Webdriver.IO收到：“ npm ERR！ 测试失败。 详情请参见上文。”但看不到错误

Question

I've created a simple test which verify that the appearance number of breadcrumbs in a specific site is 2:

The site is: https://theculturetrip.com/europe/united-kingdom/england/london/before-you-go/

The 2 breadcrumbs (in blue circle): breadcrumbs_screenshot

My test: ('[itemprop="item"]' is the breadcrumbs button CSS selector)

it.only('Upper display shows the breadcrumbs', function () {
    let breadcrumbsAppearancesNumber = $$('[itemprop="item"]').length;
    expect(breadcrumbsAppearancesNumber).to.equal(2);
});

And for 2 it works well.

However, just for testing purpose when I insert 3:

it.only('Upper display shows the breadcrumbs', function () {
    let breadcrumbsAppearancesNumber = $$('[itemprop="item"]').length;
    expect(breadcrumbsAppearancesNumber).to.equal(3);
});

It obviously fails, with the output: "npm ERR! Test failed. See above for more details."

However when I scrolling above I don't see any error messages that can give me extra information on why it fails...

It shows:

Stdout:

2019-01-06T11:35:15.971Z INFO wdio-cli:Launcher: Run onPrepare hook

2019-01-06T11:35:19.200Z INFO wdio-local-runner: Start worker 0-0 with arg: --spec=tests/InnerArticleTest.js

[0-0] 2019-01-06T11:35:19.579Z INFO wdio-local-runner: Run worker command: run

[0-0] 2019-01-06T11:35:19.749Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session

[0-0] 2019-01-06T11:35:19.749Z INFO webdriver: DATA { capabilities:

   { alwaysMatch: { browserName: 'chrome' }, firstMatch: [ {} ] },

  desiredCapabilities: { browserName: 'chrome' } }

[0-0] 2019-01-06T11:35:22.427Z INFO webdriver: COMMAND navigateTo("https://theculturetrip.com/europe/united-kingdom/england/london/before-you-go/")

[0-0] 2019-01-06T11:35:22.428Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/url

[0-0] 2019-01-06T11:35:22.428Z INFO webdriver: DATA { url:

   'https://theculturetrip.com/europe/united-kingdom/england/london/before-you-go/' }

[0-0] 2019-01-06T11:35:28.394Z INFO webdriver: COMMAND findElement("css selector", "[class*="LayoutWrapper"]")

[0-0] 2019-01-06T11:35:28.394Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/element

[0-0] 2019-01-06T11:35:28.394Z INFO webdriver: DATA { using: 'css selector', value: '[class*="LayoutWrapper"]' }

[0-0] 2019-01-06T11:35:28.417Z INFO webdriver: RESULT { ELEMENT: '0.5487788910074598-1' }

[0-0] 2019-01-06T11:35:28.439Z INFO webdriver: COMMAND isElementDisplayed("0.5487788910074598-1")

[0-0] 2019-01-06T11:35:28.439Z INFO webdriver: [GET] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/element/0.5487788910074598-1/displayed

[0-0] 2019-01-06T11:35:28.455Z INFO webdriver: RESULT true

[0-0] 2019-01-06T11:35:28.456Z INFO webdriver: COMMAND findElement("css selector", "[class*="_Icon-"]")

[0-0] 2019-01-06T11:35:28.456Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/element

[0-0] 2019-01-06T11:35:28.456Z INFO webdriver: DATA { using: 'css selector', value: '[class*="_Icon-"]' }

[0-0] 2019-01-06T11:35:28.471Z INFO webdriver: RESULT { ELEMENT: '0.5487788910074598-2' }

[0-0] 2019-01-06T11:35:28.473Z INFO webdriver: COMMAND elementClick("0.5487788910074598-2")

[0-0] 2019-01-06T11:35:28.473Z INFO webdriver: COMMAND elementClick("0.5487788910074598-2")

[0-0] 2019-01-06T11:35:28.473Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/element/0.5487788910074598-2/click

[0-0] 2019-01-06T11:35:28.528Z INFO webdriver: COMMAND findElements("css selector", "[itemprop="item"]")

[0-0] 2019-01-06T11:35:28.528Z INFO webdriver: [POST] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592/elements

[0-0] 2019-01-06T11:35:28.528Z INFO webdriver: DATA { using: 'css selector', value: '[itemprop="item"]' }

[0-0] 2019-01-06T11:35:28.543Z INFO webdriver: RESULT [ { ELEMENT: '0.5487788910074598-3' },

  { ELEMENT: '0.5487788910074598-4' } ]

[0-0] 2019-01-06T11:35:28.556Z INFO webdriver: COMMAND deleteSession()

[0-0] 2019-01-06T11:35:28.556Z INFO webdriver: [DELETE] http://127.0.0.1:4444/wd/hub/session/d7e2b630ea4d1841e919ec800890b592

2019-01-06T11:35:28.788Z DEBUG wdio-local-runner: Runner 0-0 finished with exit code 1



Test Suites:     0 passed, 1 failed, 1 total (100% completed)

Time:            🕑  13.05s



npm ERR! Test failed.  See above for more details.

Do you have an idea why?

Thanks a lot!

Answer 1

LE: This is related to a issue ( BUG#2639 ) that will be fixed in WebdriverIO Version 5 ( webdriverio@5.xx ), somewhere in the near future. This behavior affects all sync: true WDIO setups.

To conclude, here's the project lead maintainer's take on the matter:

Just fyi: this will be fixed in v5 where the underlying monad structure is more simplified and will actually work.

If anyone is interested in a fix for this, feel free to propose a PR on the v4 branch. This is most likely fixed in v5.

---

I think that is pretty much custom with the setup you're running, unless you add some fancy reporters for extra verbosity & display swag. Just visit the Reporters section from the Official Guide .

Alternatives:

a.) You can enhance verbosity at the assertion-level, using the optional msg param as so:

expect(breadcrumbsAppearancesNumber, `Found: ${breadcrumbsAppearancesNumber} breadcrumbs | Expected: 3 breadcrumbs`).to.equal(3);

b.) Or, increase the log verbosity ( logLevel: verbose ) in your wdio.conf.js file:

exports.config = {
  // ...
  //
  // Level of logging verbosity: silent | verbose | command | data | result | error
  logLevel: 'verbose',
  //
  // ... 
};