+
+
 **Please note this repo is in it's early stage.**
 
 If you'd like to run a Http ethereum node check out
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..0ed5a15
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,96 @@
+// Karma configuration
+// Generated on Thu Feb 19 2015 19:57:47 GMT+0100 (W. Europe Standard Time)
+
+module.exports = function (config) {
+    config.set({
+
+        // base path that will be used to resolve all patterns (eg. files, exclude)
+        basePath: '',
+
+        // level of logging
+        // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+        
+        // Continuous Integration mode
+        // if true, Karma captures browsers, runs the tests and exits
+        singleRun: false,    logLevel: config.LOG_INFO,
+        //singleRun: true,    logLevel: config.LOG_DEBUG,
+
+        // frameworks to use
+        // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
+        frameworks: ['browserify', 'mocha'],
+
+
+        // list of files / patterns to load in the browser
+        files: [
+            'test/*.js',
+
+        ],
+
+
+        // list of files to exclude
+        exclude: [
+        ],
+
+        client: {
+            mocha: {
+                //ui: 'tdd'
+                timeout: 5000           // especially for the post requests
+            }
+        },
+        browserify: {
+            bundleDelay: 750,
+            debug: true
+                //     transform: [],
+                //     //extensions: ['.js']
+        },
+
+        // preprocess matching files before serving them to the browser
+        // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
+        preprocessors: {
+            'test/*.js': ['browserify']
+        },
+
+
+        // test results reporter to use
+        // possible values: 'dots', 'progress'
+        // available reporters: https://npmjs.org/browse/keyword/karma-reporter
+        reporters: ['dots'],
+
+
+        // web server port
+        port: 9876,
+
+
+        // enable / disable colors in the output (reporters and logs)
+        colors: true,
+
+
+        // enable / disable watching file and executing tests whenever any file changes
+        autoWatch: true,
+
+
+        // start these browsers
+        // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
+        // // Chrome
+        // // PhantomJS
+        browsers: ['Chrome', 'Safari', 'Firefox'],
+        browserNoActivityTimeout: 10000,
+        browserDisconnectTimeout: 5000,
+
+        customLaunchers: {
+            chromeWithoutSecurity: {
+                base: 'Chrome',
+                flags: ['--disable-web-security']
+            },
+
+            IE9: {
+                base: 'IE',
+                'x-ua-compatible': 'IE=EmulateIE9'
+            },
+            IE8: {
+                base: 'IE',
+                'x-ua-compatible': 'IE=EmulateIE8'
+            }
+        }
+    });
+};
diff --git a/lib/utils.js b/lib/utils.js
index f88e6ab..2ac02ea 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -108,7 +108,7 @@ var filterEvents = function (json) {
 /// TODO: add tests for it!
 var toEth = function (str) {
      /*jshint maxcomplexity:7 */
-    var val = typeof str === "string" ? str.indexOf('0x') === 0 ? parseInt(str.substr(2), 16) : parseInt(str) : str;
+    var val = typeof str === "string" ? str.indexOf('0x') === 0 ? parseInt(str.substr(2), 16) : parseInt(str.replace(/,/g,'').replace(/ /g,'')) : str;
     var unit = 0;
     var units = c.ETH_UNITS;
     while (val > 3000 && unit < units.length - 1)
diff --git a/package.json b/package.json
index 340200d..12355ec 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,12 @@
     "gulp-uglify": ">=1.0.0",
     "istanbul": "^0.3.5",
     "jshint": ">=2.5.0",
+    "karma": "^0.12.31",
+    "karma-browserify": "^4.0.0",
+    "karma-chrome-launcher": "^0.1.7",
+    "karma-firefox-launcher": "^0.1.4",
+    "karma-mocha": "^0.1.10",
+    "karma-safari-launcher": "^0.1.1",
     "mocha": ">=2.1.0",
     "mocha-lcov-reporter": "0.0.1",
     "unreachable-branch-transform": "^0.1.0",
diff --git a/test/utils.convert.js b/test/utils.convert.js
new file mode 100644
index 0000000..2287574
--- /dev/null
+++ b/test/utils.convert.js
@@ -0,0 +1,237 @@
+var assert = require('assert');
+var utils = require('../lib/utils.js');
+
+describe('utils', function() {
+
+    // given
+    // NOTE: I made the following tests pass as long as the values are mathematically correct.
+    // However, in the current state, there are inconsistancy regarding the trailing decimals.
+    // For instance '10 Mether' but '10.00 Gether'
+    var data = [{
+        test: 10e-9,
+        res: '0.00 wei'
+    }, {
+        test: 10e-6,
+        res: '0.00 wei'
+    }, {
+        test: 10e-3,
+        res: '0.01 wei'
+    }, {
+        test: '-10',
+        res: '-10 wei'
+    }, {
+        test: '0',
+        res: '0 wei'
+    }, {
+        test: 0,
+        res: '0 wei'
+    }, {
+        test: '1200000',
+        res: '1200 Kwei'
+    }, {
+        test: 1e3,
+        res: '1000 wei'
+    }, {
+        test: 10e3,
+        res: '10 Kwei'
+    }, {
+        test: 100e3,
+        res: '100 Kwei'
+    }, {
+        test: 1000e3,
+        res: '1000 Kwei'
+    }, {
+        test: 10e6,
+        res: '10 Mwei'
+    }, {
+        test: 100e6,
+        res: '100 Mwei'
+    }, {
+        test: 1000e6,
+        res: '1000 Mwei'
+    }, {
+        test: 10e9,
+        res: '10 Gwei'
+    }, {
+        test: 100e9,
+        res: '100 Gwei'
+    }, {
+        test: 1000e9,
+        res: '1000 Gwei'
+    }, {
+        test: 10e12,
+        res: '10 szabo'
+    }, {
+        test: 100e12,
+        res: '100 szabo'
+    }, {
+        test: 1000e12,
+        res: '1000 szabo'
+    }, {
+        test: 10e15,
+        res: '10 finney'
+    }, {
+        test: 100e15,
+        res: '100 finney'
+    }, {
+        test: 1000e15,
+        res: '1000 finney'
+    }, {
+        test: 10e18,
+        res: '10 ether'
+    }, {
+        test: 100e18,
+        res: '100 ether'
+    }, {
+        test: 1000e18,
+        res: '1000 ether'
+    }, {
+        test: 10e21,
+        res: '10 grand'
+    }, {
+        test: 100e21,
+        res: '100.00 grand'
+    }, {
+        test: 1000e21,
+        res: '1000 grand'
+    }, {
+        test: 10e24,
+        res: '10 Mether'
+    }, {
+        test: 100e24,
+        res: '100.00 Mether'
+    }, {
+        test: 1000e24,
+        res: '1000 Mether'
+    }, {
+        test: 10e27,
+        res: '10.00 Gether'
+    }, {
+        test: 100e27,
+        res: '100.00 Gether'
+    }, {
+        test: 1000e27,
+        res: '1000 Gether'
+    }, {
+        test: 10e30,
+        res: '10.00 Tether'
+    }, {
+        test: 100e30,
+        res: '100.00 Tether'
+    }, {
+        test: 1000e30,
+        res: '1,000.00 Tether'
+    }, {
+        test: 10e33,
+        res: '10.00 Pether'
+    }, {
+        test: 100e33,
+        res: '100.00 Pether'
+    }, {
+        test: 1000e33,
+        res: '1000 Pether'
+    }, {
+        test: 10e36,
+        res: '10.00 Eether'
+    }, {
+        test: 100e36,
+        res: '100.00 Eether'
+    }, {
+        test: 1000e36,
+        res: '1,000.00 Eether'
+    }, {
+        test: 10e39,
+        res: '10 Zether'
+    }, {
+        test: 100e39,
+        res: '100.00 Zether'
+    }, {
+        test: 1000e39,
+        res: '1000 Zether'
+    }, {
+        test: 10e42,
+        res: '10 Yether'
+    }, {
+        test: 100e42,
+        res: '100.00 Yether'
+    }, {
+        test: 1000e42,
+        res: '1,000.00 Yether'
+    }, {
+        test: 10e45,
+        res: '10 Nether'
+    }, {
+        test: 100e45,
+        res: '100.00 Nether'
+    }, {
+        test: 1000e45,
+        res: '1000 Nether'
+    }, {
+        test: 10e48,
+        res: '10 Dether'
+    }, {
+        test: 100e48,
+        res: '100.00 Dether'
+    }, {
+        test: 1000e48,
+        res: '1000 Dether'
+    }, {
+        test: 10e51,
+        res: '10 Vether'
+    }, {
+        test: 100e51,
+        res: '100.00 Vether'
+    }, {
+        test: 1000e51,
+        res: '1,000.00 Vether'
+    }, {
+        test: 10e54,
+        res: '10 Uether'
+    }, {
+        test: 10e57,
+        res: '10000 Uether'
+    }, {
+        test: 100e57,
+        res: '100,000.00 Uether'
+    }, {
+        test: 1000e57,
+        res: '1,000,000.00 Uether'
+    }, {
+        test: '10',
+        res: utils.toEth(10)
+    }, {
+        test: '100',
+        res: utils.toEth(100)
+    }, {
+        test: '1000',
+        res: utils.toEth(1000)
+    }, {
+        test: '1001',
+        res: utils.toEth(1001)
+    }, {
+        test: '999',
+        res: utils.toEth(999)
+    }, {
+        test: '10000000000000000000000',
+        res: utils.toEth(10e21) // 10 grand
+    }, {
+        test: '10 000',
+        res: '10 Kwei'
+    }, {
+        test: '10,000',
+        res: '10 Kwei'
+    }, {
+        test: '10,000.00',
+        res: '10 Kwei'
+    }];
+
+    data.forEach(function(elem) {
+        it('should convert ' + elem.test + ' into ' + elem.res, function() {
+            // when
+            var res = utils.toEth(elem.test);
+           
+            // then
+            assert.equal(res, elem.res);
+        });
+    });
+});