Miswrote in keys documentation, corrected mistake

lib/chai/core/assertions.js

@@ -968,16 +968,16 @@ module.exports = function (chai, _) {
  * in must exist in the target object. Use without the `any` or `all` 
  * qualifiers is deprecated and will default to `all`. 
  * 
- * Finally, use of `contains` in conjunction with `all` requires that
- * the number of passed-in keys match the total number of keys in the target
- * object.
+ * Finally, use of the `all` qualifier in general requires that the number of
+ * keys passed in must match the number of keys in the target object unless
+ * the contains qualifier is also used.
  * 
  * expect({ foo: 1, bar: 2 }).to.have.any.keys('foo', 'baz');
  * expect({ foo: 1, bar: 2 }).to.have.any.keys('foo');
  * expect({ foo: 1, bar: 2 }).to.contain.any.keys('bar', 'baz');
  * expect({ foo: 1, bar: 2 }).to.contain.any.keys(['foo']);
  * expect({ foo: 1, bar: 2 }).to.have.all.keys(['bar', 'foo']);
- * expect({ foo: 1, bar: 2 }).to.contain.all.keys(['bar', 'foo']);
+ * expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys(['bar', 'foo']);
  *
  * @name keys
  * @alias key

test/expect.js

@@ -535,6 +535,7 @@ describe('expect', function () {
  expect({ foo: 1, bar: 2 }).to.contain.keys(['foo']);
  expect({ foo: 1, bar: 2 }).to.contain.keys(['bar']);
  expect({ foo: 1, bar: 2 }).to.contain.keys(['bar', 'foo']);
+ expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys(['bar', 'foo']);
 
  expect({ foo: 1, bar: 2 }).to.not.have.keys('baz');
  expect({ foo: 1, bar: 2 }).to.not.have.keys('foo', 'baz');
@@ -594,6 +595,10 @@ describe('expect', function () {
  err(function(){
  expect({ foo: 1, bar: 2 }).to.not.have.keys(['foo', 'bar']);
  }, "expected { foo: 1, bar: 2 } to not have keys 'foo', and 'bar'");
+
+ err(function(){
+ expect({ foo: 1, bar: 2 }).to.have.all.keys('foo');
+ }, "expected { foo: 1, bar: 2 } to have key 'foo'");
 
  err(function(){
  expect({ foo: 1 }).to.not.contain.keys(['foo']);