Cannot Find Children When Using Enzyme JS Mount - testing

Question

My expectation is that when I use Enzyme's mount function, I should be able to not only query for nodes in the top level element, but also nodes/elements that are rendered in child components.
Here are the tests exhibited in the matter:
import React from 'react';
import chai from 'chai'
import chaiEnzyme from 'chai-enzyme'
chai.use(chaiEnzyme());
const expect = chai.expect;
import {
shallow,
mount
} from 'enzyme';
class Child extends React.Component {
render() {
return <div id='child'>
CHILD
<button onClick={() => console.log('hit me')}>HIT ME</button>
</div>
}
}
class Parent extends React.Component {
render() {
return <div id='root'>
<Child aprop={1}/>
</div>
}
}
describe('example', function() {
describe('mounted', function() {
it('should find the button', function() {
const wrapper = mount(<Parent/>);
expect(wrapper.find('button').length).to.equal(1);
});
it('should find Child component', function() {
const wrapper = mount(<Parent/>);
console.log(wrapper.debug());
expect(wrapper.find(Child).length).to.equal(1);
});
});
describe('shallow', function() {
it('should not find the button', function() {
const wrapper = shallow(<Parent/>);
expect(wrapper.find('button').length).to.equal(0);
});
it('should find Child component', function() {
const wrapper = shallow(<Parent/>);
expect(wrapper.find(Child).length).to.equal(1);
});
});
});
The output is:
example
mounted
✗ should find the button
expected 0 to equal 1
AssertionError#webpack:///~/assertion-error/index.js?6193**:74:0 <- test/components/mount.spec.js:373:25
assert#webpack:///~/chai/lib/chai/assertion.js?fee1**:107:0 <- test/components/mount.spec.js:4705:32
assertEqual#webpack:///~/chai/lib/chai/core/assertions.js?b343**:487:0 <- test/components/mount.spec.js:5222:19
webpack:///~/chai/lib/chai/utils/addMethod.js?ca90**:41:0 <- test/components/mount.spec.js:4292:31
webpack:///test/components/mount.spec.js:35:53 <- test/components/mount.spec.js:153:54
LOG LOG: '<Parent />'
✗ should find Child component
expected 0 to equal 1
AssertionError#webpack:///~/assertion-error/index.js?6193**:74:0 <- test/components/mount.spec.js:373:25
assert#webpack:///~/chai/lib/chai/assertion.js?fee1**:107:0 <- test/components/mount.spec.js:4705:32
assertEqual#webpack:///~/chai/lib/chai/core/assertions.js?b343**:487:0 <- test/components/mount.spec.js:5222:19
webpack:///~/chai/lib/chai/utils/addMethod.js?ca90**:41:0 <- test/components/mount.spec.js:4292:31
webpack:///test/components/mount.spec.js:41:50 <- test/components/mount.spec.js:159:51
shallow
✓ should not find the button
✓ should find Child component
Either mount is not working as expected, or my understanding isn't correct.
Here is my Karma/Webpack file if it helps:
const webpack = require('webpack');
var argv = require('yargs').argv;
var path = require('path');
let srcPath = path.join(__dirname, '/../src/');
const webpackConfig = {
devtool: 'inline-source-map',
resolve: {
// allow us to import components in tests like:
// import Example from 'components/Example';
root: path.resolve(__dirname, './src'),
// allow us to avoid including extension name
extensions: ['', '.js', '.jsx', '.css', '.scss', '.json'],
// required for enzyme to work properly
alias: {
'sinon': 'sinon/pkg/sinon',
}
},
module: {
// don't run babel-loader through the sinon module
noParse: [
/node_modules\/sinon\//
],
isparta: {
embedSource: true,
noAutoWrap: true,
// these babel options will be passed only to isparta and not to babel-loader
babel: {
presets: ['es2015', 'stage-0', 'react']
}
},
// run babel loader for our tests
loaders: [
{
test: /\.(js|jsx)$/,
loader: 'babel',
exclude: path.resolve(__dirname, 'node_modules'),
query: {
plugins: ['transform-decorators-legacy'],
presets: ['es2015', 'airbnb', 'stage-1', 'react']
}
},
{
test: /\.json$/, loader: 'json'
},
{
test: /\.scss$/,
exclude: /[\/\\](node_modules|bower_components|public)[\/\\]/,
loaders: [
'style?sourceMap',
'css?modules&importLoaders=1&localIdentName=[local]',
'postcss',
'sass'
]
},
{
test: /\.css$/,
exclude: /[\/\\](node_modules|bower_components|public)[\/\\]/,
loaders: [
'style?sourceMap',
'css?modules&importLoaders=1&localIdentName=[local]'
]
}
],
preLoaders: [ { //delays coverage til after tests are run, fixing transpiled source coverage error
test: /\.(jsx|js)$/,
include: path.resolve('src/'),
loader: 'isparta',
} ]
},
plugins: [
new webpack.IgnorePlugin(/node-fetch/)
],
// required for enzyme to work properly
externals: {
'jsdom': 'window',
'react/lib/ExecutionEnvironment': true,
'react/lib/ReactContext': 'window',
'react/addons': true
},
};
module.exports = function(config) {
config.set({
browsers: ['PhantomJS'],
singleRun: !argv.watch,
frameworks: ['mocha', 'chai'],
reporters: ['spec', 'coverage'],
// include some polyfills for babel and phantomjs
files: [
'node_modules/whatwg-fetch/fetch.js',
'node_modules/babel-polyfill/dist/polyfill.js',
'./node_modules/phantomjs-polyfill/bind-polyfill.js',
'test/**/*.js'
],
preprocessors: {
// add webpack as preprocessor
'src/**/*.js': ['webpack', 'sourcemap'],
'test/**/*.js': ['webpack', 'sourcemap']
},
// A lot of people will reuse the same webpack config that they use
// in development for karma but remove any production plugins like UglifyJS etc.
// I chose to just re-write the config so readers can see what it needs to have
webpack: webpackConfig,
webpackMiddleware: {
noInfo: true
},
coverageReporter: {
dir: 'coverage/',
reporters: [
{ type: 'html' },
{ type: 'text' }
]
},
// tell karma all the plugins we're going to be using to prevent warnings
plugins: [
'karma-mocha',
'karma-chai',
'karma-webpack',
'karma-phantomjs-launcher',
'karma-spec-reporter',
'karma-sourcemap-loader',
'karma-coverage'
]
});
};