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Scrittura dei Test

Supporto del Framework Testrunner​

@wdio/visual-service è indipendente dal framework di test, il che significa che puoi utilizzarlo con tutti i framework supportati da WebdriverIO come:

All'interno dei tuoi test, puoi salvare screenshot o confrontare lo stato visivo attuale della tua applicazione in test con una baseline. Per questo, il servizio fornisce custom matcher, nonché metodi di controllo:

describe('Mocha Example', () => {
    beforeEach(async () => {
        await browser.url('https://webdriver.io')
    })

    it('using visual matchers to assert against baseline', async () => {
        // Check screen to exactly match with baseline
        await expect(browser).toMatchScreenSnapshot('partialPage')
        // check an element to have a mismatch percentage of 5% with the baseline
        await expect(browser).toMatchScreenSnapshot('partialPage', 5)
        // check an element with options for `saveScreen` command
        await expect(browser).toMatchScreenSnapshot('partialPage', {
            /* some options */
        })

        // Check an element to exactly match with baseline
        await expect($('#element-id')).toMatchElementSnapshot('firstButtonElement')
        // check an element to have a mismatch percentage of 5% with the baseline
        await expect($('#element-id')).toMatchElementSnapshot('firstButtonElement', 5)
        // check an element with options for `saveElement` command
        await expect($('#element-id')).toMatchElementSnapshot('firstButtonElement', {
            /* some options */
        })

        // Check a full page screenshot match with baseline
        await expect(browser).toMatchFullPageSnapshot('fullPage')
        // Check a full page screenshot to have a mismatch percentage of 5% with the baseline
        await expect(browser).toMatchFullPageSnapshot('fullPage', 5)
        // Check a full page screenshot with options for `checkFullPageScreen` command
        await expect(browser).toMatchFullPageSnapshot('fullPage', {
            /* some options */
        })

        // Check a full page screenshot with all tab executions
        await expect(browser).toMatchTabbablePageSnapshot('check-tabbable')
        // Check a full page screenshot to have a mismatch percentage of 5% with the baseline
        await expect(browser).toMatchTabbablePageSnapshot('check-tabbable', 5)
        // Check a full page screenshot with options for `checkTabbablePage` command
        await expect(browser).toMatchTabbablePageSnapshot('check-tabbable', {
            /* some options */
        })
    })

    it('should save some screenshots', async () => {
        // Save a screen
        await browser.saveScreen('examplePage', {
            /* some options */
        })

        // Save an element
        await browser.saveElement(
            await $('#element-id'),
            'firstButtonElement',
            {
                /* some options */
            }
        )

        // Save a full page screenshot
        await browser.saveFullPageScreen('fullPage', {
            /* some options */
        })

        // Save a full page screenshot with all tab executions
        await browser.saveTabbablePage('save-tabbable', {
            /* some options, use the same options as for saveFullPageScreen */
        })
    })

    it('should compare successful with a baseline', async () => {
        // Check a screen
        await expect(
            await browser.checkScreen('examplePage', {
                /* some options */
            })
        ).toEqual(0)

        // Check an element
        await expect(
            await browser.checkElement(
                await $('#element-id'),
                'firstButtonElement',
                {
                    /* some options */
                }
            )
        ).toEqual(0)

        // Check a full page screenshot
        await expect(
            await browser.checkFullPageScreen('fullPage', {
                /* some options */
            })
        ).toEqual(0)

        // Check a full page screenshot with all tab executions
        await expect(
            await browser.checkTabbablePage('check-tabbable', {
                /* some options, use the same options as for checkFullPageScreen */
            })
        ).toEqual(0)
    })
})
IMPORTANTE

Questo servizio fornisce metodi save e check. Se esegui i tuoi test per la prima volta NON DOVRESTI combinare i metodi save e compare, i metodi check creeranno automaticamente un'immagine di baseline per te

#####################################################################################
 INFO:
 Autosaved the image to
 /Users/wswebcreation/sample/baselineFolder/desktop_chrome/examplePage-chrome-latest-1366x768.png
#####################################################################################

Quando hai disabilitato il salvataggio automatico delle immagini di baseline, la Promise verrà rifiutata con il seguente avviso.

#####################################################################################
 Baseline image not found, save the actual image manually to the baseline.
 The image can be found here:
 /Users/wswebcreation/sample/.tmp/actual/desktop_chrome/examplePage-chrome-latest-1366x768.png
#####################################################################################

Questo significa che lo screenshot corrente viene salvato nella cartella actual e devi copiarlo manualmente nella tua baseline. Se istanzi @wdio/visual-service con autoSaveBaseline: true l'immagine verrà salvata automaticamente nella cartella baseline.

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