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69 lines
1.9 KiB
Markdown
69 lines
1.9 KiB
Markdown
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## Automatic testing
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Automatic tests go in the `test/` subfolder of your component's directory. They will be found and run by
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“web-test-runner”.
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Tests are written using
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* Mocha (https://mochajs.org/) & Chai Assertion Library (https://www.chaijs.com/api/assert/)
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* Playwright (https://playwright.dev/docs/intro) runs the tests in actual browsers.
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Here's a simple example:
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```ts
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/**
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* Test file for Etemplate webComponent Textbox
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*/
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import {assert, fixture, html} from '@open-wc/testing';
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import {Et2Textbox} from "../Et2Textbox";
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import {inputBasicTests} from "../../Et2InputWidget/test/InputBasicTests";
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// Reference to component under test
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let element : Et2Textbox;
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async function before()
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{
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// Create an element to test with, and wait until it's ready
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element = await fixture<Et2Textbox>(html`
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<et2-textbox></et2-textbox>
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`);
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return element;
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}
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describe("Textbox widget", () =>
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{
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// Setup run before each test
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beforeEach(before);
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it('is defined', () =>
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{
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assert.instanceOf(element, Et2Textbox);
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});
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it('has a label', () =>
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{
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element.set_label("Yay label");
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assert.isEmpty(element.shadowRoot.querySelectorAll('.et2_label'));
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})
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});
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// Run some common, basic tests for inputs (readonly, value, etc.)
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inputBasicTests(before, "I'm a good test value", "input");
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```
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This verifies that the component can be loaded and created. `inputBasicTests()` checks readonly and in/out values.
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### What to test
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#### Can the component be loaded and created?
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Quite often components get accidental dependencies that complicate things, but sometimes they just break.
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#### Value in = value out
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Many of our components do correction and coercion on bad data or invalid values, but you should test that values out
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match
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the values going in. How to do this, and what to do with bad values, depends on the component.
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### Test tips
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* Always use `this.egw()`. It can be easily stubbed for your test. Global `egw` cannot.
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