diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..ed9f9cc
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1 @@
+coverage
\ No newline at end of file
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..f433881
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,26 @@
+{
+  "rules": {
+    "quotes": [2, "single"],
+    "strict": [2, "never"],
+    "eol-last": 0,
+    "no-use-before-define": 0,
+    "new-cap": [0, {"capIsNew": false}],
+    "no-unused-vars": [2, {"args": "none"}],
+    "no-alert": 0,
+    "no-shadow": 0,
+    "object-shorthand": 0,
+    "no-underscore-dangle": 0,
+    "curly": 0,
+    "no-empty": 0,
+    "no-unused-expressions": 0
+  },
+  "env": {
+    "browser": true,
+    "node": true,
+    "mocha": true,
+    "es6": true
+  },
+  "globals": {
+    "expect": true
+  }
+}
\ No newline at end of file
diff --git a/.jscsrc b/.jscsrc
new file mode 100644
index 0000000..5b58298
--- /dev/null
+++ b/.jscsrc
@@ -0,0 +1,7 @@
+{
+  "disallowEmptyBlocks": true,
+  "validateIndentation": "\t",
+  "excludeFiles": [
+    "coverage/**"
+  ]
+}
\ No newline at end of file
diff --git a/.jshintignore b/.jshintignore
deleted file mode 100644
index 3091757..0000000
--- a/.jshintignore
+++ /dev/null
@@ -1,2 +0,0 @@
-node_modules
-coverage
\ No newline at end of file
diff --git a/.jshintrc b/.jshintrc
deleted file mode 100644
index 6cb4a49..0000000
--- a/.jshintrc
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-	"asi" : false,
-	"bitwise" : true,
-	"boss" : false,
-	"curly" : true,
-	"debug": false,
-	"devel": false,
-	"eqeqeq": true,
-	"evil": false,
-	"expr": true,
-	"forin": false,
-	"immed": true,
-	"latedef" : false,
-	"laxbreak": false,
-	"multistr": true,
-	"newcap": true,
-	"noarg": true,
-	"node" : true,
-	"noempty": false,
-	"nonew": true,
-	"onevar": false,
-	"plusplus": false,
-	"strict": false,
-	"sub": false,
-	"trailing" : true,
-	"undef": true,
-	"unused": "vars",
-	"browser": true
-}
diff --git a/README.md b/README.md
index 6cda1fc..a1579e5 100644
--- a/README.md
+++ b/README.md
@@ -72,3 +72,7 @@ to contain subset
 */
 ```
 
+and with asset interface
+```js
+assert.containSubset({a: 1, b: 2}, {a: 1});
+```
diff --git a/lib/chai-subset.js b/lib/chai-subset.js
index ef75b55..ddd8403 100644
--- a/lib/chai-subset.js
+++ b/lib/chai-subset.js
@@ -2,7 +2,7 @@ module.exports = function(chai, utils) {
 	var Assertion = chai.Assertion;
 	var assertionPrototype = Assertion.prototype;
 
-	Assertion.addChainableMethod('containSubset', function (expected) {
+	Assertion.addMethod('containSubset', function (expected) {
 		var actual = utils.flag(this, 'object');
 		var showDiff = chai.config.showDiff;
 
@@ -15,6 +15,10 @@ module.exports = function(chai, utils) {
 			showDiff
 		);
 	});
+
+	chai.assert.containSubset = function(val, exp, msg) {
+		new chai.Assertion(val, msg).to.be.containSubset(exp);
+	};
 };
 
 function compare(expected, actual) {
diff --git a/package.json b/package.json
index 0ec9ed0..a6af1cb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chai-subset",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "description": "Object properties matcher for Chai",
   "main": "lib/chai-subset.js",
   "scripts": {
@@ -27,10 +27,12 @@
   },
   "homepage": "https://github.com/debitoor/chai-subset",
   "devDependencies": {
-    "chai": "^2.1.2",
+    "chai": "^3.2.0",
     "coveralls": "^2.11.3",
     "istanbul": "^0.3.17",
+    "jscs": "^1.13.1",
     "mocha": "^2.2.1",
-    "mocha-jshint": "^2.0.2"
+    "mocha-eslint": "^1.0.0",
+    "mocha-jscs": "^1.2.0"
   }
 }
diff --git a/test/common.js b/test/common.js
index dbceaba..9f14210 100644
--- a/test/common.js
+++ b/test/common.js
@@ -1,4 +1,4 @@
 var chai = require('chai');
-var chaiSubset = require("../lib/chai-subset");
+var chaiSubset = require('../lib/chai-subset');
 global.expect = chai.expect;
 chai.use(chaiSubset);
\ No newline at end of file
diff --git a/test/eslint.spec.js b/test/eslint.spec.js
new file mode 100644
index 0000000..75761bf
--- /dev/null
+++ b/test/eslint.spec.js
@@ -0,0 +1 @@
+require('mocha-eslint')(['lib', 'test']);
\ No newline at end of file
diff --git a/test/jscs.spec.js b/test/jscs.spec.js
new file mode 100644
index 0000000..fe580c8
--- /dev/null
+++ b/test/jscs.spec.js
@@ -0,0 +1 @@
+require('mocha-jscs')(['lib', 'test']);
\ No newline at end of file
diff --git a/test/jshint.spec.js b/test/jshint.spec.js
deleted file mode 100644
index 5cb07d7..0000000
--- a/test/jshint.spec.js
+++ /dev/null
@@ -1 +0,0 @@
-require('mocha-jshint')();
\ No newline at end of file
diff --git a/test/unit/chai-subset.spec.js b/test/unit/chai-subset.spec.js
index 36453fd..9fa6114 100644
--- a/test/unit/chai-subset.spec.js
+++ b/test/unit/chai-subset.spec.js
@@ -118,4 +118,11 @@ describe('circular objects', function() {
 			]
 		});
 	});
+});
+
+describe('assert style of test', function () {
+	it('should find subset', function () {
+		var assert = require('chai').assert;
+		assert.containSubset({a: 1, b: 2}, {a: 1});
+	});
 });
\ No newline at end of file