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Leveraging the complete Ember Toolbelt to improve things for all of us

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Marco Otte-Witte @marcoow

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simplabs.com @simplabs

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How do we identify DOM elements in (acceptance and integration) tests?

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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import { moduleForComponent, test } from 'ember-qunit'; import hbs from 'htmlbars-inline-precompile'; moduleForComponent('blog-post', 'blog post component', { integration: true }); test('it renders', function(assert) { … this.render(hbs`{{blog-post post=post}}`); assert.equal( this.$('h1').text().trim(), 'My awesome post' ); assert.equal( this.$('p').text().trim(), "You won't believe it, …" ); });

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{{! templates/components/blog-post.hbs}} -

{{post.title}}

+

{{post.title}}

{{post.body}}

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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import { moduleForComponent, test } from 'ember-qunit'; import hbs from 'htmlbars-inline-precompile'; moduleForComponent('blog-post', 'blog post component', { integration: true }); test('it renders', function(assert) { … this.render(hbs`{{blog-post post=post}}`); assert.equal( this.$('.js-post-title').text().trim(), 'My awesome post' ); assert.equal( this.$('.js-post-body').text().trim(), "You won't believe it, …" ); });

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{{! templates/components/blog-post.hbs}} -

{{post.title}}

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{{post.title}} -

{{post.body}}

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{{post.body}}

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.js-post-title { font-size: 20px; font-weight: bold; }

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- .js-post-title { + .js-post-header { font-size: 20px; font-weight: bold; } {{! templates/components/blog-post.hbs}} -

{{post.title}}

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{{post.title}}

{{post.body}}

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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import { moduleForComponent, test } from 'ember-qunit'; import hbs from 'htmlbars-inline-precompile'; moduleForComponent('blog-post', 'blog post component', { integration: true }); test('it renders', function(assert) { … this.render(hbs`{{blog-post post=post}}`); assert.equal( this.$('[data-test-post-title]').text().trim(), 'My awesome post' ); assert.equal( this.$('[data-test-post-body]').text().trim(), "You won't believe it, …" ); });

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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ember-test-selectors https://github.com/simplabs/ember-test-selectors

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{{blog-post data-test-post-id=post.id}}

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//app/components/blog-post.js import Ember from 'ember'; export default Ember.Component.extend({ post: null, 'data-test-post-id': Ember.computed.readOnly('post.id'), });

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data-test-* everywhere

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//app/components/blog-post.js import Ember from 'ember'; export default Ember.Component.extend({ post: null, 'data-test-post-id': Ember.computed.readOnly('post.id'), });

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//app/components/blog-post.js import Ember from 'ember'; export default Ember.Component.extend({ post: null });

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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{{blog-post data-test-post}} {{#blog-post data-test-post}} {{/blog-post}}

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{{blog-post}} {{#blog-post}} {{/blog-post}}

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How does it all work?

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» ember install ember-test-selectors

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Thanks

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…there's more

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How does it all work internally?

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//app/components/blog-post.js import Ember from 'ember'; export default Ember.Component.extend({ post: null, 'data-test-post-id': Ember.computed.readOnly('post.id'), });

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/* global Ember */ (function() { var bindDataTestAttributes; Ember.Component.reopen({ init: function() { this._super.apply(this, arguments); if (!bindDataTestAttributes) { bindDataTestAttributes = require( 'ember-test-selectors/utils/bind-data-test-attributes' )['default']; } bindDataTestAttributes(this); } }); })();

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included(app) { this._super.included.apply(this, arguments); … if (!this._stripTestSelectors) { app.import('vendor/ember-test-selectors/patch-component.js'); } }

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//app/components/blog-post.js import Ember from 'ember'; export default Ember.Component.extend({ post: null, 'data-test-post-id': Ember.computed.readOnly('post.id'), });

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included(app) { this._super.included.apply(this, arguments); … if (this._stripTestSelectors) { … if (checker.satisfies('^5.0.0')) { … app.options.babel.plugins.push( require('./strip-data-test-properties-plugin') ); } else if (checker.satisfies('^6.0.0-beta.1')) { … app.options.babel6.plugins.push( require('./strip-data-test-properties-plugin6') ); } } }

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let TEST_SELECTOR_PREFIX = /data-test-.*/; function StripDataTestPropertiesPlugin() { return { visitor: { Property(path) { if (TEST_SELECTOR_PREFIX.test(path.node.key.value)) { path.remove(); } }, }, }; }

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https://astexplorer.net

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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included(app) { _setupPreprocessorRegistry(registry) { if (this._stripTestSelectors) { let StripTestSelectorsTransform = require( './strip-test-selectors' ); registry.add('htmlbars-ast-plugin', { name: 'strip-test-selectors', plugin: StripTestSelectorsTransform, baseDir() { return __dirname; } }); } … } }

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⚠

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StripTestSelectorsTransform.prototype.transform = function(ast) { let walker = new this.syntax.Walker(); walker.visit(ast, function(node) { if (node.type === 'ElementNode') { node.attributes = node.attributes.filter(function(attribute) { return !isTestSelector(attribute.name); }); } else if (node.type === 'MustacheStatement' || node.type === 'BlockStatement') { node.params = node.params.filter(function(param) { return !isTestSelector(param.original); }); node.hash.pairs = node.hash.pairs.filter(function(pair) { return !isTestSelector(pair.key); }); } }); return ast; };

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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{{! templates/components/blog-post.hbs}}

{{post.title}}

{{post.body}}

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StripTestSelectorsTransform.prototype.transform = function(ast) { let walker = new this.syntax.Walker(); walker.visit(ast, function(node) { if (node.type === 'ElementNode') { node.attributes = node.attributes.filter(function(attribute) { return !isTestSelector(attribute.name); }); } else if (node.type === 'MustacheStatement' || node.type === 'BlockStatement') { node.params = node.params.filter(function(param) { return !isTestSelector(param.original); }); node.hash.pairs = node.hash.pairs.filter(function(pair) { return !isTestSelector(pair.key); }); } }); return ast; };

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{{blog-post data-test-post}} {{#blog-post data-test-post}} {{/blog-post}}

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{{blog-post}} {{#blog-post}} {{/blog-post}}

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StripTestSelectorsTransform.prototype.transform = function(ast) { let walker = new this.syntax.Walker(); walker.visit(ast, function(node) { if (node.type === 'ElementNode') { node.attributes = node.attributes.filter(function(attribute) { return !isTestSelector(attribute.name); }); } else if (node.type === 'MustacheStatement' || node.type === 'BlockStatement') { node.params = node.params.filter(function(param) { return !isTestSelector(param.original); }); node.hash.pairs = node.hash.pairs.filter(function(pair) { return !isTestSelector(pair.key); }); } }); return ast; };

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{{blog-post data-test-post=post.id}} {{#blog-post data-test-post=post.id}} {{/blog-post}}

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{{blog-post}} {{#blog-post}} {{/blog-post}}

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https://embermap.com/video/ember-test-selectors

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Thanks

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simplabs.com @simplabs