Testcafe: Screenshots does not work in docker if resized window

[FredrikSeidl]

Are you requesting a feature or reporting a bug?

Reporting a bug

What is the current behavior?

Screenshots fail when trying to take screenshot after a test has resized the window. This only applies to the docker image.

The error thrown is

 Warnings (1):
 --
  Was unable to take a screenshot due to an error.

  Command failed:
  /opt/testcafe/node_modules/testcafe-browser-tools/bin/linux/musl-64/screenshot
  800001
  /tests/screenshot/2017-10-26_01-43-12/test-1/Chrome_59.0.3071_Linux_0.0.0/1.png
  X Error of failed request:  BadMatch (invalid parameter attributes)
    Major opcode of failed request:  73 (X_GetImage)
    Serial number of failed request:  13
    Current serial number in output stream:  13

What is the expected behavior?

A screenshot should be generated

How would you reproduce the current behavior (if this is a bug)?

Run the code below

Provide the test code and the tested page URL (if applicable)

Tested page URL: https://www.google.com

Test code

fixture `Reproduce bug`
    .page `https://www.google.com`;

test('Will fail', async t => {
    await t.resizeWindow(1280,800)
    await t.takeScreenshot()
});

Specify your

• operating system: Mac OS X 10.11.5
• testcafe version: v0.18.1
• node.js version: v6.10.3

[AndreyBelym]

Hello @FredrikSeidl!

I've reproduced the bug, need some time to investigate it, thank you for the feedback, I'm trying to find a workaround now.

[AndreyBelym]

I have found that it happens when Chrome window resized to be bigger that virtual screen size. I can't figure out why but looks like that Chrome doesn't works well with Xvfb in this case. The problem can't be reproduced on a real X11 server.

As a workaround, you can set bigger virtual screen size by passing environment variables SCREEN_WIDTH and SCREEN_HEIGHT to container, e.g.:

docker run -it -e "SCREEN_WIDTH=3840" -e "SCREEN_HEIGHT=2160" -v ~/tests:/tests testcafe/testcafe -s /tests/screenshots 'chromium --no-sandbox' /tests

I think we need to increase default screen size to 1920x1080 and emit descriptive warning or error on resizing if the specified size is bigger than the screen size.

[morph027]

Encountering similar problem while running in Docker within Gitlab CI and already set Xvfb to higher resolution. Still the same errors.

[shaikatz]

I get the same error even without resizingWindow.
Found that if I use maximizeWindow the screenshot will work.

[morph027]

Like already mentioned in #1913 , switching to headless mode also resolved this issue. Not sure if it's really related to this, but now it works.

[neilmatillano]

Also getting same error
_Error of failed request: BadMatch (invalid parameter attributes)_

For failed tests for page with widgets.

[AndreyBelym]

Hi @shaikatz @neilmatillano, could you try to increase Xvfb screen size, and use headless mode?

docker run -it -e "SCREEN_WIDTH=3840" -e "SCREEN_HEIGHT=2160" -v ~/tests:/tests testcafe/testcafe -s /tests/screenshots 'chromium:headless --no-sandbox' /tests

[hauptrolle]

Hi, I get the same error message as mentioned in the first post.
Increasing the screen size, and using headless mode doesn't help.

[AndreyBelym]

This issue must be fixed by https://github.com/DevExpress/testcafe/pull/2492. I'll notify you when a build with the fix will be published on NPM. Feel free to try the fixed build and reopen the issue if the problem isn't solved in your environment.

[lock[bot]]

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