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Merge branch '3-assertions' into 4-page-objects

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tutorial
- 3-assertions.md
- images
  - inspect-result-links.png

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`‎tutorial/3-assertions.md‎`

Lines changed: 10 additions & 11 deletions

Original file line number	Diff line number	Diff line change
`@@ -99,10 +99,9 @@ Here's the inspection panel for result links:`
`99`	`99`
`100`	`100`	`![Inspecting the result link elements](images/inspect-result-links.png)`
`101`	`101`
`102`		-Result links are `a` elements with the class `result__a`.
`103`		-They are under `h2` elements with the class `result__title`.
`104`		-We could use the selector `.result__title a.result__a` to identify all result links on the page.
`105`		`-(If you look in the DevTools search bar, you'll see that this selector locates 10 elements.)`
	`102`	+Result links are `a` elements with a `data-testid` attribute set to `"result-title-a"`.
	`103`	+We could use the CSS selector `a[data-testid="result-title-a"]` to identify all result links on the page.
	`104`	`+(If you look in the DevTools search bar, you'll see that this selector locates 12 elements.)`
`106`	`105`
`107`	`106`	`Since we can get all elements with one selector,`
`108`	`107`	`we can take the following steps to verify that search result links pertain to the phrase:`
`@@ -121,7 +120,7 @@ Explicit waiting will be tricky.`
`121`	`120`	`Add the following line to the test:`
`122`	`121`
`123`	`122`	```python
`124`		`- page.locator('.result__title a.result__a').nth(4).wait_for()`
	`123`	`+ page.locator('a[data-testid="result-title-a"]').nth(4).wait_for()`
`125`	`124`	```
`126`	`125`
`127`	`126`	`Let's break this down:`
`@@ -130,7 +129,7 @@ Let's break this down:`
`130`	`129`	[`Locator`](https://playwright.dev/python/docs/api/class-locator) object for the target element.
`131`	`130`	A `Locator` object can make many of the same calls as a page, like clicking and getting text.
`132`	`131`	`However, it can also make calls for explicit waiting and calls that target multiple elements.`
`133`		-2. `.result__title a.result__a` is the selector for the result links.
	`132`	+2. `a[data-testid="result-title-a"]` is the selector for the result links.
`134`	`133`	3. `nth(4)` is an [N-th element](https://playwright.dev/python/docs/api/class-locator#locator-nth) fetcher.
`135`	`134`	`N-th element fetchers are zero-indexed and may be appended to any selector.`
`136`	`135`	`In this call, it will fetch the fifth result link element.`
`@@ -145,7 +144,7 @@ Waiting for five links to appear should be good enough for our testing purposes.`
`145`	`144`	`After the links appear, we can scrape their text contents like this:`
`146`	`145`
`147`	`146`	```python
`148`		`- titles = page.locator('.result__title a.result__a').all_text_contents()`
	`147`	`+ titles = page.locator('a[data-testid="result-title-a"]').all_text_contents()`
`149`	`148`	```
`150`	`149`
`151`	`150`	Again, we must use the `locator` method because we want to target a list of elements instead of one.
`@@ -194,8 +193,8 @@ def test_basic_duckduckgo_search(page: Page) -> None:`
`194`	`193`	`expect(page.locator('#search_form_input')).to_have_value('panda')`
`195`	`194`
`196`	`195`	`# And the search result links pertain to the phrase`
`197`		`- page.locator('.result__title a.result__a').nth(4).wait_for()`
`198`		`- titles = page.locator('.result__title a.result__a').all_text_contents()`
	`196`	`+ page.locator('a[data-testid="result-title-a"]').nth(4).wait_for()`
	`197`	`+ titles = page.locator('a[data-testid="result-title-a"]').all_text_contents()`
`199`	`198`	`matches = [t for t in titles if 'panda' in t.lower()]`
`200`	`199`	`assert len(matches) > 0`
`201`	`200`
`@@ -245,8 +244,8 @@ def test_basic_duckduckgo_search(page: Page) -> None:`
`245`	`244`	`expect(page.locator('#search_form_input')).to_have_value('panda')`
`246`	`245`
`247`	`246`	`# And the search result links pertain to the phrase`
`248`		`- page.locator('.result__title a.result__a').nth(4).wait_for()`
`249`		`- titles = page.locator('.result__title a.result__a').all_text_contents()`
	`247`	`+ page.locator('a[data-testid="result-title-a"]').nth(4).wait_for()`
	`248`	`+ titles = page.locator('a[data-testid="result-title-a"]').all_text_contents()`
`250`	`249`	`matches = [t for t in titles if 'panda' in t.lower()]`
`251`	`250`	`assert len(matches) > 0`
`252`	`251`

`‎tutorial/images/inspect-result-links.png‎`

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`‎tutorial/3-assertions.md‎`

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