NPM modules

Modules "fs", "path" and "os" exposed with the corresponding variables.

const title = ( await bs.page.title() ) + os.version();

Puppeteer methods

• bs - object representing browsing session

  • browser - instance of Browser, which is being created in test setup with configuration provided in Puppetry app

  • page - instance of Page (alias of bs.browser.page)

  • performance

    • resources - array with network activity logs

  • getGaTracking - log of Google Analytics beacons

  • getTarget - get target by name

  • getTargetOrFalse - the same as previous, but when target is not available in the DOM return false instead of throwing exception

  • target(element: ElementHandle) - helpers

    • getProp(prop: string): Promise<string> - obtain element property value

    • getAttr(attr: string): Promise<string> - obtain element attribute value

    • isVisible(): Promise<boolean> - find out f element visible

    • select(value: string): Promise<void> - set a value on select element

Examples:

// Navigating to "https://dsheiko.github.io/react-html5-form/"
  await bs.page.goto( "https://dsheiko.github.io/react-html5-form/", {
    timeout: 30000,
    waitUntil: "load"
  });
  
  const title = await bs.page.title();

Working with targets

Assuming we have targets SUBMIT_BTN, EMAIL_INPUT defined with Puppetry app

// Emulating mouse click
await ( await bs.getTarget( "SUBMIT_BTN" ) ).click();   
// Emulating user input
await ( await bs.getTarget( "EMAIL_INPUT" ) ).type( "[email protected]" );
// Obtaining "name" attribute's value of EMAIL_INPUT 
const name = await bs.target( await bs.getTarget( "EMAIL_INPUT" ) ).getAttr( "name" );       

Jest tools

Please find available API in official documentation of Jest framework. Most demanded tool for the context is expect. In the scope of the test it is extended with the following methods:

• expect( result )

  • toBeOk( expectedValue, assertionSource) - assert the received value is truthy

  • toBeEqual( expectedValue, assertionSource) - assert the received value equals expected one

  • toIncludeSubstring(expectedSubstring, assertionSource) - assert the received string contains expected one

  • toPassCondition(operator, valueToCompare, assertionSource) - assert the received value satisfies a given Puppetry condition

  • toMatchBoundingBoxSnapshot(snapshot, assertionSource) - assert the received bounding box matches a given snapshot

  • toMatchPosition(position, target, counterpart, assertionSource) - assert the received position object matches a given one

Examples:

// Asserting that page HTML satisfies the given constraint
result = await bs.page.content();       
expect( result ).toIncludeSubstring( "demo", "page.assertContent" );
​
// Asserting that window scroll offset satisfies the given constraint
result = await ( await bs.page.evaluate( () => window.scrollX ) );       
expect( result ).toPassCondition( "lt", 10000, "page.assertScroll" );
​
// Asserting that EMAIL_INPUT element is visible
result = await bs.target( await EMAIL_INPUT() ).isVisible();       
expect( result ).toBeOk( "EMAIL_INPUT.assertVisible" );
​
// Asserting that the bounding box of the element satisfies the given constraint
result = await ( await SUBMIT_BTN() ).boundingBox();    
expect( result ).toMatchBoundingBoxSnapshot( {
       "xOperator": "gt",
       "xValue": 0,
       "yOperator": "gt",
       "yValue": 0,
       "wOperator": "gt",
       "wValue": 0,
       "hOperator": "gt",
       "hValue": 0
     }, "SUBMIT_BTN.assertBoundingBox" );
​
 // Asserting that the bounding box of the element satisfies the given constraint
result = {
        target: await ( await DAY_SELECT() ).boundingBox(),
        counterpart: await ( await MONTH_SELECT() ).boundingBox()
      };       
expect( result ).toMatchPosition( "left", "DAY_SELECT", "MONTH_SELECT", "DAY_SELECT.assertPosition" );

Helpers

Helpers are functions available in specification (suite) scope

• util

  • png - build screenshot option

  • pollForValue - poll for value (used by page.assignVarRemotely)

  • exp - template expressions functions

  • bytesToString - translates size into human-readable string

  • generateTmpUploadFile - creates a file in temporary directory by given name and size

• fetch - Node.js-implementation of window.fetch

• localStorage - Node.js-implementation of localStorage

png( id, parentId, screenshotTitle, options ): Object - build screenshot options

Example:

await bs.page.screenshot( util.png( "id", "id", "Just for test", {
  "fullPage":true
}));

This command saves screenshot in ./screenshots/All--available--methods/Just-for-test.png given that test title is All available methods

Node.js

In the test scope one can access Node.js modules.