#Jest angular emit keyup event on key how to
#Jest angular emit keyup event on key install

We'll mock send and setConfig properties as well, just to be sure every condition is tested properly.

You can use Angular event bindings to respond to any DOM event.

#Jest angular emit keyup event on key how to

This page explains how to bind those events to component event handlers using the Angular event binding syntax.

It will also enable us to subscribe callback functions using on method. User actions such as clicking a link, pushing a button, and entering text raise DOM events. For example, a lowercase 'a' will be reported as 65 by keydown and keyup, but as 97 by keypress. The keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered. The following code will produce a mocked 'module' which allows us to emit events on command. The keyup event is fired when a key is released. In order to improve the results, we'll have to dive into mocking analytics module with Jest.

#Jest angular emit keyup event on key install

We need two extra plugins to get this working: npm install -D babel/preset-env babel/preset-typescript. For Jest to work in a TypeScript project we need some additional settings on top of the default Babel installation. Time : 0.314 s, estimated 1 s Advanced test with module mocking First step is to install Jest for Angular: npm install -D jest types/jest jest-preset-angular. do not produce a character, therefore they have no ‘keypress’ event attached to them. It will also enable us to subscribe callback functions using on method. The following code will produce a mocked 'module' which allows us to emit events on command. They key and code fields are a native part of the browser keyboard event object. You can specify the key or code that you would like to bind to keyboard events. Modifier keys such as ‘Shift’, ‘CapsLock’, ‘Ctrl’ etc. In order to improve the results, we'll have to dive into mocking analytics module with Jest. You can bind to keyboard events using Angular's binding syntax. These include keys such as the alphabetic, numeric, and punctuation keys. | - | - | - | - | -įile | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s keypress Event: This event occurs when the user presses a key that produces a character value. ✓ should ensure component renders without a crash