fixing up docs

docs/step2-04/README.md

@@ -14,6 +14,8 @@ https://jestjs.io/
 
 # Demo
 
+## jest basics
+
 In this repo, we can start an inner loop development of tests with the command: `npm test`
 
 Take a look at code inside `demo/src`:
@@ -24,10 +26,43 @@ Take a look at code inside `demo/src`:
 
 3. `index.spec.ts` is the test file: note how tests are re-run on save to test file changes as well as source code changes under `src`
 
+## testing React applications
+
+You can also test React Components with `jest` with the help of a partner library called `enzyme`. Take a look at the test below:
+
+```ts
+import { mount } from 'enzyme';
+
+describe('Foo Component Tests', () => {
+  it('allows us to set props', () => {
+    const wrapper = mount(<Foo bar="baz" />);
+    expect(wrapper.props().bar).toBe('baz');
+    wrapper.setProps({ bar: 'foo' });
+    expect(wrapper.props().bar).toBe('foo');
+  });
+});
+```
+
+`mount` does a full mount of the component. You can use the `enzyme` wrapper to simulate clicks, etc:
+
+```ts
+wrapper.find('button').simulate('click');
+```
+
 # Exercise
 
+## Basic Testing
+
 1. Run the tests by running `npm test` at the root of the bootcamp project
 
 2. Look at the `stack.ts` for a sample implementation of a stack
 
 3. Follow the instructions inside the `stack.spec.ts` file to complete the two tests
+
+## Enzyme Testing
+
+1. Open up `exercise/src/TestMe.spec.tsx`
+
+2. Fill in the blank for the missing test using `enzyme` concepts introduced from the demo
+
+3. Run tests with `npm test`

docs/step2-04/demo/src/TestMe.spec.tsx

@@ -0,0 +1,11 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import { TestMe } from './TestMe';
+
+describe('TestMe Component', () => {
+  it('should have a non-clickable component when the origina InnerMe is clicked', () => {
+    const wrapper = mount(<TestMe name="world" />);
+    wrapper.find('#innerMe').simulate('click');
+    expect(wrapper.find('#innerMe').text()).toBe('Clicked');
+  });
+});

docs/step2-04/demo/src/TestMe.tsx

@@ -0,0 +1,37 @@
+import React from 'react';
+
+export interface TestMeProps {
+  name: string;
+}
+
+export interface TestMeState {
+  clicked: boolean;
+}
+
+export const TestMe = (props: TestMeProps) => {
+  return (
+    <div id="testMe">
+      <InnerMe name={props.name} />
+    </div>
+  );
+};
+
+export class InnerMe extends React.Component<TestMeProps, TestMeState> {
+  state = {
+    clicked: false
+  };
+
+  onClick = () => {
+    this.setState({ clicked: true });
+  };
+
+  render() {
+    return !this.state.clicked ? (
+      <div onClick={this.onClick} id="innerMe">
+        Hello {this.props.name}, Click Me
+      </div>
+    ) : (
+      <div id="innerMe">Clicked</div>
+    );
+  }
+}

docs/step2-04/demo/step2-04/demo.js

@@ -1,2 +1,2 @@
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+!function(n){var e={};function t(r){if(e[r])return e[r].exports;var u=e[r]={i:r,l:!1,exports:{}};return n[r].call(u.exports,u,u.exports,t),u.l=!0,u.exports}t.m=n,t.c=e,t.d=function(n,e,r){t.o(n,e)||Object.defineProperty(n,e,{enumerable:!0,get:r})},t.r=function(n){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(n,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(n,"__esModule",{value:!0})},t.t=function(n,e){if(1&e&&(n=t(n)),8&e)return n;if(4&e&&"object"==typeof n&&n&&n.__esModule)return n;var r=Object.create(null);if(t.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:n}),2&e&&"string"!=typeof n)for(var u in n)t.d(r,u,function(e){return n[e]}.bind(null,u));return r},t.n=function(n){var e=n&&n.__esModule?function(){return n.default}:function(){return n};return t.d(e,"a",e),e},t.o=function(n,e){return Object.prototype.hasOwnProperty.call(n,e)},t.p="",t(t.s=149)}({149:function(n,e,t){"use strict";t.r(e),t.d(e,"getCount",function(){return u}),t.d(e,"increment",function(){return o}),t.d(e,"decrement",function(){return i}),t.d(e,"square",function(){return f});var r=0;function u(){return r}function o(){return++r}function i(){return--r}function f(n){return function(n,e){return n*e}(n,n)}}});
 //# sourceMappingURL=demo.js.map