# See the Number of Todos To Be Completed

## *Story: As a user, I want to see how many remaining todos I have to complete.*

## Footer component

### Should render correctly

#### It should be a Footer component

Write the test.

```javascript
// tests/todomvc/components/Footer.spec.js

'use strict';

import React from 'react'
import {expect} from 'chai'
import {shallow} from 'enzyme'

import Footer from '../../../src/todomvc/components/Footer'

function setup() {
  const component = shallow(
    <Footer/>
  );

  return {
    component: component
  }
}

describe('Footer component', () => {
  describe('Should render correctly', () => {
    it('Should be a Footer', () => {
      const {component} = setup();

      expect(component.type()).to.equal('footer')
    })
  })
});
```

Run the test and watch it fail.

```bash
module.js:487
    throw err;
    ^

Error: Cannot find module '../../../src/todomvc/components/Footer'
```

Write the code to make the test pass.

```javascript
// src/todomvc/components/Footer.js

'use strict';

import React, {Component} from 'react'

export default class Footer extends Component {
  render() {
    return (
      <footer/>
    )
  }
}
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  39 passing (112ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m 'Footer component'
```

#### It should have a todo counter

Write the test.

```javascript
diff --git a/tests/todomvc/components/Footer.spec.js b/tests/todomvc/components/Footer.spec.js
index f67c62d..869200a 100644
--- a/tests/todomvc/components/Footer.spec.js
+++ b/tests/todomvc/components/Footer.spec.js
@@ -6,9 +6,13 @@ import {shallow} from 'enzyme'

 import Footer from '../../../src/todomvc/components/Footer'

-function setup() {
+function setup(todos) {
+  const props = {
+    todos: todos
+  };
+
   const component = shallow(
-    <Footer/>
+    <Footer {...props} />
   );

   return {
@@ -22,6 +26,14 @@ describe('Footer component', () => {
       const {component} = setup();

       expect(component.type()).to.equal('footer')
+    });
+
+    it('Should have a todo counter', () => {
+      const {component} = setup();
+      const label = component.children('label');
+
+      expect(label.type()).to.equal('label');
+      expect(label.text()).to.equal('The number of todos not completed: ')
     })
   })
 });
(END)
```

Run the test and watch it fail.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      1) Should have a todo counter

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  39 passing (110ms)
  1 failing

  1) Footer component Should render correctly Should have a todo counter:
     Error: Method “type” is only meant to be run on a single node. 0 found instead.
      at ShallowWrapper.single (node_modules/enzyme/build/ShallowWrapper.js:1516:17)
      at ShallowWrapper.type (node_modules/enzyme/build/ShallowWrapper.js:1110:21)
      at Context.<anonymous> (tests/todomvc/components/Footer.spec.js:31:20)
```

Write the code to make the test pass.

```javascript
diff --git a/src/todomvc/components/Footer.js b/src/todomvc/components/Footer.js
index 8e5c5dd..43e0234 100644
--- a/src/todomvc/components/Footer.js
+++ b/src/todomvc/components/Footer.js
@@ -3,9 +3,16 @@
 import React, {Component} from 'react'

 export default class Footer extends Component {
+
+  static countNotCompleted(todos) {
+    if (typeof todos === "undefined") return ''
+  }
+
   render() {
     return (
-      <footer/>
+      <footer>
+        <label>The number of todos not completed: {Footer.countNotCompleted()}</label>
+      </footer>
     )
   }
 }
(END)
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  40 passing (102ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m 'have a todo counter'
```

### Should behave correctly

#### It should display 'No todos left' when active count is 0

Write the test.

```javascript
diff --git a/tests/todomvc/components/Footer.spec.js b/tests/todomvc/components/Footer.spec.js
index 869200a..78d81ae 100644
--- a/tests/todomvc/components/Footer.spec.js
+++ b/tests/todomvc/components/Footer.spec.js
@@ -1,6 +1,7 @@
 'use strict';

 import React from 'react'
+import {List} from 'immutable'
 import {expect} from 'chai'
 import {shallow} from 'enzyme'

@@ -34,6 +35,14 @@ describe('Footer component', () => {

       expect(label.type()).to.equal('label');
       expect(label.text()).to.equal('The number of todos not completed: ')
+    });
+
+    it('Should display \'No todos left\' when active count is 0', () => {
+      const {component} = setup(List([]));
+      const label = component.children('label');
+
+      expect(label.type()).to.equal('label');
+      expect(label.text()).to.equal('The number of todos not completed: No todos left')
     })
   })
 });
(END)
```

Run the test and watch it fail.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      1) Should display 'No todos left' when active count is 0

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  40 passing (106ms)
  1 failing

  1) Footer component Should render correctly Should display 'No todos left' when active count is 0:

      AssertionError: expected 'The number of todos not completed: ' to equal 'The number of todos not completed: No todos left'
      + expected - actual

      -The number of todos not completed: 
      +The number of todos not completed: No todos left

      at Context.<anonymous> (tests/todomvc/components/Footer.spec.js:45:31)
```

Write the code to make the test pass.

```javascript
diff --git a/src/todomvc/components/Footer.js b/src/todomvc/components/Footer.js
index 43e0234..61bf598 100644
--- a/src/todomvc/components/Footer.js
+++ b/src/todomvc/components/Footer.js
@@ -1,17 +1,24 @@
 'use strict';

 import React, {Component} from 'react'
+import PropTypes from 'prop-types'

 export default class Footer extends Component {
+  static propTypes = {
+    todos: PropTypes.object
+  };

   static countNotCompleted(todos) {
-    if (typeof todos === "undefined") return ''
+    if (typeof todos === "undefined") return '';
+    else if (todos.filter(todo => todo.get('completed') !== true).count() === 0) return 'No todos left'
   }

   render() {
+    const {todos} = this.props;
+
     return (
       <footer>
-        <label>The number of todos not completed: {Footer.countNotCompleted()}</label>
+        <label>The number of todos not completed: {Footer.countNotCompleted(todos)}</label>
       </footer>
     )
   }
(END)
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  41 passing (98ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m "display 'No todos left' when active count is 0"
```

#### It should display '1 todo left' when active count is 1

Write the test.

```javascript
diff --git a/tests/todomvc/components/Footer.spec.js b/tests/todomvc/components/Footer.spec.js
index 78d81ae..e644a37 100644
--- a/tests/todomvc/components/Footer.spec.js
+++ b/tests/todomvc/components/Footer.spec.js
@@ -1,7 +1,8 @@
 'use strict';

 import React from 'react'
-import {List} from 'immutable'
+import {List, Map} from 'immutable'
+import uuid from 'uuid'
 import {expect} from 'chai'
 import {shallow} from 'enzyme'

@@ -43,6 +44,15 @@ describe('Footer component', () => {

       expect(label.type()).to.equal('label');
       expect(label.text()).to.equal('The number of todos not completed: No todos left')
+    });
+
+    it('Should display \'1 todo left\' when active count is 1', () => {
+      const todos = List([Map({id: uuid.v4(), description: 'todo 1', completed: false})]);
+      const {component} = setup(todos);
+      const label = component.children('label');
+
+      expect(label.type()).to.equal('label');
+      expect(label.text()).to.equal('The number of todos not completed: 1 todo left')
     })
   })
 });
(END)
```

Run the test and watch it fail.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      1) Should display '1 todo left' when active count is 1

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  41 passing (107ms)
  1 failing

  1) Footer component Should render correctly Should display '1 todo left' when active count is 1:

      AssertionError: expected 'The number of todos not completed: ' to equal 'The number of todos not completed: 1 todo left'
      + expected - actual

      -The number of todos not completed: 
      +The number of todos not completed: 1 todo left

      at Context.<anonymous> (tests/todomvc/components/Footer.spec.js:55:31)
```

Write the code to make the test pass.

```javascript
diff --git a/src/todomvc/components/Footer.js b/src/todomvc/components/Footer.js
index d19e5c2..7a4587d 100644
--- a/src/todomvc/components/Footer.js
+++ b/src/todomvc/components/Footer.js
@@ -11,6 +11,7 @@ export default class Footer extends Component {
   static countNotCompleted(todos) {
     if (typeof todos === "undefined") return ''
-    else if (todos.filter(todo => todo.get('completed') !== true).count() === 0) return 'No todos left'
+    else if (todos.filter(todo => todo.get('completed') !== true).count() === 0) return 'No todos left';
+    else if (todos.filter(todo => todo.get('completed') !== true).count() === 1) return '1 todo left'
   }

   render() {
(END)
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      ✓ Should display '1 todo left' when active count is 1

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  42 passing (107ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m "display '1 todo left' when active count is 1"
```

#### It should display '5 todos left' when active count is 5

Five is used randomly here. It can be any other integer greater than one.

Write the test.

```javascript
diff --git a/tests/todomvc/components/Footer.spec.js b/tests/todomvc/components/Footer.spec.js
index e644a37..5ab9f94 100644
--- a/tests/todomvc/components/Footer.spec.js
+++ b/tests/todomvc/components/Footer.spec.js
@@ -53,6 +53,21 @@ describe('Footer component', () => {

       expect(label.type()).to.equal('label');
       expect(label.text()).to.equal('The number of todos not completed: 1 todo left')
+    });
+
+    it('Should display \'5 todos left\' when active count is 5', () => {
+      const todos = List([
+        Map({id: uuid.v4(), description: 'todo 1', completed: false}),
+        Map({id: uuid.v4(), description: 'todo 2', completed: false}),
+        Map({id: uuid.v4(), description: 'todo 3', completed: false}),
+        Map({id: uuid.v4(), description: 'todo 4', completed: false}),
+        Map({id: uuid.v4(), description: 'todo 5', completed: false})
+      ]);
+      const {component} = setup(todos);
+      const label = component.children('label');
+
+      expect(label.type()).to.equal('label');
+      expect(label.text()).to.equal('The number of todos not completed: 5 todos left')
     })
   })
 });
(END)
```

Run the test and watch it fail.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      ✓ Should display '1 todo left' when active count is 1
      1) Should display '5 todos left' when active count is 5

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  42 passing (116ms)
  1 failing

  1) Footer component Should render correctly Should display '5 todos left' when active count is 5:

      AssertionError: expected 'The number of todos not completed: ' to equal 'The number of todos not completed: 5 todos left'
      + expected - actual

      -The number of todos not completed: 
      +The number of todos not completed: 5 todos left

      at Context.<anonymous> (tests/todomvc/components/Footer.spec.js:70:31)
```

Write the code to make the test pass.

```javascript
diff --git a/src/todomvc/components/Footer.js b/src/todomvc/components/Footer.js
index 45431f4..2b54275 100644
--- a/src/todomvc/components/Footer.js
+++ b/src/todomvc/components/Footer.js
@@ -11,7 +11,8 @@ export default class Footer extends Component {
   static countNotCompleted(todos) {
     if (typeof todos === "undefined") return '';
     else if (todos.filter(todo => todo.get('completed') !== true).count() === 0) return 'No todos left';
-    else if (todos.filter(todo => todo.get('completed') !== true).count() === 1) return '1 todo left'
+    else if (todos.filter(todo => todo.get('completed') !== true).count() === 1) return '1 todo left';
+    else return `${todos.filter(todo => todo.get('completed') !== true).count()} todos left`
   }

   render() {
(END)
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      ✓ Should display '1 todo left' when active count is 1
      ✓ Should display '5 todos left' when active count is 5

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  43 passing (111ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m "display '5 todos left' when active count is 5"
```

## MainSection component

### Should render correctly

#### It should include a Footer component

Write the test.

```javascript
diff --git a/tests/todomvc/components/MainSection.spec.js b/tests/todomvc/components/MainSection.spec.js
index d69e408..9ffc1de 100644
--- a/tests/todomvc/components/MainSection.spec.js
+++ b/tests/todomvc/components/MainSection.spec.js
@@ -52,6 +52,13 @@ describe('MainSection component', () => {
         expect(item.type()).to.equal(TodoItem);
         expect(item.props().todo).to.equal(props.todos.get(i))
       })
+    });
+
+    it('Should include a Footer component', () => {
+      const {component} = setup();
+      const footer = component.children('Footer');
+
+      expect(footer).to.have.length(1);
     })
   })
 });
(END)
```

Run the test and watch it fail.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      ✓ Should display '1 todo left' when active count is 1
      ✓ Should display '5 todos left' when active count is 5

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos
      1) Should include a Footer component

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  43 passing (126ms)
  1 failing

  1) MainSection component Should render correctly Should include a Footer component:

      AssertionError: expected { Object (root, unrendered, ...) } to have a length of 1 but got 0
      + expected - actual

      -0
      +1

      at Context.<anonymous> (tests/todomvc/components/MainSection.spec.js:61:30)
```

Write the code to make the test pass.

```javascript
diff --git a/src/todomvc/components/MainSection.js b/src/todomvc/components/MainSection.js
index b4248af..5a40455 100644
--- a/src/todomvc/components/MainSection.js
+++ b/src/todomvc/components/MainSection.js
@@ -4,6 +4,7 @@ import React, {Component} from 'react'
 import PropTypes from 'prop-types'

 import TodoItem from './TodoItem'
+import Footer from "./Footer";

 export default class MainSection extends Component {
   static propTypes = {
@@ -19,6 +20,7 @@ export default class MainSection extends Component {
         <ul>
           {todos.map(todo => <TodoItem key={todo.get('id')} todo={todo} {...actions} />)}
         </ul>
+        <Footer todos={todos}/>
       </section>
     )
   }
(END)
```

Run the test and watch it pass.

```bash
  TodoMVC actions
    ✓ Should create an action to add a todo
    ✓ Should create an action to edit a todo
    ✓ Should create an action to delete a todo
    ✓ Should create an action to toggle a todo between completed and not completed
    ✓ Should create an action to toggle all todos between completed and not completed

  Footer component
    Should render correctly
      ✓ Should be a Footer
      ✓ Should have a todo counter
      ✓ Should display 'No todos left' when active count is 0
      ✓ Should display '1 todo left' when active count is 1
      ✓ Should display '5 todos left' when active count is 5

  Header component
    Should render correctly
      ✓ Should be a Header
      ✓ Should have a title
      ✓ Should have a TodoTextInput field
      ✓ Should have a toggle all complete status checkbox
    Should behave correctly
      ✓ Should call addTodo() if length of text is greater than 0
      ✓ Should call toggleCompleteAllTodos() when the all complete status checkbox is changed

  MainSection component
    Should render correctly
      ✓ Should be a MainSection component
      ✓ Should include a list of todos
      ✓ Should include a Footer component

  TodoApp component
    Should render correctly
      ✓ Should be a TodoApp
      ✓ Should have a header
      ✓ Should have a main section

  TodoItem component
    Should render correctly
      ✓ Should be an li
      ✓ Should have a label
      ✓ Should have a delete button
      ✓ Should have a toggle complete status checkbox
    Should behave correctly
      ✓ Should switch to edit mode when label onDoubleClick is fired
      ✓ Should call editTodo() when TodoTextInput onSave is called
      ✓ Should leave edit mode after TodoTextInput onSave
      ✓ Should call deleteTodo() when the delete button is clicked
      ✓ Should call deleteTodo() when TodoTextInput onSave is called with no text
      ✓ Should call toggleCompleteOneTodo() when the complete status checkbox is changed

  TodoTextInput component
    ✓ Should not call onSave() on blur if isNew
    Should render correctly
      ✓ Should be a TodoTextInput component
    Should behave correctly
      ✓ Should update value on change
      ✓ Should call onSave() on return key press
      ✓ Should reset state on return key press if isNew
      ✓ Should call onSave() on blur if not isNew

  TodoMVC reducer
    ✓ Should handle initial state
    ✓ Should handle ADD todo
    ✓ Should handle EDIT todo
    ✓ Should handle DELETE todo
    ✓ Should handle TOGGLE_COMPLETE_ONE todo
    ✓ Should handle TOGGLE_COMPLETE_ALL todo


  44 passing (109ms)
```

Commit changes.

```bash
$ git add .
$ git commit -m "have a Footer component"
```

## Run It!

Now let's see what this looks like.

Open <http://localhost:4000> in your web browser.

You should immediately see the 'The number of todos not completed: No todos left' message.

![](/files/-LPqjFQFa7D8XItTs6az)

Add a todo and see the message change to 'The number of todos not completed: 1 todo left'.

![](/files/-LPqjFQHPU0ChnH7MgGJ)

Add some more todos and set their completed status. See the message change accordingly.

![](/files/-LPqjFQJkm_PxdZ5fUQf)


---

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```
GET https://hackerati.gitbook.io/react-tutorial/todomvc_app/todos_to_complete.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.