Added notContainSubset option to assert

README.md

@@ -1,65 +1,65 @@
-chai-subset [![npm version](https://badge.fury.io/js/chai-subset.svg)](https://badge.fury.io/js/chai-subset) [![Build Status](https://travis-ci.org/debitoor/chai-subset.svg?branch=master)](https://travis-ci.org/debitoor/chai-subset) [![devDependency Status](https://david-dm.org/debitoor/chai-subset/dev-status.svg)](https://david-dm.org/debitoor/chai-subset#info=devDependencies) [![Coverage Status](https://coveralls.io/repos/debitoor/chai-subset/badge.svg?service=github)](https://coveralls.io/github/debitoor/chai-subset) [![NSP Status](https://nodesecurity.io/orgs/debitoor/projects/eb6fec04-2b26-4462-b4ff-08d952da3065/badge)](https://nodesecurity.io/orgs/debitoor/projects/eb6fec04-2b26-4462-b4ff-08d952da3065)
-===========
+# chai-subset [![npm version](https://badge.fury.io/js/chai-subset.svg)](https://badge.fury.io/js/chai-subset) [![Build Status](https://travis-ci.org/debitoor/chai-subset.svg?branch=master)](https://travis-ci.org/debitoor/chai-subset) [![devDependency Status](https://david-dm.org/debitoor/chai-subset/dev-status.svg)](https://david-dm.org/debitoor/chai-subset#info=devDependencies) [![Coverage Status](https://coveralls.io/repos/debitoor/chai-subset/badge.svg?service=github)](https://coveralls.io/github/debitoor/chai-subset) [![NSP Status](https://nodesecurity.io/orgs/debitoor/projects/eb6fec04-2b26-4462-b4ff-08d952da3065/badge)](https://nodesecurity.io/orgs/debitoor/projects/eb6fec04-2b26-4462-b4ff-08d952da3065)
 
 "containSubset" object properties matcher for [Chai](http://chaijs.com/) assertion library
 
-Installation
-===========
+# Installation
 
 `npm install --save-dev chai-subset`
 
-Usage
-=====
+# Usage
 
 common.js
+
 ```js
-var chai = require('chai');
-var chaiSubset = require('chai-subset');
+var chai = require("chai");
+var chaiSubset = require("chai-subset");
 chai.use(chaiSubset);
 ```
 
 in your spec.js
+
 ```js
 var obj = {
-	a: 'b',
-	c: 'd',
-	e: {
-		foo: 'bar',
-		baz: {
-			qux: 'quux'
-		}
-	}
+  a: "b",
+  c: "d",
+  e: {
+    foo: "bar",
+    baz: {
+      qux: "quux"
+    }
+  }
 };
-	
+
 expect(obj).to.containSubset({
-	a: 'b',
-	e: {
-		baz: {
-			qux: 'quux'
-		}
-	}
+  a: "b",
+  e: {
+    baz: {
+      qux: "quux"
+    }
+  }
 });
 
 // or using a compare function
 expect(obj).containSubset({
-	a: (expectedValue) => expectedValue,
-	c: (expectedValue) => expectedValue === 'd'
-})
+  a: expectedValue => expectedValue,
+  c: expectedValue => expectedValue === "d"
+});
 
 // or with 'not'
 expect(obj).to.not.containSubset({
-	g: 'whatever'
+  g: "whatever"
 });
 ```
 
 Also works good with arrays and `should` interface
+
 ```js
-var list = [{a: 'a', b: 'b'}, {v: 'f', d: {z: 'g'}}];
+var list = [{ a: "a", b: "b" }, { v: "f", d: { z: "g" } }];
 
-list.should.containSubset([{a:'a'}]); //Assertion error is not thrown
-list.should.containSubset([{a:'a',  b: 'b'}]); //Assertion error is not thrown
+list.should.containSubset([{ a: "a" }]); //Assertion error is not thrown
+list.should.containSubset([{ a: "a", b: "b" }]); //Assertion error is not thrown
 
-list.should.containSubset([{a:'a', b: 'bd'}]); 
+list.should.containSubset([{ a: "a", b: "bd" }]);
 /*throws
 AssertionError: expected
 [
@@ -80,6 +80,8 @@ to contain subset
 ```
 
 and with `assert` interface
+
 ```js
-assert.containSubset({a: 1, b: 2}, {a: 1});
+assert.containSubset({ a: 1, b: 2 }, { a: 1 });
+assert.notContainSubset({ a: 1, b: 2 }, { a: 3 });
 ```

lib/chai-subset.js

@@ -31,6 +31,10 @@
 			new chai.Assertion(val, msg).to.be.containSubset(exp);
 		};
 
+		chai.assert.notContainSubset = function(val, exp, msg) {
+			new chai.Assertion(val, msg).not.to.be.containSubset(exp);
+		};
+
 		function compare(expected, actual) {
 			if (expected === actual) {
 				return true;