support {a:1,b:2}.should.include({a:1})

lib/chai/core/assertions.js

@@ -145,11 +145,16 @@ module.exports = function (chai, _) {
 
   function include (val, msg) {
     if (msg) flag(this, 'message', msg);
-    var obj = flag(this, 'object')
-    this.assert(
-        ~obj.indexOf(val)
-      , 'expected #{this} to include ' + _.inspect(val)
-      , 'expected #{this} to not include ' + _.inspect(val));
+    var obj = flag(this, 'object');
+
+    if (typeof val === 'object') {
+      for (var k in val) this.property(k, val[k]);
+    } else {
+      this.assert(
+          obj && ~obj.indexOf(val)
+        , 'expected #{this} to include ' + _.inspect(val)
+        , 'expected #{this} to not include ' + _.inspect(val));
+    }
   }
 
   Assertion.addChainableMethod('include', include, includeChainingBehavior);

lib/chai/interface/assert.js

@@ -657,19 +657,7 @@ module.exports = function (chai, util) {
    */
 
   assert.include = function (exp, inc, msg) {
-    var obj = new Assertion(exp, msg);
-
-    if (Array.isArray(exp)) {
-      obj.to.include(inc);
-    } else if ('string' === typeof exp) {
-      obj.to.contain.string(inc);
-    } else {
-      throw new chai.AssertionError(
-          'expected an array or string'
-        , null
-        , assert.include
-      );
-    }
+    new Assertion(exp, msg).include(inc);
   };
 
   /**
@@ -689,19 +677,7 @@ module.exports = function (chai, util) {
    */
 
   assert.notInclude = function (exp, inc, msg) {
-    var obj = new Assertion(exp, msg);
-
-    if (Array.isArray(exp)) {
-      obj.to.not.include(inc);
-    } else if ('string' === typeof exp) {
-      obj.to.not.contain.string(inc);
-    } else {
-      throw new chai.AssertionError(
-          'expected an array or string'
-        , null
-        , assert.notInclude
-      );
-    }
+    new Assertion(exp, msg).not.include(inc);
   };
 
   /**

test/assert.js

@@ -391,27 +391,25 @@ describe('assert', function () {
   it('include', function() {
     assert.include('foobar', 'bar');
     assert.include([ 1, 2, 3], 3);
+    assert.include({a:1, b:2}, {b:2});
 
     err(function () {
       assert.include('foobar', 'baz');
-    }, "expected \'foobar\' to contain \'baz\'");
+    }, "expected \'foobar\' to include \'baz\'");
 
     err(function () {
       assert.include(undefined, 'bar');
-    }, "expected an array or string");
+    }, "expected undefined to include 'bar'");
   });
 
   it('notInclude', function () {
     assert.notInclude('foobar', 'baz');
     assert.notInclude([ 1, 2, 3 ], 4);
+    assert.notInclude(undefined, 'bar');
 
     err(function () {
       assert.notInclude('foobar', 'bar');
-    }, "expected \'foobar\' to not contain \'bar\'");
-
-    err(function () {
-      assert.notInclude(undefined, 'bar');
-    }, "expected an array or string");
+    }, "expected \'foobar\' to not include \'bar\'");
   });
 
   it('lengthOf', function() {

test/expect.js

@@ -487,6 +487,8 @@ describe('expect', function () {
     expect([1,2]).to.include(1);
     expect(['foo', 'bar']).to.not.include('baz');
     expect(['foo', 'bar']).to.not.include(1);
+    expect({a:1,b:2}).to.include({b:2});
+    expect({a:1,b:2}).to.not.include({b:3});
 
     err(function(){
       expect(['foo']).to.include('bar', 'blah');
@@ -495,6 +497,10 @@ describe('expect', function () {
     err(function(){
       expect(['bar', 'foo']).to.not.include('foo', 'blah');
     }, "blah: expected [ 'bar', 'foo' ] to not include 'foo'");
+
+    err(function(){
+      expect({a:1}).to.include({b:2});
+    }, "expected { a: 1 } to have a property 'b'");
   });
 
   it('keys(array)', function(){

test/should.js

@@ -415,6 +415,8 @@ describe('should', function() {
     [1,2].should.include(1);
     ['foo', 'bar'].should.not.include('baz');
     ['foo', 'bar'].should.not.include(1);
+    ({a:1,b:2}).should.include({b:2});
+    ({a:1,b:2}).should.not.include({b:3});
 
     err(function(){
       ['foo'].should.include('bar', 'blah');
@@ -423,6 +425,10 @@ describe('should', function() {
     err(function(){
       ['bar', 'foo'].should.not.include('foo', 'blah');
     }, "blah: expected [ 'bar', 'foo' ] to not include 'foo'");
+
+    err(function(){
+      ({a:1}).should.include({b:2});
+    }, "expected { a: 1 } to have a property 'b'")
   });
 
   it('keys(array)', function(){