add new feature in children api

Now you can filter the childrens by a number, which would be equivalent to use the `at()` method.

`.children(0)` === `children().at(0)`;

update the children docs

remove comment

update the api

This commit undo the changes I've done to the `children` method, and created a new method named `childAt`.

update the docs

update docs and test description

update api and tests

update docs

docs/README.md

@@ -24,6 +24,7 @@
     * [is(selector)](/docs/api/ShallowWrapper/is.md)
     * [not(selector)](/docs/api/ShallowWrapper/not.md)
     * [children()](/docs/api/ShallowWrapper/children.md)
+    * [childAt()](/docs/api/ShallowWrapper/childAt.md)
     * [parents()](/docs/api/ShallowWrapper/parents.md)
     * [parent()](/docs/api/ShallowWrapper/parent.md)
     * [closest(selector)](/docs/api/ShallowWrapper/closest.md)
@@ -65,6 +66,7 @@
     * [is(selector)](/docs/api/ReactWrapper/is.md)
     * [not(selector)](/docs/api/ReactWrapper/not.md)
     * [children()](/docs/api/ReactWrapper/children.md)
+    * [childAt()](/docs/api/ReactWrapper/childAt.md)
     * [parents()](/docs/api/ReactWrapper/parents.md)
     * [parent()](/docs/api/ReactWrapper/parent.md)
     * [closest(selector)](/docs/api/ReactWrapper/closest.md)

docs/api/ReactWrapper/childAt.md

@@ -0,0 +1,28 @@
+# `.childAt(index) => ReactWrapper`
+
+Returns a new wrapper with child at the specified index.
+
+#### Arguments
+
+1. `index` (`number`): A zero-based integer indicating which node to retrieve.
+
+
+#### Returns
+
+`ReactWrapper`: A new wrapper that wraps the resulting node.
+
+
+
+#### Examples
+
+```jsx
+const wrapper = mount(<ToDoList items={items} />);
+expect(wrapper.find('ul').childAt(0).type()).to.equal('li');
+```
+
+#### Related Methods
+
+- [`.parents() => ReactWrapper`](parents.md)
+- [`.parent() => ReactWrapper`](parent.md)
+- [`.closest(selector) => ReactWrapper`](closest.md)
+- [`.children() => ReactWrapper`](children.md)

docs/api/ReactWrapper/children.md

@@ -1,6 +1,6 @@
 # `.children([selector]) => ReactWrapper`
 
-Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a 
+Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a
 selector can be provided and it will filter the children by this selector
 
 

docs/api/ShallowWrapper/childAt.md

@@ -0,0 +1,28 @@
+# `.childAt(index) => ShallowWrapper`
+
+Returns a new wrapper with child at the specified index.
+
+#### Arguments
+
+1. `index` (`number`): A zero-based integer indicating which node to retrieve.
+
+
+#### Returns
+
+`ShallowWrapper`: A new wrapper that wraps the resulting node.
+
+
+
+#### Examples
+
+```jsx
+const wrapper = shallow(<ToDoList items={items} />);
+expect(wrapper.find('ul').childAt(0).type()).to.equal('li');
+```
+
+#### Related Methods
+
+- [`.parents() => ShallowWrapper`](parents.md)
+- [`.parent() => ShallowWrapper`](parent.md)
+- [`.closest(selector) => ShallowWrapper`](closest.md)
+- [`.children() => ReactWrapper`](children.md)

docs/api/ShallowWrapper/children.md

@@ -1,6 +1,6 @@
 # `.children([selector]) => ShallowWrapper`
 
-Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a 
+Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a
 selector can be provided and it will filter the children by this selector
 
 

docs/api/mount.md

@@ -84,6 +84,9 @@ Remove nodes in the current wrapper that match the provided selector. (inverse o
 #### [`.children() => ReactWrapper`](ReactWrapper/children.md)
 Get a wrapper with all of the children nodes of the current wrapper.
 
+#### [`.childAt() => ReactWrapper`](ReactWrapper/childAt.md)
+Returns a new wrapper with child at the specified index.
+
 #### [`.parents() => ReactWrapper`](ReactWrapper/parents.md)
 Get a wrapper with all of the parents (ancestors) of the current node.
 

docs/api/shallow.md

@@ -85,6 +85,9 @@ Remove nodes in the current wrapper that match the provided selector. (inverse o
 #### [`.children() => ShallowWrapper`](ShallowWrapper/children.md)
 Get a wrapper with all of the children nodes of the current wrapper.
 
+#### [`.childAt() => ShallowWrapper`](ShallowWrapper/childAt.md)
+Returns a new wrapper with child at the specified index.
+
 #### [`.parents() => ShallowWrapper`](ShallowWrapper/parents.md)
 Get a wrapper with all of the parents (ancestors) of the current node.
 

src/ReactWrapper.js

@@ -439,6 +439,16 @@ export default class ReactWrapper {
     return selector ? allChildren.filter(selector) : allChildren;
   }
 
+  /**
+   * Returns a new wrapper with a specific child
+   *
+   * @param {Number} [index]
+   * @returns {ReactWrapper}
+   */
+  childAt(index) {
+    return this.single(() => this.children().at(index));
+  }
+
   /**
    * Returns a wrapper around all of the parents/ancestors of the wrapper. Does not include the node
    * in the current wrapper.

src/ShallowWrapper.js

@@ -407,6 +407,16 @@ export default class ShallowWrapper {
     return selector ? allChildren.filter(selector) : allChildren;
   }
 
+  /**
+   * Returns a new wrapper with a specific child
+   *
+   * @param {Number} [index]
+   * @returns {ShallowWrapper}
+   */
+  childAt(index) {
+    return this.single(() => this.children().at(index));
+  }
+
   /**
    * Returns a wrapper around all of the parents/ancestors of the wrapper. Does not include the node
    * in the current wrapper.

test/ReactWrapper-spec.js

@@ -1112,6 +1112,20 @@ describeWithDOM('mount', () => {
     });
   });
 
+  describe('.childAt(index)', () => {
+    it('should get a wrapped node at the specified index', () => {
+      const wrapper = mount(
+        <div>
+          <div className="bar" />
+          <div className="baz" />
+        </div>
+      );
+
+      expect(wrapper.childAt(0).hasClass('bar')).to.equal(true);
+      expect(wrapper.childAt(1).hasClass('baz')).to.equal(true);
+    });
+  });
+
   describe('.parents([selector])', () => {
     it('should return an array of current nodes ancestors', () => {
       const wrapper = mount(

test/ShallowWrapper-spec.js

@@ -1082,6 +1082,20 @@ describe('shallow', () => {
     });
   });
 
+  describe('.childAt(index)', () => {
+    it('should get a wrapped node at the specified index', () => {
+      const wrapper = shallow(
+        <div>
+          <div className="bar" />
+          <div className="baz" />
+        </div>
+      );
+
+      expect(wrapper.childAt(0).hasClass('bar')).to.equal(true);
+      expect(wrapper.childAt(1).hasClass('baz')).to.equal(true);
+    });
+  });
+
   describe('.parents([selector])', () => {
     it('should return an array of current nodes ancestors', () => {
       const wrapper = shallow(