How to make tests more resilient

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Story time

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Release Time!

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Disaster!

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The business’ footprint

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Gregor Woiwode @GregOnNet [email protected] Softwarearchitekt co-IT.eu GmbH

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Test Internal External API API Platform False-Positives Requirements

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Test Internal External API API Platform False-Positives Requirements

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How can we make tests more resilient?

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1. Resiliency Process 2. Unit-Test Level 3. UI-Test Level

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Run test case Identify resilience problems Identify resilience parameters Apply resilience parameters © IBM 2014

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Adapter

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Application Library

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Application Library with

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ttttttttt Application Library with

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ttttttttt Application Library with

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Application Library with brand new Library Are the tests still working?

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Application Library with … using Adapter abstract your library

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Applicationwith Library … using Adapter

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Applicationwith Library … using Adapter

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Applicationwith Library … using Adapter

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Example

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date-fns const yesterday = subDays(new Date(), 1); const tomorrow = addDays(new Date(), 1); moment.js const yesterday = moment().subtract(1, 'days').toDate(); const tomorrow = moment().add(1, 'days').toDate();

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export class TimeKeeper { get yesterday() { return moment().subtract(1, 'days').toDate(); } get tomorrow() { return moment().add(1, 'days').toDate(); } } moment.js

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export class TimeKeeper { get yesterday() { return subDays(new Date(), 1); } get tomorrow() { return addDays(new Date(), 1); } } date-fns

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Adapter Benefits Saves time - One place of maintenance Stabilises In-App-API Simpliﬁes faking

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Isolated UI Tests

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Template Level "" Application Level

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Save" cy.get(‘.btn’) .should('exist');

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Save" Cancel" cy.get(‘.btn’) .first() .should('exist');

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Cancel" Save" cy.get(‘.btn’) .first() .should('exist');

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Save" cy.get(‘.btn’) .should('exist');

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Save" cy .get(‘[data-testid=view"__btn—save]’ ) .should('exist');

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Save" Cancel" cy .get(‘[data-testid=view"__btn—save]’ ) .should('exist');

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Application Level

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Application /overview Testing a feature rich component

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Application /overview Interact with data grid

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Application /overview New requirement overlay

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Application /products/reports/overview Clickable area is not reachable /overview

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Application /products/reports/overview Component is moved in the app.

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UI is fluent Widgets block test targets Test targets move

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Application /products/reports/overview /overview

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Application /products/reports/overview /overview Sandbox

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Write a story about your component

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export const primary = () "=> ({ }); Conﬁgure a story

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export const primary = () "=> ({ "/* ""... "*/ component: DataGridComponent, }); Specify you UI component

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export const primary = () "=> ({ "/* ""... "*/ component: DataGridComponent, props: { displayedColumns: ['position', 'name', 'weight', 'symbol'], dataSource: new MatTableDataSource([ { position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H' }, { position: 2, name: 'Helium', weight: 4.0026, symbol: 'He' }, { position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li' } ]), }, }); Provide some test data

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describe('common-ui', () "=> { beforeEach(() "=> cy.visit('/iframe.html?id=datagridcomponent"--primary')); it('should sort by number', () "=> { cy.get('[data-testid=data-grid"__header"--number]').click(); cy.get('[data-testid=data-grid"__header"--number]').click(); cy.get('[data-testid=data-grid"__header"--number-value]') .first() .should('contain', 10); }); }); Write an UI test for your component

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nx.dev conﬁgures & runs

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Example

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Isolated UI Benefits Lower complexity of UI tests Focus on speciﬁc UI parts Get rid of side effects that break tests

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Summary Clariﬁed the why of test stability Learned about test resiliency process Adapter pattern stabilises Unit Tests Isolated UI Tests stabilise e2e Tests

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Gregor Woiwode @GregOnNet [email protected] Softwarearchitekt co-IT.eu GmbH Zeit für Ihre Fragen…

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Photo by Alex Wigan on Unsplash Photo by Chris Montgomery on Unsplash Photo by Bruno Martins on Unsplash Photo by Luke Stackpoole on Unsplash Photo by Steve Johnson on Unsplash Photo by Sigmund on Unsplash Image sources Photo by David Boca on Unsplash

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Content Sources https://usersnap.com/blog/resilience-testing/ https://www.ibm.com/developerworks/websphere/techjournal/1407_col_nasser/1407_col_nasser.html https://kentcdodds.com/blog/making-your-ui-tests-resilient-to-change https://cypress.ui https://storybook.js.org https://nx.dev